Factory build sheet

2012 GMC Sierra Work Truck/Fleet/Base

Build 1GD312CL-C · 6.6L 8cyl · Incomplete - Chassis CAB (Single CAB)

VIN positions 1 through 8 read 1GD312CL and position 10 reads C. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.

Every Sierra whose VIN starts 1GD312CL and carries C in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 21 of them.

  • Decoded Sep 9, 2026
  • 21 known VINs
  • 1 listed for sale now

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
LGH
Engine manufacturer
DURAMAX
Turbocharged
Yes
Fuel type
Diesel

Drivetrain

Drive type
4x2
Brake system
Hydraulic

Body & chassis

Body class
Incomplete - Chassis Cab (Single Cab)
NHTSA body type
INCOMPLETE VEHICLE
Doors
2
Series
3500
Manufacturer
GENERAL MOTORS LLC

Weight rating

GVWR class
Class 3
GVWR
10,001–14,000 lb

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

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 1GD GENERAL MOTORS LLC · World manufacturer identifier
4–8 312CL Model, body style, engine and restraint system
9 × Check digit — computed per vehicle, not part of the build
10 C Model year — 2012
11 × Assembly plant
12–17 ×××××× Production sequence number, unique to each vehicle

21 vehicles carry this build

Every VIN we have decoded to 1GD312CL-C shares the specification above.

  • 21 Known VINs
  • 1 Listed for sale now

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 21 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.