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.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1788 (CRUISE CONTROL SYSTEM)DESCRIPTION AND OPERATIONCRUISE CONTROL DESCRIPTION AND OPERATION (ADAPTIVE CRUISE CONTROL)ADAPTIVE CRUISE CONTROL (ACC) SYSTEM DESCRIPTIONINSTRUMENT PANEL MODULE (IPM)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Instrument Panel Module (IPM)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Instrument Panel Module (IPM)
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
The following are the ACC System functions provided by the IPM:
- The IPM provides a translating gateway for the high speed GMLAN serial data circuit.
- The IPM reads all cruise control switches and the gap switch. The DSCC module monitors a variety of user operated switches from the IPM switch status information sent via the GMLAN serial data circuit.
- The IPM illuminates the brake light based on a GMLAN message from the DSCC module during automatic braking.
- The IPM measures the brake pedal position and sends brake pedal travel status via GMLAN serial data circuit to the ECM. The ECM disengages the ACC System when the brake is applied by the driver pressing the brake pedal.
- The IPM serves as a gateway to the display systems, head-up display (HUD), instrument panel cluster (IPC), driver information center (DIC) and amplifier, visual and audible warnings. The IPM will generate visual and audible warnings based on high speed GMLAN serial data messages from the DSCC module.
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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.