Code Definition

B1277 — Servo Motor Potentiometer Foot Circuit Open

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

About B1277

B1277 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 B1277 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.

B1277 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 on the foot mode door servo motor's internal position potentiometer signal. The potentiometer normally returns a variable voltage between approximately 0.5V and 4.5V to report the actual position of the foot mode door, which routes cabin airflow toward the floor outlets. An open in the signal wire, reference supply, ground return, or inside the potentiometer itself causes the signal to read 0V or be pulled to 5V reference with no response to commanded door movement, and the controller cannot con...

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