Circuit/System Verification
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Attempt to communicate with all modules on the high speed GMLAN bus.
- If any high speed module communicates and any DTC beginning with a U exists, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If any high speed module communicates and no DTC beginning with a U exists, refer to DTC U0100-U0299 .