2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 961

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 961

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

1. Verify that DTC U0100, U0121, U0140, or U2099 are not set.

瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

2. Verify that DTC C0035, C0040, C0045, C0050, OR C0131 are not set.

瀚慖f any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).

3. Replace the fuel pump/trailer brake control module.

Repair Instructions

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

Control Module References (See: Testing and Inspection/Programming and Relearning)for fuel pump/trailer brake control module replacement,

setup, and programming

Gasoline With LY6, or Diesel

DTC C0561 (Gasoline With LY6, or Diesel)

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 C0561 F0

- System Disabled Information Stored Invalid Serial Data Received

DTC C0561 F1

- System Disabled Information Stored Invalid Serial Data Received

Circuit/System Description

Diagnostics are used to determine whether or not there is a fault with the brake pressure or wheel speed data being received by the trailer brake

control module (TBCM) over GMLAN serial data.

The loss of serial data brake pressure diagnostic is to determine whether or not there is a fault with the brake pressure data being received over

GMLAN. This diagnostic looks at the brake pressure signal validity and protection value signals over a period of time to determine the fault state of

the brake pressure sensor.

The loss of serial data wheel speed diagnostic is to determine whether or not there is a fault with the wheel speed data being received over

GMLAN. This diagnostic looks at the wheel speed signal validity and sequence number errors over a period of time to determine the fault state

Conditions for Running the DTC

* Ignition ON.

* Ignition voltage is 9.5-17 V.

Conditions for Setting the DTC

* The EBCM diagnoses a fault condition in the master cylinder pressure sensor, and sends a serial data message to the trailer brake control

module.

* The EBCM diagnoses a fault condition in the wheel speed sensors, and sends a serial data message to the trailer brake control module.

* The trailer brake control module losses communication with the EBCM.