Brake Pedal Position Sensors
- Most modern vehicles
Replacing a brake light switch was an easy job not many years ago, replace the old switch with the replacement unit, make a minor adjustment and the brake lights functioned again. On a modern vehicle application, you may need special equipment to perform a re-calibration on the vehicles many control modules so that the new sensor position will be recognized correctly.
The replacement procedure of the brake pedal position sensor (BPP) in a GM vehicle application instructs that following the replacement of the sensor, to perform a re-calibration to the body control module (BCM) and the engine control module (ECM) or hybrid power-train control module (HPCM). A full function diagnostic scan tool, not a trouble code reader, is required to communicate with the control units and place the controllers into a re-calibration mode. Specific steps must be followed in a precise order or the calibration will fail and need to be run again. Failure to perform the re-calibration may cause unintended problems in the operating system and cause warning lights to illuminate on the instrument cluster.
General Motors is not the only vehicle manufacturer to require re-calibrations whenever new components are installed. Always follow the replacement procedure in a repair manual whenever you replace a part on a modern vehicle.