2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3314

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3314

* Drive motor generator battery control module (BECM) (RPO HP2) - X 1

* Electronic brake control module (EBCM) - X 1

* Electronic suspension control (ESC) module - X 1

* Fuel pump flow control module (FPCM) - X 1

* Power steering control module (PSCM) (RPO HP2) - X 1

瀚慖f the DTC becomes history, replace the module disconnected before the DTC became history.

Important: If the vehicle is not equipped with RPO HP2 proceed to step 6.

2. Perform the High Voltage Disabling (See: Hybrid Drive Systems/Battery System, Hybrid Drive/Testing and Inspection/Initial Inspection

and Diagnostic Overview/High Voltage Disabling) procedure.

3. Ignition OFF, disconnect harness connector X1 of the BECM.

4. Reconnect the 12-volt battery.

5. Test the BCM for current DTCs. DTC U2099 should remain current.

瀚慖f the DTC becomes history, replace the BECM.

6. Ignition OFF, disconnect the harness connector X 3 at the BCM.

7. With the above harness connectors still disconnected, test for infinite resistance between the high speed GMLAN serial data wake up circuit

terminal 19 and ground.

瀚慖f less than the specified value, test the wake up circuit for a short to ground.

8. If all circuits test normal and DTC is current, replace the BCM.

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 module replacement, setup, and programming

U0073 or U2100

DTC U0073 or U2100

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 Descriptor

DTC U0073 00

- Control Module Communication Bus Off

DTC U0073 71

- ECU HS Bus Off

DTC U0073 72

- ECU LS Bus Off

DTC U2100 00

- Controller Area Network (CAN) Bus Communication

DTC U2100 47

- Controller Area Network (CAN) Bus Communication

Circuit/System Description

The serial data circuits are serial data buses are used to communicate information between the control modules. The serial data circuits also connect

directly to the data link connector (DLC).

Conditions for Running the DTCs