Code Definition

B1280 — Servo Motor Potentiometer Coolair Circuit Failure

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

About B1280

B1280 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 B1280 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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.

B1280 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 invalid or out of range signal from the cool air mode door servo motor's internal position potentiometer. The cool air door (often referred to as the blend or temperature door) controls how much air bypasses the heater core to regulate cabin temperature, and the potentiometer reports the actual door position back to the controller as a variable voltage typically between 0.5V and 4.5V referenced to a 5V supply. The code sets when the signal falls outside the expected range, when the voltage does not change in...

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