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• | 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. |
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 connect directly to the data link connector (DLC) for programming purposes.
This diagnostic is used to check the high-speed GMLAN communication bus status.
• | Vehicle ON. |
• | The system voltage is at least 9 V. |
The control module setting the DTC has attempted to establish communications on the serial data circuits for more than 1.4 seconds without success.
The DTC U180B is a type B DTC.
The DTC U180B is a type B DTC.
Diagnosis is accomplished using the symptom. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
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