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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures (B1000 To U1833) >> Diagnostic Information And Procedures >> DTC U1026: Lost Communication With Transfer Case Control Module >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON.
  2. Verify that DTC U0073, U0074, U0075, U0076, U0077, U0078, U2100, U1814, U2099, B1325, B1330, B1370, B1380, B1424, B1428, B1440, B1441, B1517, C0800, C0899, C12E1, P0560, or P0562 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Refer to Circuit/System Testing.
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