2011 Chevy Traverse AC Fault Codes B3779-08, B3782-08, B0433-08 Explained | What Does -08 Mean?
I own a 2011 Chevrolet Traverse LT FWD and am experiencing recurring HVAC error codes: B3779-08, B3782-08, and B0433-08. I'd like to understand the significance of the '-08' suffix in all three codes. The air conditioning system functions normally but exhibits short cycling. The dealer has already replaced the compressor due to severe wear, and I believe it's time to return for further diagnosis before further damage occurs. I have cleared the codes multiple times, but they reappear — I suspect they originate from the rear climate control unit. Could a sticking blend door or other HVAC actuator components trigger these error codes? Here are the specific diagnostic trouble codes: - B3779-08: AIR FLOW CONTROL 9 FEEDBACK CIRCUIT SIGNAL INVALID - B3782-08: AIR FLOW 10 FEEDBACK CIRCUIT SIGNAL INVALID - B0433-08: TEMPERATURE CONTROL 3 FEEDBACK CIRCUIT SIGNAL INVALID Any insights into these codes and their root causes would be greatly appreciated.
The rear HVAC unit is likely the source. - DTC B0433-08 relates to the auxiliary air temperature actuator - DTC B3782-08 corresponds to the auxiliary mode actuator - DTC B3779-08 pertains to the mode actuator The '-08' suffix indicates that the actuator has stalled. A physical inspection of the components may be necessary — especially if different climate settings are being selected. A foreign object lodged in the actuator mechanism could be causing intermittent failures. Recommended troubleshooting step: Recalibrate the HVAC system. 1. Remove the HVAC/ECAS fuse from the vehicle's fuse box for at least 10 seconds. 2. Reinstall the fuse. 3. Start the vehicle and wait 40 seconds for the HVAC control module to complete self-calibration. 4. Verify that no new DTCs have been set after recalibration.