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
Module Information-Software Version: This displays the 3-digit number of the software version used on the OnStar® VCIM.
Module Information Hardware Version: This displays the 1-digit number of the hardware version used on the OnStar® VCIM.
Module Information- Julian Date Of Build: This displays the day of the year the module was built.
Module Information-Year Module Built: This displays the year the module was built
Module Information-8-Digit GM Part Number: This displays the part number for the VCIM.
Module Information-Component Serial #8: This is the first partition of the serial number.
Module Information-Component Serial #12: This is the second partition of the serial number.
Module Information-Component Serial #13: This is the third partition of the serial number.
VCI Module Station Identification Number (STID): This is the station identification number stored in the VCIM which is used by the OnStar® Call Center
Module ID: This displays the version of OnStar® which the vehicle is equipped with.
Electronic Serial Number (ESN): This is the electronic serial number stored in the VCIM which is used by the OnStar® Call Center
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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.