Code Definition

B1268 — Servo Motor Potentiometer Defrost Circuit Failure

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

About B1268

B1268 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 B1268 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.

B1268 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 climate control module monitors the position of the defrost mode door using a potentiometer built into the defrost servo motor. The module supplies a 5V reference and ground to the potentiometer, then reads a wiper voltage that varies with door angle. DTC B1268 is set when the module sees a feedback wiper voltage that is stuck at 0V (short to ground), pulled to the full 5V reference (open circuit or short to reference), or that fails to change as the servo is commanded to drive the door. The defrost door directs HVAC airflow up to the windscreen vents, so when this code is set the demister...

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