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Home >> GMC >> 2014 >> Terrain Denali, 4D Utility >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U1826 or U1827: Lost Communication with Sensor Module on Powertrain Expansion CAN Bus >> Circuit/System Verification

Circuit/System Verification

  1. Refer to the DTC Descriptors to determine the device that is not communicating.
  2. Verify that DTC U0073, U2100, U0074, U0077, U0078, U1814, U2099, B1325, B1330, B1370, B1380, B1424, B1440, B1441, B1517, C0800, C0899, C12E1, P0560, or P0562 is not set.
    • If none of the DTCs are set 
  3. Verify that DTC U0121 is not set.
    • If the DTC is not set 
  4. Refer to Circuit/System Testing.
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