Aux Heater Blower Faulted
Your vehicle's auxiliary heater blower motor isn't working properly, like a fan that won't spin when you flip the switch. The engine control unit detected an electrical fault or mechanical failure in the blower circuit.
The ECU monitors the auxiliary heater blower motor's current draw and operational feedback through a relay circuit. It detects open circuits, shorts, stalls, or resistance values outside normal operating range during heater activation.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Blower Motor Current Draw | 2-8 amps during operation | Below 0.5A or above 15A, or no response |
| Circuit Voltage | 12-14.5V at blower connector | Below 10V or intermittent voltage |
Code B2455 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B2455 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.