Circuit/System Verification
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that DTC U1814, U2099, B1428, B1370, B1380, B1440, or B1441 is not set.
- If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Verify that at least 1 control module that communicates on high speed GMLAN serial data communicates with the scan tool.
- If no control module communicates on high speed GMLAN serial data, refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
- Verify that at least 1 control module, excluding BCM, that communicates on low speed GMLAN serial data communicates with the scan tool.
- If no control module communicates on low speed GMLAN serial data, excluding BCM, refer to Scan Tool Does Not Communicate with Low Speed GMLAN Device .