Circuit/System Verification

WARNING: This page is about a different car, the 2009 GMC Yukon, 2009 Chevrolet Tahoe, and 2009 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for DTCs P0ABB, P0ABC, P0ABD, or any communication U-code DTCs.
- If the specified DTCs are set, repair them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Clear the DTC information.
Ignition OFF for 1 minute.
Ignition ON.
Retest for DTCs P1AEC, P1AED, P1AEE and P1AEF.

If the DTC resets, 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.