B0263 on GMC
Air Flow Control 6 Circuit
B0263 on GMC vehicles indicates air flow control 6 circuit. Au7o has documented this code across 1 GMC model — most commonly on Acadia. General Motors body code. "Air Flow Control 6" is the formal GM/SAE name; in practice on most applications it is the HVAC mode (air direction) door actuator, and it is common on 2003-2011 full-size trucks and SUVs (Silverado, Sierra, Suburban, Tahoe, Avalanche, TrailBlazer, Envoy). Each air door actuator is a stepper motor with an internal potentiometer that reports shaft position back to the HVAC control module; the code sets when the actual reported position does not match the commanded position, or the actuator fails its calibration sweep. The usual symptom is air coming out of the wrong vents - most often stuck on defrost regardless of the setting. It does not affect how the engine runs and will not turn on the check engine light. Which physical door "6" refers to varies by application, so confirm against the service information for the specific year and model. Typical repair costs on GMC range from $120 to $450, depending on the specific model and root cause.
Common Causes of B0263
- •Failed HVAC door actuator (stripped internal gears or failed potentiometer)
- •Binding or broken air door inside the HVAC case
- •Failed recalibration after a battery disconnect or replacement
- •Open, shorted, or chafed wiring in the actuator circuit
- •Corroded or loose actuator connector
- •Faulty HVAC control module (less common)
B0263 on GMC by Model
GMC Acadia(1 issue)
- HVAC Blend Door Actuator Gear Stripping — Clicking Dash and Cold Air on One Side Only2007-2021
The dual-zone HVAC case uses several small plastic-geared blend/mode door actuators. The gear teeth strip or the door binds, so the actuator hunts for its calibration position and produces a repetitive clicking or ticking from behind the dash or glovebox. The classic complaint is full heat on the driver's side and ice-cold air on the passenger's side (or the reverse), often with the click audible whenever the temperature setting is changed or the ignition is cycled. It is one of the most common non-powertrain complaints on the Acadia across both generations because every part of the actuator drivetrain is plastic.
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View B0263 across all makes →Frequently Asked Questions
What does B0263 mean on GMC?▼
B0263 stands for "Air Flow Control 6 Circuit." General Motors body code. "Air Flow Control 6" is the formal GM/SAE name; in practice on most applications it is the HVAC mode (air direction) door actuator, and it is common on 2003-2011 full-size trucks and SUVs (Silverado, Sierra, Suburban, Tahoe, Avalanche, TrailBlazer, Envoy). Each air door actuator is a stepper motor with an internal potentiometer that reports shaft position back to the HVAC control module; the code sets when the actual reported position does not match the commanded position, or the actuator fails its calibration sweep. The usual symptom is air coming out of the wrong vents - most often stuck on defrost regardless of the setting. It does not affect how the engine runs and will not turn on the check engine light. Which physical door "6" refers to varies by application, so confirm against the service information for the specific year and model. On GMC specifically, this code is documented across 1 model.
What causes B0263 on GMC vehicles?▼
Common causes on GMC: Failed HVAC door actuator (stripped internal gears or failed potentiometer), Binding or broken air door inside the HVAC case, Failed recalibration after a battery disconnect or replacement, Open, shorted, or chafed wiring in the actuator circuit, Corroded or loose actuator connector. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B0263 on a GMC?▼
Repair costs on GMC range from $120 to $450, depending on the specific model and root cause.
Which GMC models have B0263 documented?▼
Au7o has documented B0263 on 1 GMC model: Acadia.