C0278

DTC C0278

Circuit Description

The brake pedal position sensor (BPP) is a potentiometer. The electronic brake control module (EBCM) supplies a 5-volt reference circuit and low reference circuit to the BPP sensor. The BPP sensor signal circuit is a direct input to the EBCM. The EBCM determines the BPP based on the voltage from the BPP sensor. The EBCM converts the BPP sensor feed back voltage to a digital signal and puts it on the class 2 communication bus.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C0278 Brake Pedal Position Sensor Not Calibrated

Conditions for Running the DTC

* The EBCM must be powered.
* This test is run continuously.

Conditions for Setting the DTC

* The BPP sensor calibration procedure has never been performed.
* The last BPP sensor calibration was unsuccessful.

Action Taken When the DTC Sets

When DTC C0278 is set the following will occur:

* The engine drive control is disabled.
* The panic brake assist is disabled.
* The traction control system is disabled.
* The vehicle stability enhancement system is disabled.
* The service vehicle soon lamp will illuminate.

Conditions for Clearing the DTC

* The current DTC will clear when the fault is no longer present.
* A history DTC clears after 100 consecutive ignition cycles in which no faults have occurred.
* Clear the DTC with a scan tool.

Test Description

Step 1 - Step 6:

The number below refers to the step number on the diagnostic table.
2. This step calibrates the brake position sensor.