Code Definition

B108F — Motor for Temperature Flap Actuator Stuck / Feedback Range Fault

System: Body  |  Type: Manufacturer-Specific  |  Make: Volkswagen

About B108F

B108F is a manufacturer-specific body diagnostic trouble code recorded for Volkswagen vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B108F is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

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.

B108F is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Auto HVAC control module (address 08) on Volkswagen vehicles commands the temperature flap motor to reposition the heater and vent blend door based on occupant temperature settings and cabin temperature feedback. DTC B108F is set when the HVAC module commands the actuator to move but the internal position feedback (potentiometer voltage) remains unchanged, reads outside its valid range, or indicates the flap is mechanically stuck, with the fault persisting longer than the module's diagnostic timeout and ignition on with system voltage within the normal 9V to 16V operating window. The tempe...

Join TaT to view the complete code information and diagnostic details.

Quick Facts