Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Identification
The vehicle identification number (VIN) is located on the left side rear of the engine block (1) and is typically a 9 digit number stamped or laser-etched onto the engine at the vehicle assembly plant.
- The first digit identifies the division.
- The second digit identifies the model year.
- The third digit identifies the assembly plant.
- The fourth through ninth digits are the last 6 digits of the VIN.
Engine identification can also be made through use of the Engine Traceability label (2) on the rear of the left cylinder head.
- Broadcast Code
- Machine Readable 2D Matrix
- VPPS Code
- Part Sequence Number
- Reserved use
- Broadcast Code
- Model year
- Julian Date
- Build Year
- Shift ID
- Plant ID
- GM Part Number
- Plant DUNS Number
- Sequence Number
- RPO/Engine Family Code
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.