Code Definition

B0229 — Heater vent air conditioning actuator Circuit malfunction

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About B0229

B0229 is a generic (obd-ii standard) body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B0229 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B0229 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The HVAC control module commands the heater/vent/air conditioning mode actuator to position the mode door inside the heater box, directing airflow between the dash vents, floor outlets and demist ducts. The actuator is a small reversible DC motor with an internal potentiometer or hall sensor that reports door position back to the module. DTC B0229 is a generic circuit-malfunction fault set when the module detects an open, shorted, high-resistance or out-of-range condition on the actuator drive or feedback circuit, or when the door fails to reach the commanded position within the expected curre...

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