Code Definition

B1291 — Servo Motor Potentiometer Airintake Right Circuit Short To Ground

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

About B1291

B1291 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 B1291 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

B1291 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 right air intake mode door servo motor is part of the HVAC airflow control system and is responsible for switching between fresh outside air and recirculated cabin air on the right side of dual zone climate systems. A potentiometer integrated into the servo motor provides position feedback to the HVAC control module or BCM, returning a variable voltage that corresponds to the actual door position. DTC B1291 sets when the module detects that the potentiometer signal voltage has dropped below the expected lower threshold, indicating a short to ground in the signal circuit, the connector, or ...

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