2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3141

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 3141

Repairs/Wiring Repairs)

Circuit/System Testing

Verify that DTC U0074 is not set.

If the DTC is set, refer to DTC U0074 (See: U Code Charts/U0074)

U180F

DTC U180F

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 U180F

- Control Module Communication Bus B Off

Circuit/System Description

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

circuits also connect directly to the data link connector (DLC) for programming purposes. If this serial data system is inoperative the modules will

still communicate with the scan tool due to other serial data systems but not with each other. Communication with the scan tool for the modules on

the PTLAN bus is through the serial data gateway module (SDGM) on the HSGMLAN serial data system.

Conditions for Running the DTCs

* Supply voltage to the modules are in the normal operating range.

* The ignition switch in any position other than START.

Conditions for Setting the DTC

The module setting the DTC has attempted to establish communications on the PTLAN serial data circuits more than 3 times.

Action Taken When the DTCs Sets

* The module suspends all message transmission.

* The MIL and battery indicators will illuminate, along with several DIC messages.

* The vehicle may continue to run for several minutes, then will stall and not start.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

Circuit/System Verification

Verify that U0074 is not set.

If the DTC is set, refer toDTC U0074 (See: U Code Charts/U0074)

U0181

DTC U0100-U02FF (with HP2)

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.