Code Definition

B2453 — Aux Heater Blower Fan Circuit Short to Ground

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

About B2453

B2453 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 B2453 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit; and 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 B2453 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 fan is a brushed or brushless DC motor inside the auxiliary heater assembly that draws combustion air into the burn chamber and, on air style heaters, also propels heated air into the cabin. The auxiliary heater control module varies blower speed during the startup, combustion, and post purge phases of the heater operating cycle by commanding the motor through either a low side driver or a PWM control stage. DTC B2453 is set when the controller detects the blower fan circuit shorted to ground, meaning the motor supply line is being pulled to ground voltage with curr...

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