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
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The scan tool displays an 8-digit number which indicates the GM part number of the module.
- Calibration ID
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The scan tool displays a 4-digit number which indicates the calibration ID number of the module.
- Invalid Transmitter
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The scan tool displays Greater than 10 or Less than 10 which indicates how many times an invalid transmitter has been used in the vicinity of the vehicle.
- No. of Fobs Programmed
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The scan tool displays 1 Fob-4 Fobs to indicate the number of keyless entry transmitters that are programmed for the system.
- Key Pressed On Fob
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The scan tool displays Dr. Door Unlock, Door Lock, All Door Unlock, Trunk, or Fuel Door/Alarm which indicates the last pressed keyless entry transmitter button.
- Last Fob Used
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The scan tool displays Fob #1-Fob #4 which indicates the number of the last keyless entry transmitter used to operate the keyless entry system.
- PROM ID
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The scan tool displays a 4-digit number that identifies the PROM.
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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.