U1811

DTC U1811

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC U1811 00

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Battery Energy Control Module Powertrain Expansion CAN Bus Off

Circuit/System Description

The powertrain high speed GMLAN serial data circuits are serial data buses used to communicate information between the control modules.

This diagnostic is used to check the powertrain high speed GMLAN communication bus status.

Conditions for Running the DTC

* The ignition is ON.

* The system voltage is greater than 8.8 V.

Conditions for Setting the DTC

The control module setting the DTC has attempted to establish communications on the serial data circuits for more than 1.4 seconds without success.

Action Taken When the DTC Sets

The DTC U1811 is a type B DTC.

Conditions for Clearing the DTC

The DTC U1811 is a type B DTC.

Circuit/System Verification

Verify that DTC U0074 is not set.

If the DTC is set, refer to DTC U0074 (Mid Speed or Chassis Expansion Bus) Data Communications (Mid Speed or Chassis Expansion Bus)DTC U0074 (Powertrain Expansion Bus) Data Communications (Powertrain Expansion Bus).