Code Definition

B2455 — Aux Heater Blower Faulted

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

About B2455

B2455 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 B2455 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

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 B2455 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 auxiliary heater blower is the combustion and circulation motor inside the auxiliary heater unit that drives air into the burn chamber and on air style heaters delivers heated air to the cabin. The auxiliary heater control module monitors the blower during operation using feedback such as motor current draw, hall effect speed signal, or commutator ripple analysis, depending on the heater design. DTC B2455 is set when the controller detects that the blower has faulted during a heat cycle, meaning the motor speed, current, or response does not match the commanded value within the allowed win...

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