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Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Determine the control module that is not communicating. Refer to Control Module U Code List .
  2. Verify that DTC U0073, U2100, U0074, U0078, U1814, U2099, B1325, B1330, B1370, B1380, B1424, B1428, B1440, B1441, B1517, C0800, C0899, C12E1, P0560, or P0562 is not set.
  3. Engine running for 10 seconds.
  4. Ignition ON, engine OFF, verify that DTC U0100-U02FF is not set with symptom byte 00.
    • If the DTC U0100-U02FF is set with symptom byte 00, refer to Circuit/System Testing.
  5. Verify that DTC U0100-U02FF is not set with symptom byte 71 or 72.
    • If the DTC U0100-U02FF is set with symptom byte 71 or 72 along with other DTCs set, diagnose all other codes first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
    • If the DTC U0100-U02FF is set with symptom byte 71 or 72 and without other DTCs set, reprogram the control module. If the DTC resets, replace the control module.
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