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Circuit/System Verification

  1. Determine the control module that is not communicating. Refer to Control Module U Code List .
  2. Verify that DTC U1814, U2099, B1428, B1370, B1380, B1440, or B1441 is not set.
  3. Engine running for 10 seconds.
  4. Ignition ON, engine OFF, verify that DTC U0100-U0299 is not set with symptom byte 00.
  5. Verify that DTC U0100-U0299 is not set with symptom byte 71 or 72.
    • If the DTC U0100-U0299 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-U0299 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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