Circuit/System Verification

WARNING: This page is about a different car, the 2014 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

Determine the device that is not communicating. Refer to Control Module U Code List .
Verify that DTC U0073, U2100, U0074, U0078, U1814, U2099, B1325, B1330, B1370, B1380, B1424, B1440, B1441, B1517, C0800, C0899, C12E1, P0560, or P0562 is not set.
- If any of the DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If none of the DTCs are set
Verify that DTC U0125 and DTC U0126 are not set together.
- If both of the DTCs are set together
  Refer to Scan Tool Does Not Communicate with Chassis High Speed GMLAN Device .
- If both of the DTCs are not set together
Refer to Circuit/System Testing.