2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 918

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 918

Primary Piston Position Sensor A parameter is greater than 4.5 V.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the EBCM.

6. Verify the scan tool BMC Primary Piston Position Sensor B parameter is less than 1 V.

瀚慖f greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the EBCM.

7. Install a 3A fused jumper wire between the signal circuit terminal 1 and the 5 V reference circuit terminal 2. Verify the scan tool BMC

Primary Piston Position Sensor B parameter is greater than 4.5 V.

瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the EBCM.

8. If all circuits test normal, replace the brake master cylinder piston position sensor. If DTC resets, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Brake Master Cylinder Primary Piston Position Sensor Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction Control

Systems/Braking Sensor/Switch/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for EBCM replacement, setup, and programming

Brake Pedal Position Sensor 3 Not Plausible

DTC C0277, C120C, C129A, C129B, C129D, C129E, C12B1, or C12F8

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC C0277 03

- BMC Primary Piston Position Sensor A and B Circuit Performance Voltage Below Threshold

DTC C129A

- Brake Pedal Position Sensor 3 Circuit Low

DTC C129D

- Brake Pedal Position Sensor 4 Circuit Low

DTC C0277 07

- BMC Primary Piston Position Sensor A and B Circuit Voltage Above Threshold

DTC C129B

- Brake Pedal Position Sensor 3 Circuit High

DTC C129E

- Brake Pedal Position Sensor 4 Circuit High

DTC C0277 5A

- BMC Primary Piston Position Sensor A and B Circuit Plausibility Failure

DTC C12B1

- ABS Master Cylinder Pressure Sensor and Brake Pedal Position Sensor Not Plausible

DTC C12F8

- Brake Pedal Position Sensor 3 Not Plausible

DTC C120C

- Brake Pedal Position Sensor 4 Not Plausible