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DTC U180C

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 Descriptor

DTC U180C 00: Battery Charger Control Module High-Speed GMLAN Communication Bus Off

Circuit/System Description

The high-speed GMLAN serial data circuits are serial data buses used to communicate information between the control modules. The high-speed GMLAN serial data circuits also connect directly to the data link connector (DLC) for programming purposes.

Conditions for Running the DTC
    • Supply voltage to the control modules are in the normal operating range.
    • The vehicle power mode requires serial data communications.

Conditions for Setting the DTC

The control module setting the DTC has attempted to establish communication on the high-speed GMLAN serial data circuits more than 3 times.

Action Taken When the DTC Sets

DTC U180C is a type B DTC.

Conditions for Clearing the DTC

DTC U180C is a type B DTC.

Circuit/System Verification

Diagnosis is accomplished using the symptom. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .

   


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