Code Definition

B1284 — Servo Motor Potentiometer Airintake Left Circuit Failure

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

About B1284

B1284 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 B1284 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.

B1284 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 improper signal from the left side air intake mode door servo motor potentiometer. This may be triggered by an open circuit, erratic voltage readings, or a signal that falls outside the expected operating range of approximately 0V to 5V. The potentiometer provides position feedback for the left air intake door, which on dual zone systems controls the proportion of fresh outside air versus recirculated cabin air supplied to the left side blend. When the controller cannot verify door position, it may default t...

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