DTC C0880, C12E5, or C120F. Cadillac Escalade

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2008 🢒 Escalade - 2WD 🢒 Brakes 🢒 Antilock Brake System - Hybrid 🢒 DTC C0880, C12E5, or C120F

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 C0880 00: Device Voltage Reference Output Circuit

DTC C12E5: Device Voltage Reference Output Circuit

DTC C0880 02: Device Voltage Reference Output Circuit Short to Ground

DTC C120F: Device Voltage Reference Output Circuit Short to Ground

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5-Volt Reference	C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D, C0880 00, C12E5, C0880 02, C120F	C0277 03, C129A, C129D, C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D	C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D, C0880 00, C12E5	C0277 5A, C12B1, C12F8, C120C
Brake Master Cylinder Piston Position Sensor Signal Terminal 35	C0277 03, C129A, C129D	C0277 03, C129A, C129D, C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D	C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D, C0880 00, C12E5	C0277 5A, C12B1, C12F8, C120C
Brake Master Cylinder Piston Position Sensor Signal Terminal 9	C0277 03, C129A, C129D	C0277 03, C129A, C129D, C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D	C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D, C0880 00, C12E5	C0277 5A, C12B1, C12F8, C120C
Low Reference	C0294 00, C120C, C12F8, C0161 04, C127D, C0880 00, C12E5, C0455 39	--	--	C0277 5A, C12B1, C12F8, C120C

Circuit/System Description

The electronic brake control module (EBCM) supplies a shared 5 volt reference to the brake master cylinder piston position sensor, steering angle sensor and brake master cylinder piston position sensor.

Conditions for Running the DTC

•	Ignition ON.

•	The ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

The EBCM detects the voltage on the 5 volt reference circuit to the brake master cylinder piston position sensor, steering angle sensor and brake master cylinder piston position sensor is less than 4.8 volts or greater than 5.2 volts.

Action Taken When the DTC Sets

•	The EBCM disables the antilock brake system (ABS), traction control and the vehicle stability enhancement system (VSES) for the duration of the ignition cycle.

•	A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

•	The condition for 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

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

Verify DTC C0455 is not set.

⇒	If DTC is set, refer to DTC C0455.

Verify DTC C0277 is not set.

⇒	If DTC is set, refer to DTC C0277, C120C, C129A, C129B, C129D, C129E, C12B1, or C12F8.

Ignition OFF, disconnect the harness connector at the electronic brake control position sensor.
Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.

⇒	If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup, and programming