Conditions for Clearing the DTC
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.
- DTC P279D is a Type A DTC.
- When attempting to set HPCM internal DTCs, run the engine for at least 1 minute, and then shut the engine off for 30 seconds. Following this procedure will allow for a complete HPCM shutdown. Program the HPCM with the latest software version and retest the DTC to see if the DTC resets.