Code Definition

B1274 — Servo Motor Potentiometer Vent Circuit Short To Battery

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

About B1274

B1274 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 B1274 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) 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.

B1274 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 its commanded position to route air 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 full door travel. DTC B1274 is set when the climate control module detects the vent potentiometer wiper feedback voltage rising above its expected operating window in a manner consistent with the signa...

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