Code Definition

B1272 — Servo Motor Potentiometer Vent Circuit Failure

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

About B1272

B1272 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 B1272 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.

B1272 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 vent mode door servo motor uses an internal potentiometer to provide position feedback to the climate control module, allowing the module to confirm the vent door has reached the commanded position so that air is routed correctly to the dash vents, floor outlets, or windscreen as required. The potentiometer is supplied with a 5V reference voltage, a ground return, and a wiper feedback signal that varies smoothly as the vent door sweeps through its travel. DTC B1272 is a generic vent circuit failure that is set when the climate control module detects the wiper feedback voltage outside ...

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