What does code B0255 mean?

Q: What does code B0255 mean?

HVAC Air Temperature External Sensor Circuit. B0255 indicates that the body control module (BCM) or HVAC control module has detected an out-of-range signal on the circuit for the external air temperature sensor, which is used to measure ambient air temperature for climate control and display. The computer sets this code when the sensor voltage falls outside the expected range, typically indicating an open circuit, short to ground, or short to power.

DTC codes / B02xx · Airbags, seats, doors, lights and comfort systems / B0255

B0255HVAC Air Temperature External Sensor Circuit

B0255 indicates that the body control module (BCM) or HVAC control module has detected an out-of-range signal on the circuit for the external air temperature sensor, which is used to measure ambient air temperature for climate control and display. The computer sets this code when the sensor voltage falls outside the expected range, typically indicating an open circuit, short to ground, or short to power.

SystemBody

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaAirbags, seats, doors, lights and comfort systems

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.