JEGS Tech Specialist

Pete Mitchell

What Is A Truck Decoder and What Does A Truck Decoder Do?

A truck VIN decoder helps identify important information about a vehicle using its Vehicle Identification Number (VIN). Depending on the model year, a GM truck VIN can reveal details such as the manufacturer, assembly plant, model year, engine type, body style, GVWR classification, and production sequence.

Chevrolet and GMC truck VIN formats have changed significantly over the decades. Early trucks used simple serial number systems, while modern vehicles use the standardized 17-character VIN format adopted in 1981. Because VIN structures vary by production year, decoding a truck VIN requires understanding the format used during that specific era.

This guide explains how Chevrolet and GMC truck VINs evolved from the post-war Advance Design trucks of the late 1940s through today's Silverado, Sierra, Tahoe, Yukon, and other GM truck and SUV models. Use the information below to locate your VIN, understand what each character means, and decode it according to its model year.

Understanding The Parts Of A GM Truck VIN

The Vehicle Identification Number (VIN) on your Chevrolet or GMC truck is a unique 17-character code that provides information about the vehicle's manufacturer, body style, engine, model year, assembly plant, and production sequence.

The following VIN structure applies to 1981 and newer GM trucks that use the standardized 17-character VIN format:

1. World Manufacturer Identifier (WMI)

Characters 1-3 identify the vehicle's manufacturer and country of origin. Chevrolet and GMC truck WMIs typically begin with 1, 2, or 3 (United States, Canada, or Mexico), followed by G for General Motors and additional characters that identify the vehicle division, vehicle type, and manufacturing source.

2. Vehicle Descriptor Section (VDS)

Characters 4-8 identify vehicle attributes such as body style, series, GVWR classification, engine type, drivetrain, and restraint system. The exact meaning varies by model year and vehicle line.

3. Check Digit

Character 9 is a mathematically generated check digit used to verify the validity of the VIN.

4. Model Year

Character 10 identifies the model year. Model year codes repeat on a cycle. Examples include B = 1981, N = 1992, E = 2014, and T = 2026.

5. Assembly Plant

Character 11 identifies the assembly plant where the vehicle was built. Plant codes vary by manufacturer, model year, vehicle line, and production facility.

6. Production Number

Characters 12-17 form the vehicle's sequential production number, which uniquely identifies the vehicle within its production run.

Where Can You Find Your GM Truck VIN?

Locating your GM truck's VIN or serial number depends on the model year. Modern Chevrolet and GMC trucks typically use the standardized 17-character VIN introduced in 1981, while older trucks may use a serial number plate in a different location.

Common VIN and serial number locations include the following:

• Driver's Side Dashboard (1981-Present): Most modern Chevrolet and GMC trucks have a VIN plate visible through the windshield on the driver's side dashboard.
• Driver's Side Door Jamb or Door Frame: Many trucks have a VIN label, certification label, or serial number plate attached to the driver's side door jamb, door frame, or door edge.
• Glove Box, Cowl, or Door Pillar (Older Models): Depending on the year and model, older Chevrolet and GMC trucks may use a serial number plate mounted on the cowl, door pillar, hinge pillar, or inside the glove box area.
• Vehicle Title, Registration, and Insurance Documents: The VIN is typically listed on your title, registration, insurance card, and other ownership documents.
• Engine Compartment: Some older trucks may have a VIN or serial number plate attached to the firewall, radiator support, or another location within the engine compartment.

Tip: If you're working with a classic Chevrolet or GMC truck built before 1981, use the model year guide below to determine whether your vehicle uses a serial number format or a standardized VIN.

GM Truck VIN Decoder Examples

Chevrolet and GMC truck VINs have changed significantly over the years. Early trucks used simple serial numbers that identified the model, assembly plant, and production sequence. As trucks became more sophisticated, VINs evolved to include information such as engine type, body style, GVWR, safety equipment, manufacturing location, and model year.

One of the most important milestones occurred in 1981, when the automotive industry adopted the standardized 17-character VIN format still used today. Because VIN formats varied before standardization, the meaning of each character depends heavily on the truck's model year.

Use the guide below to locate your truck's model year range and decode the VIN according to the format used during that period.

Quick VIN Format Reference

Tip: If you're unsure where to find your VIN, most Chevrolet and GMC trucks have the VIN located on the driver's side dashboard, driver's door jamb, title, registration, or insurance documents.

The following sections explain how Chevrolet and GMC truck VINs were structured during each production era.

1947-1952 VIN Decoding

1947-1952 Chevrolet Truck Serial Numbers

• Assembly Plant Code = First one or two digits. Common plant codes include 1 = Flint, MI; 2 = Tarrytown, NY; 3 = St. Louis, MO; 5 = Kansas City, MO; 6 = Oakland, CA; 8 = Atlanta, GA; 9 = Norwood, OH; 14 = Baltimore, MD; 20 = Los Angeles, CA; and 21 = Janesville, WI.
• Model Year Code = The letter following the assembly plant code, with E = 1947, F = 1948, G = 1949, H = 1950, J = 1951, and K = 1952.
• Series Code = The letter or letters following the model year code. Common Chevrolet truck codes include P = 3100 1/2-ton with 116-inch wheelbase, R = 3600 3/4-ton with 125-inch wheelbase, and S = 3800 1-ton with 137-inch wheelbase. Additional series codes may appear depending on model, GVW rating, wheelbase, and body configuration.
• Build Month Code = The letter following the series code, with A = January, B = February, C = March, D = April, E = May, F = June, G = July, H = August, I = September, J = October, K = November, and L = December.
• Sequential Production Number = The remaining digits identify the sequential production number at the assembly plant. Production numbers were typically assigned by series at each plant and often began near 1001, though numbering practices could vary by year and application.

Note: 1947-1952 Chevrolet truck serial numbers are not standardized 17-character VINs. Plant codes may be one or two digits, and some heavy-duty or special-body applications may use additional series characters. Chevrolet and GMC trucks from this period used different serial number formats, so GMC trucks should be verified using GMC-specific documentation.

1953-1959 VIN Decoding

1953-1955 First Series Chevrolet Truck VINs

• First Digit = Series. Common Chevrolet truck series codes include H = 3100, J = 3600, and L = 3800. Additional series codes may appear depending on model and application.
• Second Digit = Model Year, with 3 = 1953, 4 = 1954, and 5 = 1955 First Series.
• Third Digit = Assembly Plant. Common plant codes include A = Atlanta, GA; B = Baltimore, MD; F = Flint, MI; J = Janesville, WI; K = Kansas City, MO; L = Los Angeles, CA; N = Norwood, OH; O = Oakland, CA; P = Pontiac, MI; S = St. Louis, MO; T = Tarrytown, NY; and W = Willow Run, MI.
• Fourth Through Ninth Digits = Sequential Serial Number at Assembly Plant.

1955 Second Series-1959 Chevrolet Truck VINs

• First Digit = Series. Common Chevrolet pickup codes include D = 1500, H = 3100, M = 3200, J = 3600, and L = 3800. Additional series codes may appear depending on model, GVW rating, and application.
• Second Digit = 1955 Second Series Indicator, used on 1955 Second Series trucks only.
• Third and Fourth Digits = Model Year, with 55 = 1955, 56 = 1956, 57 = 1957, 58 = 1958, and 59 = 1959.
• Fifth Digit = Assembly Plant. Common Chevrolet truck plant codes include A = Atlanta, GA; B = Baltimore, MD; F = Flint, MI; J = Janesville, WI; K = Kansas City, MO; L = Los Angeles, CA; N = Norwood, OH; O = Oakland, CA; S = St. Louis, MO; T = Tarrytown, NY; and W = Willow Run, MI.
• Sixth Through Ninth Digits = Sequential Serial Number at Assembly Plant.

Engine Prefix Note: Some 1955-1959 VIN references show an engine prefix before the series code, with a blank space indicating a standard 6-cylinder engine and V indicating a V8 engine. Because format details vary between 1953-1955 First Series and 1955 Second Series-1959 trucks, verify unusual VINs using factory documentation or a year-specific VIN reference.

GMC Note: Chevrolet and GMC trucks from this period used different serial number formats. GMC VINs should be verified using GMC-specific documentation.

1960-1966 VIN Decoding

1960-1964 Chevrolet Truck VINs

• First Digit = Model Year, with 0 = 1960, 1 = 1961, 2 = 1962, 3 = 1963, and 4 = 1964.
• Second Digit = Vehicle Type. Common pickup codes include C = 2-wheel drive conventional cab and K = 4-wheel drive. Other Chevrolet truck vehicle-type codes may appear on forward-control, school bus, tilt-cab, diesel, tandem-axle, and commercial applications.
• Third and Fourth Digits = Series Designation. Common pickup codes include 14 = 1/2-ton short bed with 115-inch wheelbase, 15 = 1/2-ton long bed with 127-inch wheelbase, and 25 = 3/4-ton long bed with 127-inch wheelbase. Other series codes may appear depending on GVW rating, wheelbase, and body configuration.
• Fifth Digit = Model Type. Common Chevrolet truck codes include 2 = flat-face cowl/chassis cowl, 3 = cab and chassis, 4 = cab and pickup box, 5 = panel body, 6 = Suburban body, and 9 = cab/platform/stake rack.
• Sixth Digit = Assembly Plant. Common plant codes include A = Atlanta, GA; B = Baltimore, MD; F = Flint, MI; H = Fremont, CA; J = Janesville, WI; K = Kansas City, MO; N = Norwood, OH; P = Pontiac, MI; S = St. Louis, MO; T = Tarrytown, NY; and 1 = Oshawa, Ontario. Plant codes may vary by year and reference source, so unusual VINs should be verified against a year-specific VIN card.
• Seventh Through Twelfth Digits = Sequential Serial Number at Assembly Plant.

1965-1966 Chevrolet Truck VINs

• First Digit = Chassis Type, with C = 2-wheel drive and K = 4-wheel drive.
• Second and Third Digits = Series. Common pickup codes include 14 = 1/2-ton short bed with 115-inch wheelbase, 15 = 1/2-ton long bed with 127-inch wheelbase, and 25 = 3/4-ton long bed with 127-inch wheelbase. Additional series codes may appear depending on GVW rating, wheelbase, and body configuration.
• Fourth Digit = Model Type. Common pickup codes include 4 = Pickup. Other model-type codes may appear on commercial and special-body applications.
• Fifth Digit = Model Year, with 5 = 1965 and 6 = 1966.
• Sixth Digit = Assembly Plant. Common plant codes include A = Atlanta, GA; B = Baltimore, MD; F = Flint, MI; J = Janesville, WI; K = Kansas City, MO; N = Norwood, OH; P = Pontiac, MI; S = St. Louis, MO; T = Tarrytown, NY; Z = Fremont, CA; and 1 = Oshawa, Ontario.
• Seventh Through Twelfth Digits = Sequential Serial Number at Assembly Plant.

Note: Chevrolet and GMC trucks from this period used different serial number formats. Some commercial, export, fleet, and special-body applications may also differ. Always verify uncommon VINs using factory documentation or a year-specific VIN reference.

1967-1972 VIN Decoding

1967-1972 Chevrolet Truck VINs

• First Digit = Chassis Type, with C = 2-wheel drive and K = 4-wheel drive.
• Second Digit = Engine Type. Common Chevrolet truck codes include S = 6-cylinder gas engine and E = V8 gas engine. Additional engine codes may appear depending on model year and application.
• Third Digit = GVW Range, with 1 = 1/2-ton, 2 = 3/4-ton, and 3 = 1-ton.
• Fourth Digit = Model Type. Common Chevrolet truck codes include 4 = Pickup, 6 = Suburban, and 8 = Blazer.
• Fifth Digit = Model Year, with 7 = 1967, 8 = 1968, 9 = 1969, 0 = 1970, 1 = 1971, and 2 = 1972.
• Sixth Digit = Assembly Plant, with A = Atlanta, GA; B = Baltimore, MD; F = Flint, MI; J = Janesville, WI; K = Kansas City, MO; N = Norwood, OH; P = Pontiac, MI; S = St. Louis, MO; T = Tarrytown, NY; Z = Fremont, CA; and 1 = Oshawa, Ontario.
• Seventh Through Twelfth Digits = Sequential Serial Number at Assembly Plant.

Note: Chevrolet and GMC trucks from this period use similar VIN structures, but GMC VINs may use different manufacturer, engine, model-type, and year-code assignments. Some commercial, export, fleet, and special-body applications may also differ. Always verify uncommon VINs using factory documentation or a year-specific VIN reference.

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1973-1980 Chevy & GM VIN Decoder

• First Digit = Division, either C for Chevrolet or T for GMC
• Second Digit = Chassis Type, with C for 2-Wheel Drive and K for 4-Wheel Drive
• Third Digit = Engine Type And Size
  • 1973-1975, Q = 250 6-Cylinder, T= 292 6-Cylinder, X = 307 V8, V=350 2-Barrel V8, Y=350 4-Barrel V8, U= 400 4-Barrel V8, Z= 454 4-Barrel V8
  • 1976, D = 250 6-Cylinder, T=292 6-Cylinder, Q=305 2-Barrel V8, V=350 2-Barrel V8, L=350 4-Barrel V8, U=400 4-Barrel V8, S= 454 4-Barrel V8
  • 1977, D = 250 6-Cylinder, T=292 6-Cylinder, U=305 V8, L=350 4-Barrel V8, R=400 4-Barrel V8, S=454 4-Barrel V8
  • 1978, D = 250 6-Cylinder, T=292 6-Cylinder, U=305 V8, L=350 4-Barrel V8, R=400 4-Barrel V8, S=454 4-Barrel V8, Z = 350 Diesel V8
  • 1979, D = 250 6-Cylinder, T=292 6-Cylinder, U=305 V8, L=350 4-Barrel V8, R=400 V8, S=454 V8, Z = 350 Diesel V8
  • 1980, D = 250 6-Cylinder, T=292 6-Cylinder, G=305 V8, L=350 4-Barrel V8, M=350 4-Barrel V8, R=454 4-Barrel V8, W=454 V8, Z = 350 Diesel V8
• Fourth Digit = Vehicle Series with 1=10 (Chevy) or 15 (GMC) 1/2-ton, 2=20 (Chevy) or 25 (GMC) 3/4-ton, 3=30 (Chevy) or 35 (GMC)1-ton
• Fifth Digit = Body Type, with 2 = Chassis Only, 3 = Cab and Chassis, 4 = Pickup, 5=Panel, 6=Suburban, 7=Motorhome, and 8=Utility
• Sixth Digit = Year, with 3 = 1973, 4=1974, 5=1975, 6=1976, 7=1977, 8=1978, 9=1979, A=1980
• Seventh Digit = Assembly Plant, with A = Lakewood, GA, B=Baltimore, MD, F=Flint, MI, J=Janesville, WI, S=St. Louis, MO, V=Pontiac, MI, Z=Fremont, CA
• Eighth Through Thirteenth Digits = Sequential Serial Number At Plant Truck Was Manufactured

1981-1986 Chevy & GM Truck VIN Decoder Chart

• 17 Characters: Beginning in 1981, GM trucks used the standardized 17-character VIN format.
  • First Digit = Country of Manufacture, with 1 = United States, 2 = Canada, and 3 = Mexico. Some early 1981 imported applications may use 7 = Japan-built vehicles.
  • Second Digit = Manufacturer, with G = General Motors.
  • Third Digit = Make/vehicle type. C = Chevrolet Truck, T = GMC Truck, B = Chevrolet Incomplete Vehicle, D = GMC Incomplete Vehicle, 8 = Chevrolet MPV, and 5 = GMC MPV. Codes vary by year and vehicle line.
  • Fourth Digit = GVWR Range, with B = 3,001-4,000 lbs, C = 4,001-5,000 lbs, D = 5,001-6,000 lbs, E = 6,001-7,000 lbs, F = 7,001-8,000 lbs, G = 8,001-9,000 lbs, H = 9,001-10,000 lbs, J = 10,001-14,000 lbs, and K = 14,001-16,000 lbs.
  • Fifth Digit = Line & Chassis Type. Common codes include C = Conventional Cab 4x2, K = Conventional Cab 4x4, G = Van 4x2, P = Forward Control 4x2, S = Small Conventional Cab 4x2, T = Small Conventional Cab 4x4, M = Small Van 4x2, W = El Camino/Panel Delivery/Caballero 4x2, and Z = Special Body 4x2. Codes vary by model year and vehicle line.
  • Sixth Digit = Series, with 1 = 1/2-ton, 2 = 3/4-ton, 3 = 1-ton, 8 = 1/2-ton El Camino/Caballero, and 9 = Cadillac Commercial Body/Chassis or short sill cowl, depending on year/application.
  • Seventh Digit = Body Type, with 0 = Pickup Delivery, 1 = Hi-Cube/Cutaway Van, 2 = Forward Control, 3 = Four-Door Cab, 4 = Two-Door Cab, 5 = Van, 6 = Suburban, 7 = Motorhome Chassis, 8 = Utility, and 9 = Stake. Codes vary significantly by vehicle line, including pickups, vans, Suburbans, motorhome chassis, and commercial applications.
  • Eighth Digit = Engine Type and Size
  • Common full-size Chevrolet/GMC truck engine codes include:
  • 1981
  • D = 250 6-Cylinder
  • T = 292 6-Cylinder
  • G = 305 2-Barrel V8
  • H = 305 4-Barrel V8
  • L = 350 V8
  • M = HD 350 V8
  • Z = 350 Diesel V8
  • W = 454 V8
  • 1982-1984
  • D = 250 6-Cylinder
  • T = 292 6-Cylinder
  • H = 305 V8
  • L = 350 V8
  • M = HD 350 V8
  • C = 6.2L Diesel V8
  • J = 6.2L Diesel V8
  • W = 454 V8
  • 1985-1986
  • T = 292 6-Cylinder
  • N = 262 V6
  • H = 305 V8
  • L = 350 V8
  • M = HD 350 V8
  • C = 6.2L Diesel V8
  • J = 6.2L Diesel V8
  • W = 454 V8
  • Note: Engine codes changed throughout the 1981-1986 production years. The listings above cover the most common full-size Chevrolet and GMC truck applications. Specific engine identification should be verified against the vehicle's model year and factory documentation. Engine codes may vary by vehicle line, GVWR classification, emissions certification, and production year.
  • Ninth Digit = Check Digit
  • Tenth Digit = Model Year, with B = 1981, C = 1982, D = 1983, E = 1984, F = 1985, and G = 1986.
  • Eleventh Digit = Assembly Plant. Common plant codes include F = Flint, MI; J = Janesville, WI; S = St. Louis, MO; Z = Fremont, CA; E = Pontiac, MI; and 1 = Oshawa, Ontario. Additional plant codes may appear depending on vehicle line and model year.
  • Twelfth Through Seventeenth Digits = Sequential Serial Number at Assembly Plant.

1987-1991 Chevy & GM Truck VIN Decoder Chart

• 17 Characters: Beginning in 1981, GM trucks used the standardized 17-character VIN format
  • First Digit = Country of Manufacture, with 1 = United States, 2 = Canada, and 3 = Mexico.
  • Second Digit = Manufacturer, with G = General Motors.
  • Third Digit = Make/vehicle type. Examples include C = Chevrolet Truck, T = GMC Truck, B = Chevrolet Incomplete Vehicle, D = GMC Incomplete Vehicle, N = Chevrolet MPV, and K = GMC MPV. Additional codes may appear depending on model year and vehicle line.
  • Fourth Digit = GVWR Range, with B = 3,001-4,000 lbs, C = 4,001-5,000 lbs, D = 5,001-6,000 lbs, E = 6,001-7,000 lbs, F = 7,001-8,000 lbs, G = 8,001-9,000 lbs, H = 9,001-10,000 lbs, J = 10,001-14,000 lbs, and K = 14,001-16,000 lbs.
  • Fifth Digit = Line & Chassis Type. Common codes include C = Conventional Cab 4x2, K = Conventional Cab 4x4, R = Conventional Cab/Chassis 4x2, V = Conventional Cab/Chassis 4x4, G = Van 4x2, P = Forward Control 4x2, S = Small Conventional Cab 4x2, T = Small Conventional Cab 4x4, M = Small Van 4x2, and Z = Special Body 4x2. Codes vary by model year and vehicle line.
  • Sixth Digit = Series, with 1 = 1/2-ton, 2 = 3/4-ton, and 3 = 1-ton. Other series codes may appear depending on vehicle line and application.
  • Seventh Digit = Body Type. Common codes include 3 = Crew Cab/Four-Door Cab, 4 = Two-Door Cab, 6 = Suburban, 8 = Blazer/Jimmy/Utility, and 9 = Extended Cab. Codes vary by vehicle line, including pickups, vans, Suburbans, Blazers/Jimmys, motorhome chassis, and commercial applications.
  • Eighth Digit = Engine Type and Size

Common full-size Chevrolet/GMC truck engine codes include:

1987

• H = 305 V8 with TBI
• K = 350 V8 with TBI
• C = 6.2L Diesel V8
• J = 6.2L Diesel V8
• W = 454 V8 with 4-Barrel Carburetor
• N = 454 V8 with TBI

1988-1989

• C = 6.2L Diesel V8
• H = 305 V8
• J = 6.2L Diesel V8
• K = 350 V8
• N = 454 V8 with TBI
• W = 454 V8 with 4-Barrel Carburetor
• Z = 262 V6

1990-1991

• C = 6.2L Diesel V8
• H = 305 V8
• J = 6.2L Diesel V8
• K = 350 V8
• N = 454 V8
• Z = 262 V6

Note: Engine codes changed during the 1987-1991 production years. The listings above cover common full-size Chevrolet and GMC truck applications, including the transition from R/V carryover trucks to 1988+ C/K pickups. Specific engine identification should be verified against the vehicle's model year, VIN card, and factory documentation. Engine codes may vary by vehicle line, GVWR classification, emissions certification, and production year.

• Ninth Digit = Check Digit.
• Tenth Digit = Model Year, with H = 1987, J = 1988, K = 1989, L = 1990, and M = 1991.
• Eleventh Digit = Assembly Plant. Common plant codes include E = Pontiac, MI; F = Flint, MI; J = Janesville, WI; S = St. Louis, MO; Z = Fort Wayne, IN; and 1 = Oshawa, Ontario. Plant codes varied by model year, vehicle line, and production facility.
• Twelfth Through Seventeenth Digits = Sequential Serial Number at Assembly Plant.

1992-1995 Chevy & GM Truck VIN Decoder Chart

• 17 Characters: Beginning in 1981, GM trucks used the standardized 17-character VIN format.
  • First Digit = Country of Manufacture, with 1 = United States, 2 = Canada, and 3 = Mexico.
  • Second Digit = Manufacturer, with G = General Motors.
  • Third Digit = Make/vehicle type. Examples include C = Chevrolet Truck, T = GMC Truck, B = Chevrolet Incomplete Vehicle, D = GMC Incomplete Vehicle, N = Chevrolet MPV, and K = GMC MPV. Additional codes may appear depending on model year and vehicle line.
  • Fourth Digit = GVWR Range, with B = 3,001-4,000 lbs, C = 4,001-5,000 lbs, D = 5,001-6,000 lbs, E = 6,001-7,000 lbs, F = 7,001-8,000 lbs, G = 8,001-9,000 lbs, H = 9,001-10,000 lbs, J = 10,001-14,000 lbs, and K = 14,001-16,000 lbs.
  • Fifth Digit = Line & Chassis Type. Common codes include C = Conventional Cab 4x2, K = Conventional Cab 4x4, R = Conventional Cab/Chassis 4x2, V = Conventional Cab/Chassis 4x4, G = Van 4x2, P = Forward Control 4x2, S = Small Conventional Cab 4x2, T = Small Conventional Cab 4x4, M = Small Van 4x2, and Z = Special Body 4x2. Codes vary by model year and vehicle line.
  • Sixth Digit = Series, with 1 = 1/2-ton, 2 = 3/4-ton, and 3 = 1-ton. Other series codes may appear depending on vehicle line and application.
  • Seventh Digit = Body Type. Common codes include 3 = Crew Cab/Four-Door Cab, 4 = Two-Door Cab, 6 = Suburban, 8 = Blazer/Jimmy/Utility, and 9 = Extended Cab. Codes vary by vehicle line, including pickups, vans, Suburbans, Blazers/Jimmys, motorhome chassis, and commercial applications.
  • Eighth Digit = Engine Type and Size

Common full-size Chevrolet/GMC truck engine codes include:

1992-1993

• C = 6.2L Diesel V8
• F = 6.5L Turbo Diesel V8
• H = 5.0L V8
• J = 6.2L Diesel V8
• K = 5.7L V8
• N = 7.4L (454) V8
• Z = 4.3L V6

1994-1995

• F = 6.5L Turbo Diesel V8
• H = 5.0L V8
• K = 5.7L V8
• N = 7.4L (454) V8
• P = 6.5L Diesel V8
• S = 6.5L Turbo Diesel V8
• Z = 4.3L V6

Note: Engine codes changed during the 1992-1995 production years. The listings above cover common full-size Chevrolet and GMC truck applications. Specific engine identification should be verified against the vehicle's model year, VIN card, and factory documentation. Engine codes may vary by vehicle line, GVWR classification, emissions certification, and production year.

• Ninth Digit = Check Digit.
• Tenth Digit = Model Year, with N = 1992, P = 1993, R = 1994, and S = 1995.
• Eleventh Digit = Assembly Plant. Common plant codes include E = Pontiac, MI; F = Flint, MI; J = Janesville, WI; R = Arlington, TX; G = Silao, Mexico; and 1 = Oshawa, Ontario. Plant codes varied by model year, vehicle line, and facility.
• Twelfth Through Seventeenth Digits = Sequential Serial Number at Assembly Plant.

1996-1998 Chevy & GM Truck VIN Decoder Chart

• 17 Characters: Beginning in 1981, GM trucks used the standardized 17-character VIN format.
  • First Digit = Country of Manufacture, with 1 = United States, 2 = Canada, and 3 = Mexico.
  • Second Digit = Manufacturer, with G = General Motors.
  • Third Digit = Make/vehicle type. Examples include C = Chevrolet Truck, T = GMC Truck, B = Chevrolet Incomplete Vehicle, D = GMC Incomplete Vehicle, N = Chevrolet MPV, and K = GMC MPV. Additional codes may appear depending on model year and vehicle line.
  • Fourth Digit = GVWR Range, with B = 3,001-4,000 lbs, C = 4,001-5,000 lbs, D = 5,001-6,000 lbs, E = 6,001-7,000 lbs, F = 7,001-8,000 lbs, G = 8,001-9,000 lbs, H = 9,001-10,000 lbs, J = 10,001-14,000 lbs, and K = 14,001-16,000 lbs.
  • Fifth Digit = Line & Chassis Type. Common codes include C = Conventional Cab 4x2, K = Conventional Cab 4x4, R = Conventional Cab/Chassis 4x2, V = Conventional Cab/Chassis 4x4, G = Van 4x2, P = Forward Control 4x2, S = Small Conventional Cab 4x2, T = Small Conventional Cab 4x4, M = Small Van 4x2, and Z = Special Body 4x2. Codes vary by model year and vehicle line.
  • Sixth Digit = Series, with 1 = 1/2-ton, 2 = 3/4-ton, and 3 = 1-ton. Other series codes may appear depending on vehicle line and application.
  • Seventh Digit = Body Type. Common codes include 3 = Crew Cab/Four-Door Cab, 4 = Two-Door Cab, 6 = Suburban, 8 = Blazer/Jimmy/Utility, and 9 = Extended Cab. Codes vary by vehicle line, including pickups, vans, Suburbans, Blazers/Jimmys, motorhome chassis, and commercial applications.
  • Eighth Digit = Engine Type and Size

Common full-size Chevrolet/GMC truck engine codes include:

1996-1998

• F = 6.5L Turbo Diesel V8
• H = 5.0L Vortec V8
• M = 5.7L Vortec V8
• J = 7.4L (454) Vortec V8
• R = 5.7L Vortec V8
• S = 6.5L Turbo Diesel V8
• W = 4.3L Vortec V6

Note: Engine codes changed during the 1996-1998 production years. The listings above cover common full-size Chevrolet and GMC truck applications. Specific engine identification should be verified against the vehicle's model year, VIN card, and factory documentation. Engine codes may vary by vehicle line, GVWR classification, emissions certification, and production year.

• Ninth Digit = Check Digit.
• Tenth Digit = Model Year, with T = 1996, V = 1997, and W = 1998.
• Eleventh Digit = Assembly Plant. Common plant codes include E = Pontiac, MI; F = Flint, MI; G = Silao, Mexico; J = Janesville, WI; R = Arlington, TX; and 1 = Oshawa, Ontario. Plant codes varied by model year, vehicle line, and facility.
• Twelfth Through Seventeenth Digits = Sequential Serial Number at Assembly Plant.

1999-2009 Chevrolet & GM Truck VIN Decoder Chart

• 17 Characters: Beginning in 1981, GM trucks used the standardized 17-character VIN format.
  • First Digit = Country of Manufacture, with 1 = United States, 2 = Canada, and 3 = Mexico.
  • Second and Third Digits = Division/Make, with GC = Chevrolet Truck, GB = Chevrolet Incomplete Vehicle, GT = GMC Truck, GD = GMC Incomplete Vehicle, GN = Chevrolet SUV, and GK = GMC SUV.
  • Fourth Digit = GVWR Range and Brake System. Common codes include E = 6,001-7,000 lbs, F = 7,001-8,000 lbs, G = 8,001-9,000 lbs, H = 9,001-10,000 lbs, and J = 10,001-14,000 lbs. Codes may vary by model year and vehicle line.
  • Fifth Digit = Drive and Chassis Type, with C = 2WD and K = 4WD.
  • Sixth Digit = Series or Trim.
    • 1999-2007 Classic/Old Body Style: 1 = 1/2-ton, 2 = 3/4-ton, 3 = 1-ton, and 6 = 1/2-ton luxury model, such as GMC C3 or Denali.
    • 2008-2009 New Body Style: 1 = 1/2-ton Chevrolet/GMC Work Truck, Chevrolet LS, or GMC SL; 2 = 1/2-ton Chevrolet LT or GMC SLE; 3 = 1/2-ton Chevrolet LTZ or GMC SLT; 4 = 3/4-ton Chevrolet/GMC Work Truck, Chevrolet LS, or GMC SL; 5 = 3/4-ton Chevrolet LT or GMC SLE; 6 = 3/4-ton Chevrolet LTZ or GMC SLT; 7 = 1-ton Chevrolet/GMC Work Truck; 8 = 1-ton Chevrolet LT or GMC SLE; 9 = 1-ton Chevrolet LTZ or GMC SLT; and 0 = 1/2-ton GMC Denali.
  • Seventh Digit = Body Type. Common codes include 3 = Four-Door Crew Cab or Tahoe/Yukon, 4 = Two-Door Cab, 6 = Suburban/Yukon XL, and 9 = Extended Cab. Body type codes may vary by model year and vehicle line.
  • Eighth Digit = Engine Type and Size

Common Chevrolet/GMC truck engine codes include:

1999-2000

• T = 5.3L V8
• U = 6.0L V8
• V = 4.8L V8
• W = 4.3L V6

2001

• G = 8.1L V8
• T = 5.3L V8
• U = 6.0L V8
• V = 4.8L V8
• W = 4.3L V6
• 1 = 6.6L Diesel V8

2002

• G = 8.1L V8
• N = 6.0L V8
• T = 5.3L V8
• U = 6.0L V8
• V = 4.8L V8
• W = 4.3L V6
• X = 4.3L V6
• Z = 5.3L Flex Fuel V8
• 1 = 6.6L Diesel V8

2003

• G = 8.1L V8
• N = 6.0L V8
• T = 5.3L V8
• U = 6.0L V8
• V = 4.8L V8
• X = 4.3L V6
• Z = 5.3L Flex Fuel V8
• 1 = 6.6L Diesel V8

2004

• G = 8.1L V8
• N = 6.0L V8
• T = 5.3L V8
• U = 6.0L V8
• V = 4.8L V8
• X = 4.3L V6
• Z = 5.3L Flex Fuel V8
• 1 = 6.6L Diesel V8
• 2 = 6.6L Diesel V8

2005

• B = 5.3L V8
• G = 8.1L V8
• N = 6.0L V8
• T = 5.3L V8
• U = 6.0L V8
• V = 4.8L V8
• X = 4.3L V6
• Z = 5.3L Flex Fuel V8
• 2 = 6.6L Diesel V8

2006

• B = 5.3L V8
• D = 6.6L Diesel V8
• G = 8.1L V8
• N = 6.0L V8
• T = 5.3L V8
• U = 6.0L V8
• V = 4.8L V8
• X = 4.3L V6
• Z = 5.3L Flex Fuel V8
• 2 = 6.6L Diesel V8

2007 Classic/Old Body Style

• B = 5.3L V8
• D = 6.6L Diesel V8
• G = 8.1L V8
• N = 6.0L V8
• T = 5.3L V8
• U = 6.0L V8
• V = 4.8L V8
• X = 4.3L V6
• Z = 5.3L Flex Fuel V8

2007-2009 New Body Style

• C = 4.8L V8
• J = 5.3L V8
• K = 6.0L V8
• M = 5.3L V8
• X = 4.3L V6
• Y = 6.0L V8
• 0 = 5.3L V8
• 2 = 6.2L V8
• 3 = 5.3L Flex Fuel V8
• 5 = 6.0L Hybrid V8
• 6 = 6.6L Diesel V8
• 8 = 6.2L V8

Note: Engine codes changed throughout the 1999-2009 production years, and 2007 included both Classic/old body style and new body style trucks. The listings above cover common Chevrolet and GMC truck applications. Specific engine identification should be verified against the vehicle's model year, VIN card, RPO code, and factory documentation, particularly for 2007 models, which were produced in both Classic and New Body Style configurations. Engine codes may vary by vehicle line, GVWR classification, emissions certification, and production year.

• Ninth Digit = Check Digit.
• Tenth Digit = Model Year, with X = 1999, Y = 2000, 1 = 2001, 2 = 2002, 3 = 2003, 4 = 2004, 5 = 2005, 6 = 2006, 7 = 2007, 8 = 2008, and 9 = 2009.
• Eleventh Digit = Assembly Plant. Common plant codes include 1 = Oshawa, Ontario; E = Pontiac, MI; F = Flint, MI; G = Silao, Mexico; J = Janesville, WI; R = Arlington, TX; and Z = Fort Wayne, IN. Plant codes varied by model year, vehicle line, and facility.
• Twelfth Through Seventeenth Digits = Sequential Serial Number at Assembly Plant.

2010-2013 Chevy & GM Truck VIN Number Decoder

• 17 Characters: Beginning in 1981, GM trucks used the standardized 17-character VIN format.
  • First Digit = Country of Manufacture. Common codes include 1 or 5 = United States, 2 = Canada, and 3 = Mexico, depending on vehicle line and WMI.
  • Second and Third Digits = Division/Make. Common combinations include GC = Chevrolet Truck, GT = GMC Truck, GN = Chevrolet SUV, GK = GMC SUV, GB = Chevrolet Incomplete Vehicle, and GD = GMC Incomplete Vehicle. Additional combinations may appear depending on vehicle line and application.
  • Fourth Digit = GVWR, Brake System, and Body Style. This position identifies a combined GVWR/brake/body-style classification, rather than only a weight rating. Codes vary by model year, body style, and vehicle line.
  • Fifth and Sixth Digits = Chassis, Series, and Trim Combination. These positions should be read together. Common applications include Chevrolet Silverado, GMC Sierra, Tahoe, Suburban, Yukon, Yukon XL, Express, Savana, and related full-size GM truck and SUV platforms. Series and trim codes may identify 1500, 2500HD, 3500HD, Work Truck, LS, LT, LTZ, SLE, SLT, Denali, Hybrid, and other configurations depending on model year and vehicle line. Verify exact trim and series identification using the vehicle's VIN card, RPO codes, and factory documentation.
  • Seventh Digit = Restraint System. Common codes identify combinations of manual belts, front airbags, front-seat side airbags, and roof-side/curtain airbags. Restraint codes vary by model year and seating configuration.
  • Eighth Digit = Engine Type and Size.

Common Chevrolet/GMC truck and SUV engine codes include:

2010-2013

• A = 4.8L V8 (L20)
• B = 6.0L V8 CNG (LC8)
• F = 6.2L V8 (L94)
• G = 6.0L V8 (L96)
• J = 6.0L V8 Hybrid (LZ1)
• K = 6.0L V8 (LY6)
• L = 6.6L Duramax Diesel V8 (LGH)
• P = 5.3L V8 (LH9)
• X = 4.3L V6 (LU3)
• 0 = 5.3L V8 (LMG)
• 2 = 6.2L V8 (L9H)
• 3 = 5.3L V8 (LC9)
• 4 = 5.3L V8 (LMF)
• 6 = 6.6L Duramax Diesel V8 (LMM)
• 7 = 5.3L V8 Flex Fuel (LFW)
• 8 = 6.6L Duramax Diesel V8 (LML)

Note: Engine codes varied by vehicle line, emissions certification, GVWR classification, and production year. Specific engine identification should be verified against the vehicle's model year, VIN card, RPO code, and factory documentation.

• Ninth Digit = Check Digit.
• Tenth Digit = Model Year, with A = 2010, B = 2011, C = 2012, and D = 2013.
• Eleventh Digit = Assembly Plant. Common plant codes include F = Flint, MI; R = Arlington, TX; Z = Fort Wayne, IN; G = Silao, Mexico; S = Ramos Arizpe, Mexico; J = Lansing Delta Township, MI; 1 = Oshawa, Ontario or Wentzville, MO depending on WMI/vehicle line; and 6 = Ingersoll, Ontario. Plant codes varied by model year, vehicle line, WMI, and production facility.
• Twelfth Through Seventeenth Digits = Sequential Serial Number at Assembly Plant.

2014-2019 Chevrolet & GMC Truck VIN Decoder Chart

• 17 Characters: Beginning in 1981, GM trucks used the standardized 17-character VIN format.
  • First Digit = Country of Manufacture. Common codes include 1 = United States, 2 = Canada, and 3 = Mexico. Additional region codes may appear depending on vehicle line and WMI.
  • Second and Third Digits = Division/Make. Common combinations include GC = Chevrolet Truck, GB = Chevrolet Incomplete Vehicle, GT = GMC Truck, GD = GMC Incomplete Vehicle, GN = Chevrolet SUV, and GK = GMC SUV. Additional combinations may appear depending on vehicle line and application.
  • Fourth Digit = GVWR, Brake System, and Body Style. This position identifies a combined GVWR/brake/body-style classification, rather than only a weight rating. Codes vary by model year, body style, and vehicle line.
  • Fifth and Sixth Digits = Chassis, Series, and Trim Combination. These positions should be read together. Common applications include 2WD and 4WD versions of Chevrolet Silverado, GMC Sierra, Tahoe, Suburban, Yukon, Yukon XL, Express, Savana, and related full-size GM truck/SUV platforms. Series and trim codes may identify 1500, 2500HD, 3500HD, Work Truck/Fleet/Base, Custom, LS, LT, LTZ, High Country, SLE, SLT, Denali, and other configurations depending on model year and vehicle line. Verify exact trim and series identification using the vehicle's VIN card, RPO codes, and factory documentation.
  • Seventh Digit = Restraint System. Common codes identify combinations of manual belts, front airbags, front-seat side airbags, roof-side/curtain airbags, and other restraint equipment. Restraint codes vary by model year, seating configuration, and vehicle line.
  • Eighth Digit = Engine Type and Size.

Common Chevrolet/GMC truck and SUV eighth-digit engine codes include:

2014

• C = 5.3L V8 (L83)
• G = 6.0L V8 (L96)
• H = 4.3L V6 (LV3)
• J = 6.2L V8 (L86)
• P = 4.3L V6 (LV1)
• 8 = 6.6L Duramax Diesel V8 (LML)

2015-2016

• C = 5.3L V8 (L83)
• G = 6.0L V8 (L96)
• H = 4.3L V6 (LV3)
• J = 6.2L V8 (L86)
• L = 6.6L Duramax Diesel V8 (LML)
• P = 4.3L V6 (LV1)

2017-2018

• C = 5.3L V8 (L83)
• G = 6.0L V8 (L96)
• H = 4.3L V6 (LV3)
• J = 6.2L V8 (L86)
• P = 4.3L V6 (LV1)
• R = 5.3L V8 eAssist (L8B)
• Y = 6.6L Duramax Diesel V8 (L5P)

2019 Legacy and New Body Style

• C = 5.3L V8 (L83)
• D = 2.7L Turbo I4 (L3B)
• G = 6.0L V8 (L96)
• H = 4.3L V6 (LV3)
• J = 6.2L V8 (L86)
• P = 4.3L V6 (LV1)
• R = 5.3L V8 eAssist (L8B)
• U = 5.3L V8 (L82)

Common HD applications may also use additional engine codes for:
• 6.6L Duramax Diesel V8
• 6.6L Gas V8

Verify HD engine identification using the vehicle's VIN card and RPO codes.

Note: Engine codes varied by model year, vehicle line, emissions certification, GVWR classification, and production year. The 2019 model year included both Legacy (K2XX) and New Body Style (T1XX) trucks, which may use different engine and VIN-code combinations. Engine identification should be verified using the vehicle's model year, VIN card, RPO code, and factory documentation.

• Ninth Digit = Check Digit.
• Tenth Digit = Model Year, with E = 2014, F = 2015, G = 2016, H = 2017, J = 2018, and K = 2019.
• Eleventh Digit = Assembly Plant. Common plant codes include F = Flint, MI; G = Silao, Mexico; R = Arlington, TX; Z = Fort Wayne, IN; 1 = Oshawa, Ontario; and other codes depending on WMI, vehicle line, and production facility. Plant codes varied by model year, vehicle line, WMI, and facility.
• Twelfth Through Seventeenth Digits = Sequential Serial Number at Assembly Plant.

2020-2026 Chevrolet & GMC Truck VIN Decoder Chart

• 17 Characters: Beginning in 1981, GM trucks used the standardized 17-character VIN format.
  • First Digit = Country of Manufacture. Common codes include 1 = United States, 2 = Canada, and 3 = Mexico. Additional WMI region codes may appear depending on vehicle line and production source.
  • Second and Third Digits = Division/Make. Common combinations include GC = Chevrolet Truck, GB = Chevrolet Incomplete Vehicle, GT = GMC Truck, GD = GMC Incomplete Vehicle, GN = Chevrolet SUV, and GK = GMC SUV. Additional combinations may appear depending on vehicle line and application.
  • Fourth Digit = GVWR, Brake System, and Body Style. This position identifies a combined GVWR/brake/body-style classification, rather than only a weight rating. Codes vary by model year, body style, GVWR class, and vehicle line.
  • Fifth and Sixth Digits = Chassis, Series, and Trim Combination. These positions should be read together. Common applications include 2WD and 4WD versions of Chevrolet Silverado, GMC Sierra, Tahoe, Suburban, Yukon, Yukon XL, Express, Savana, Colorado, Canyon, and related GM truck/SUV platforms. Series and trim codes may identify 1500, 2500HD, 3500HD, Work Truck/Fleet/Base, Custom, LT, RST, LTZ, High Country, ZR2, SLE, SLT, AT4, AT4X, Denali, Denali Ultimate, and other configurations depending on model year and vehicle line. Verify exact trim and series identification using the vehicle's VIN card, RPO codes, and factory documentation.
  • Seventh Digit = Restraint System. Common codes identify combinations of manual belts, front airbags, front-seat side airbags, roof-side/curtain airbags, knee airbags, and other restraint equipment. Restraint codes vary by model year, seating configuration, and vehicle line.
  • Eighth Digit = Engine Type and Size.

Common Chevrolet/GMC truck and SUV eighth-digit engine codes include:

2020-2022

• D = 5.3L V8 (L84)
• F = 5.3L V8 (L82)
• H = 4.3L V6 (LV3)
• K = 2.7L Turbo I4 (L3B)
• L = 6.2L V8 (L87)
• T = 3.0L Duramax Diesel I6 (LM2)
• Y = 6.6L Duramax Diesel V8 (L5P)
• 7 = 6.6L Gas V8 (L8T)

2023-2026

• D = 5.3L V8 (L84)
• K = 2.7L Turbo I4 (L3B)
• L = 6.2L V8 (L87)
• Y = 6.6L Duramax Diesel V8 (L5P)
• 7 = 6.6L Gas V8 (L8T)
• 8 = 3.0L Duramax Diesel I6 (LZ0)

Note: Engine codes varied by model year, vehicle line, emissions certification, GVWR classification, and production year. Some 2022 applications included carryover or Limited models, and engine availability changed again for certain 2023-2026 applications. Engine identification should be verified using the vehicle's model year, VIN card, RPO code, and factory documentation.

• Ninth Digit = Check Digit.
• Tenth Digit = Model Year, with L = 2020, M = 2021, N = 2022, P = 2023, R = 2024, S = 2025, and T = 2026.
• Eleventh Digit = Assembly Plant. Common plant codes include F = Flint, MI; G = Silao, Mexico; R = Arlington, TX; Z = Fort Wayne, IN; 1 = Oshawa, Ontario or Wentzville, MO depending on WMI/vehicle line; and other codes depending on WMI, vehicle line, and production facility. Plant codes varied by model year, vehicle line, WMI, and facility.
• Twelfth Through Seventeenth Digits = Sequential Serial Number at Assembly Plant.

Understanding your GM truck's VIN can help verify authenticity, identify factory specifications, and better understand how a vehicle was originally equipped. Because VIN structures and code assignments can vary by model year, vehicle line, GVWR classification, and production application, always verify critical identification information using factory documentation.

If you have any questions or need further assistance with your GM truck's VIN decoding, feel free to reach out to us at JEGS High Performance. We're here to help you on your automotive journey.