Code Definition

B0145 — Auxiliary heater vent air conditioning actuator Circuit malfunction

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

About B0145

B0145 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 B0145 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 B0145 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 B0145 code relates to the auxiliary (rear or secondary) HVAC system's vent-mode air conditioning actuator circuit. This actuator is a small electric motor with internal position feedback that drives the vent-mode door inside the auxiliary HVAC housing, directing airflow between dash-level vents, floor outlets and defrost outlets for rear passengers. The HVAC control module monitors the actuator's position feedback and motor current draw against its commanded position, and sets B0145 when it detects an electrical fault such as an open circuit, short to power, short to ground, or a feedback ...

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