What does code B0173 mean?

Q: What does code B0173 mean?

HVAC Air Inlet Door. B0173 indicates that the body control module (BCM) or HVAC control module has detected a fault in the circuit that controls the air inlet door, which is the flap that switches between fresh outside air and recirculated cabin air. The computer monitors the electrical circuit for the actuator motor and sets this code when the voltage or current falls outside the expected range, meaning the door may not move to the commanded position.

DTC codes / B01xx · Airbags, seats, doors, lights and comfort systems / B0173

B0173HVAC Air Inlet Door

B0173 indicates that the body control module (BCM) or HVAC control module has detected a fault in the circuit that controls the air inlet door, which is the flap that switches between fresh outside air and recirculated cabin air. The computer monitors the electrical circuit for the actuator motor and sets this code when the voltage or current falls outside the expected range, meaning the door may not move to the commanded position.

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.

Reading B0173

BBody: airbags, seats, doors, lights and comfort systems.

0Generic (SAE) code: it means the same thing on every OBD-II vehicle.

1Airbags, seats, doors, lights and comfort systems.

73The exact fault within that area.

Often seen with

See it working

How Variable Valve Timing Works: Cam Phaser and VVT Solenoid

Still stuck?

Ask the forum How to read codes