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DTC U180A

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 U180A 00: Electric A/C Compressor Control Module High-Speed 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
    • The system voltage is greater than 10.25 V.
    • 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 U180A is a type B DTC.

Conditions for Clearing the DTC

DTC U180A is a type B DTC.

Circuit/System Verification

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

   


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