Unable To Relearn The Brake Pedal Position (BPP) Sensor - keywords calibration C0161 C0278 DTC light lock LX9 P0703 relearn sensor

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Having difficulty performing the Brake Pedal Position (BPP) relearn

If having difficulty performing the relearn on Brake pedal Position (BPP) sensor;

1. Make sure you have the latest calibration in the PCM.
2. Make sure you have the latest Tech-2 Update. (26.010 or higher)
3. Make sure you are NOT pushing on the SERVICE brake when doing the relearn.
4. If the above actions do not allow the relearn, then look at BPP Voltage in the IBCM data list

Information on BPP sensor voltages:

Nominal design voltage with brake pedal not depressed is 1.19 volts. However, there is a defined range of voltages which are allowed to be "learned" as valid with brake pedal at the rest position. In order to learn the BPP sensor, the BPP sensor voltage must fall between: Factory Learn Low =0.88 volts Factory Learn Hi = 1.47 volts

If the vehicle you are working on is outside the noted range, consider potential damage to the BPP sensor.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.