Code Definition

B1289 — Servo Motor Potentiometer Airintake Right Circuit Open

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

About B1289

B1289 is a manufacturer-specific body diagnostic trouble code recorded for Ford vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

When B1289 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.

B1289 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 HVAC control module, in some vehicles integrated with the Body Control Module (BCM), monitors the position of the right air intake mode door using a potentiometer mounted in the servo motor assembly. The potentiometer is fed a 5V reference voltage and returns a feedback signal that varies with door position, typically between 0.5V at one end of travel and 4.5V at the other. DTC B1289 sets when the module detects an open circuit on the potentiometer signal path, which can be caused by a broken wire, an unseated connector, or a failed wiper inside the servo, all of which leave the module wit...

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