B0424 on GMC
Temperature Control Right Feedback Circuit / Actuator Range/Performance
B0424 on GMC vehicles indicates temperature control right feedback circuit / actuator range/performance. Au7o has documented this code across 2 GMC models — most commonly on Sierra 1500, Yukon XL. This is a body/HVAC code indicating the climate control system detected a range or performance problem with the right-side (passenger) temperature blend-door actuator feedback circuit. The blend-door actuator is a small motor that positions a door to mix hot and cold air for the passenger side, and the module monitors a feedback signal to confirm the door reaches commanded positions. The computer saw the actuator failing to move correctly or the feedback signal falling outside the expected range. This is a comfort-related fault and does not affect drivability or safety. Typical repair costs on GMC range from $150 to $900, depending on the specific model and root cause.
Common Causes of B0424
- •Failed passenger-side blend-door temperature actuator motor
- •Stuck, broken, or binding blend door
- •Wiring or connector fault in the actuator feedback circuit
- •Corroded or loose actuator electrical connector
- •Faulty HVAC control module
- •Low or unstable system voltage affecting the actuator
B0424 on GMC by Model
GMC Sierra 1500(1 issue)
- Blend Door / HVAC Actuator Failure Causing Clicking Behind Dash and Incorrect Air Temperature or Mode2000-2013
Sierra owners across both GMT800 and GMT900 generations frequently report small electric HVAC actuators stripping internal gears or losing calibration. The result is a repetitive clicking or tapping noise from the dash, air stuck on defrost or floor, or one side blowing hot while the other blows cold. This is one of the most common non-drivetrain complaints on these trucks and is heavily documented in owner forums and repair databases.
GMC Yukon XL(1 issue)
- Blend Door / HVAC Mode Actuator Failure Causing Incorrect Airflow or Temperature Control2000-2006
Owners frequently report clicking behind the dash, air stuck on defrost or floor, or one side blowing the wrong temperature due to failed HVAC actuators. On Yukon XL models with front and rear climate systems, the mode and blend door actuators can strip gears or lose calibration over time. This is distinct from compressor failure and is a common repair on aging GMT800 SUVs.
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View B0424 across all makes →Frequently Asked Questions
What does B0424 mean on GMC?▼
B0424 stands for "Temperature Control Right Feedback Circuit / Actuator Range/Performance." This is a body/HVAC code indicating the climate control system detected a range or performance problem with the right-side (passenger) temperature blend-door actuator feedback circuit. The blend-door actuator is a small motor that positions a door to mix hot and cold air for the passenger side, and the module monitors a feedback signal to confirm the door reaches commanded positions. The computer saw the actuator failing to move correctly or the feedback signal falling outside the expected range. This is a comfort-related fault and does not affect drivability or safety. On GMC specifically, this code is documented across 2 models.
What causes B0424 on GMC vehicles?▼
Common causes on GMC: Failed passenger-side blend-door temperature actuator motor, Stuck, broken, or binding blend door, Wiring or connector fault in the actuator feedback circuit, Corroded or loose actuator electrical connector, Faulty HVAC control module. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B0424 on a GMC?▼
Repair costs on GMC range from $150 to $900, depending on the specific model and root cause.
Which GMC models have B0424 documented?▼
Au7o has documented B0424 on 2 GMC models: Sierra 1500, Yukon XL.