Code Definition

B1285 — Servo Motor Potentiometer Airintake Left Circuit Open

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

About B1285

B1285 is a manufacturer-specific body diagnostic trouble code. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1285 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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.

B1285 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 Body Control Module (BCM) or HVAC control module sets this code when it detects an open circuit in the left side air intake mode door servo motor potentiometer feedback circuit. The potentiometer is a three wire device that returns an analogue voltage to the controller indicating the actual position of the left air intake door. With the circuit open the module receives no valid signal and cannot verify door movement between fresh outside air and recirculated cabin air on the driver's side blend. Drivers may notice the recirculate function being unresponsive on the left zone, fogging on the...

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