Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC C012C 00: Regenerative Axle Pressure SensorDTC C121A: Regenerative Axle Pressure Sensor
DTC C12F7: Regenerative Axle Pressure Sensor
DTC C128F: Regenerative Axle Pressure Sensor
DTC C012C 01: Regenerative Axle Pressure Sensor Short to Battery
DTC C12BA: Regenerative Axle Pressure Sensor Short to Battery
DTC C012C 06: Regenerative Axle Pressure Sensor Short to Ground or Open
DTC C12B9: Regenerative Axle Pressure Sensor Short to Ground or Open
DTC C012C 11: Regenerative Axle Pressure Sensor Above Maximum Threshold
DTC C128C: Regenerative Axle Pressure Sensor Above Maximum Threshold
DTC C012C 0F: Regenerative Axle Pressure Sensor Erratic
DTC C12BB: Regenerative Axle Pressure Sensor Erratic
DTC C121A: Regenerative Axle Pressure Sensor
Circuit/System Description
The electronic brake control module (EBCM) uses input from the regenerative axle pressure sensor for more accurate control during a brake and vehicle stability enhancement system (VSES) event. The regenerative axle pressure sensor is internal to the brake pressure modulator valve (BPMV).
Conditions for Running the DTC
| • | Ignition ON. |
| • | Ignition voltage is greater than 10 volts. |
Conditions for Setting the DTC
C012C 00, C128F, C12F7, C121A, C012C 11 or C128C
Internal sensor failure is detected.
C012C 01 or C12BA
A short to battery is detected on the sensor signal circuit.
C012C 06 or C12B9
A short to ground or open is detected signal circuit.
C012C OF or C12BB
Signal is erratic and changes faster than physically allowed.
Action Taken When the DTC Sets
A DIC message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Verify that DTC C012C, C121A, C128C, C128F, C12B9, C12BA, C12BB or C12F7 is not set.
| ⇒ | If DTC is set replace EBCM/brake pressure modulator valve (BPMV) assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
