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.
Scan Tool Data Definitions
8-Digit GM Part Number: The scan tool displays an 8-digit alphanumeric number. The part number of the module.
Component Serial #8-11: The scan tool displays an 8-digit alphanumeric number. The part number of the module.
Component Serial #12: The scan tool displays an 8-digit alphanumeric number. The part number of the module.
Component Serial # 13-1: The scan tool displays 0-9. The internal programing codes of the module.
Component Serial # 17-1: The scan tool displays 0-9. The internal programing codes of the module.
Fuel Door Unlock Relay: The scan tool displays ON when the relay has been activated.
Julian Date of Build: The scan tool displays 0-999. The month and year that the module was built.
PROM ID: The scan tool displays 0-9999. The identification number of the radios internal PROM.
Trunk Ajar Switch: The scan tool displays ON when the switch has been activated.
Trunk Release Switch: The scan tool displays ON when the switch has been activated.
Year Module Built: The scan tool displays a 1990-2020. The production year the module was manufactured.
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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.