Folding Top Diagnostic Tips
When servicing power folding top conditions, it’s important to understand the operation of the power top and how to diagnose issues.
Check for any folding top-related messages in the Driver Information Center, and operate the folding top to determine where it stops moving.
Use a scan tool to monitor each folding top position sensor and switch, and compare the parameters to the matrix.
Identify any incorrect parameters, and determine if the condition is a mechanical issue or an electrical issue.
Other Diagnostic Tips
Park Assist Control Module may fall off CAN bus when other control modules are serviced on some 2020 CTS models.
V8 Engine Vibration Condition at 1,200 RPM may occur on some 2019-2020 Silverado 1500 and Sierra 500 models.
GM ToolNet Application is a new service tool for GM Dealerships to help organize and manage special service tools inventory.
Manual:
Download: TECHLINK 2020 GMC Diagnostic Manual
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