Code Definition

B0249 — Heater/defrost/AC door out of range

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

About B0249

B0249 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 B0249 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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 B0249 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/defrost/AC mode door actuator to position the airflow distribution door inside the heater box and monitors the door's actual position via an internal feedback potentiometer or hall sensor. DTC B0249 is set when the reported feedback position is outside the calibrated allowable range — typically when the door has not reached the commanded stop within a defined time, or the feedback voltage falls below the minimum or above the maximum learned travel limit. Unlike a pure circuit fault, B0249 specifically indicates the door is not where the module expe...

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