C0890 07 GMC Acadia I

The BCM detects a short to voltage in the brake position sensor 5-volt reference circuit.

Action Taken When the DTC Sets

1. The Service Vehicle Soon indicator is commanded ON.
2. If the DTC sets while the vehicle is running, the BCM will activate the brake lights when the vehicle transmission is not in the PARK position and the vehicle is not accelerating.
3. For DTC C0277 4B, the stop lamps may not activate at the expected brake pedal positions.

Conditions for Clearing the DTC

1. For DTC C0277 4B, a successful brake pedal position sensor calibration has been performed.
2. A DTC will not clear the current status until the next ignition cycle.
3. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Diagnostic Aids

The stop lamps will not illuminate unless the ignition is in the ON position.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

1. «Circuit Testing»(ref-365275-S00040570812010070600000)
2. «Connector Repairs»(ref-365275-S19060558252010070600000)
3. «Testing for Intermittent Conditions and Poor Connections»(ref-365275-S00287822652010070600000)
4. «Wiring Repairs»(ref-365275-S21384576672010070600000)

Scan Tool Reference

Control Module References for scan tool information