Factory build sheet

2004 GMC Sierra C2500 Heavy Duty

Build 1GTHC242-4 · 6.6L 8cyl · Pickup

VIN positions 1 through 8 read 1GTHC242 and position 10 reads 4. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.

Every Sierra whose VIN starts 1GTHC242 and carries 4 in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 17 of them.

  • Decoded Jul 7, 2026
  • 17 known VINs

Factory specification

As filed by GMC with NHTSA for this build. Fields the filing does not record are left out entirely — a missing row means no recorded value, not a missing feature.

Engine

Displacement
6.6 L
Cylinders
8
Configuration
V-Shaped
Engine model
LLY
Engine manufacturer
Isuzu
Turbocharged
Yes
Fuel type
Diesel

Drivetrain

Drive type
4x2
Brake system
Hydraulic

Body & chassis

Body class
Pickup
NHTSA body type
TRUCK
Doors
2
Series
2500 (3/4 Ton)
Manufacturer
GENERAL MOTORS LLC

Weight rating

GVWR class
Class 2H
GVWR
9,001–10,000 lb

Gross vehicle weight rating is the loaded ceiling set by the manufacturer, not the car's own weight.

The same build, other model years

GMC used the VIN pattern 1GTHC242 for 2 model years. Nothing but the year changes between these pages, so the price gap between them is depreciation on an identical car.

How this VIN pattern is read

A 17-character VIN carries two kinds of information: what was built, and which one it is. This page is the first kind — the nine highlighted positions.

Positions Characters What they encode
1–3 1GT GENERAL MOTORS LLC · World manufacturer identifier
4–8 HC242 Model, body style, engine and restraint system
9 × Check digit — computed per vehicle, not part of the build
10 4 Model year — 2004
11 × Assembly plant
12–17 ×××××× Production sequence number, unique to each vehicle

NHTSA safety ratings

Crash-test results are published per model year and body style, so they cover the 2004 GMC Sierra as a whole rather than this build alone.

Rollover

★★★★ ★ 4 / 5

16 recall campaigns are recorded for the 2004 Sierra. Recalls are issued per VIN range — check the VIN of the car you are looking at, not the model.

17 vehicles carry this build

Every VIN we have decoded to 1GTHC242-4 shares the specification above.

  • 17 Known VINs

Keep going

Where this data comes from

Specification fields are decoded from the manufacturer's filings in the NHTSA vPIC database, keyed on VIN positions 1–8 and 10. We publish the filed values as they stand and leave out anything the filing does not record.

Vehicle counts come from the 17 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.