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 the module GM part number.
Battery Voltage: The scan tool displays 0-20 Volts. The scan tool displays the voltage as received on the battery positive voltage circuit of the Module or the 72-08 battery voltage message from the DIM over class serial data 2 line.
Calibration ID: The scan tool displays the Calibration ID number for service identification.
Component Serial #8-11: Digits 8 to 11 of the component serial number of the control module.
Component Serial #8-12: Digits 8 to 12 of the component serial number of the control module.
Component Serial #12: Digit 12 of the component serial number of the control module.
Component Serial #13-16: Digits 13 to 16 of the component serial number of the control module.
Component Serial #17-18: Digits 17 to 18 of the component serial number of the control module.
Ign. 3 Input: The scan tool displays Active/Inactive. Display indicates the state of the ignition 3 input.
Ign. Accessory: The scan tool displays Active/Inactive. Display indicates the state of the ignition accessory input.
Ign. Crank/Run: The scan tool displays Active/Inactive. Display indicates the state of the ignition crank/run input.
Ign. Run: The scan tool displays Active/Inactive. Display indicates the state of the ignition run input.
Ign. Unlock: The scan tool displays Active/Inactive. Display indicates the state of the ignition unlock input.
Ignition Counter: The scan tool displays 0-255 counts. The module counts each time the ignition is cycled.
Ignition Crank: The scan tool displays Active/Inactive. The scan tool displays Active when the DIM receives a battery voltage signal from the ignition switch.
Ignition Cycle Counter: The scan tool displays 0-100. Display indicates the number of ignition cycles up to 100.
Ignition Switch: The scan tool displays Accy/Crank/Off/RAP/RAP-Unlock/Run/Unlock. The scan tool displays Accy when the accessory and unlock circuits of the DIM receives a battery voltage signal from the ignition switch. The scan tool displays Crank when the Crank/Run, Run and Unlock circuits of the DIM receives a battery voltage signal from the ignition switch. The scan tool displays Off when none of the power moding circuits of the DIM receive a battery voltage signal from the ignition switch. The scan tool displays RAP (Retained Accessory Power) when RAP is active and none of the power moding circuits of the DIM receive a battery voltage signal from the ignition switch. The scan tool displays RAP-Unlock when RAP is active and the Ign. Unlock circuit of the DIM receives a battery voltage signal from the ignition switch. The scan tool displays Run when all of the power moding circuits of the DIM receive a battery voltage signal from the ignition switch. The scan tool displays Unlock when the Unlock circuit of the DIM receives a battery voltage signal from the ignition switch.
PROM ID: The scan tool displays the module PROM ID.
Run/Crank: The scan tool displays On/Off. The scan tool displays On when the Run/Crank circuit of the IPM receives a battery voltage signal from the ignition switch.
Vehicle Speed: The scan tool displays 0-249 km/h (0-155 mph). This value is used to calculate the outside air temperature when the vehicle is moving.
Year Module Built: The scan tool displays the module year built.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.