Code Definition

B1273 — Servo Motor Potentiometer Vent Circuit Open

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

About B1273

B1273 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 B1273 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.

B1273 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 air is routed correctly to the dash, floor, or windscreen outlets. The potentiometer is supplied with a 5V reference voltage, a ground return, and a wiper feedback signal that varies smoothly across the door full travel. DTC B1273 is set specifically when the climate control module detects an open circuit on the potentiometer feedback path, typically seen as a wiper voltage that floats h...

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