Technical Service Bulletin N222375000 — 2020 GMC SIERRA 1500
VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM
Bulletin Details
| TSB ID | N222375000 |
| Manufacturer | |
| Vehicle | 2020 GMC SIERRA 1500 |
| Component | VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM |
| Communication Date |
Bulletin Summary
In certain vehicles, equipped with a manual HVAC system (RPO: C4P), the K33 HVAC Control Module may not properly enable the heater auxiliary coolant pump to maintain cabin heater temperature during engine auto stop events. Reprogram the K33 HVAC Control Module with updated software.
About Technical Service Bulletins
A Technical Service Bulletin (TSB) is a document issued by a vehicle manufacturer to its dealers, describing a known issue with a specific vehicle or set of vehicles and the recommended procedure to fix it. Unlike recalls, TSBs are not mandatory and are typically only performed if an owner reports the related issue. However, TSBs can be an indicator of common problems with a vehicle.