| Subject: | Various HVAC Concerns And DTCs |
| Models: | 2003-2006 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2003-2006 Chevrolet Avalanche, Suburban, Tahoe |
| 2003-2007 Chevrolet Silverado Classic |
| 2003-2007 GMC Sierra Classic |
| 2003-2006 GMC Yukon and Yukon Denali Models |
This PI is being updated to specify location. Please discard PIT3504C.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment on various HVAC concerns including temperature doors defaulting to full hot position or unable to obtain defrost position. Upon inspection, technicians may find DTCs B0414, B0424, B3770, B0418, B0408, B0263, B0268, and/or B0229
are set.
Recommendation/Instructions:
Check the Right I/P junction block connectors C4, C5, and C8 (Document ID # 1562972) for poor terminal tension, backed out terminals or connectors not fully seated.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
