Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for DTC P1AC6 or any communication DTCs.
- If the specified DTCs are set, repair them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Program the PIM with the latest software version and recheck for DTCs.
- If the DTC resets after programming or if the PIM already contains the latest software version, replace the PIM.