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Home >> GMC >> 2011 >> Yukon Base, 5.3 3 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Automatic Transmission - 2ML70 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0976 or P0977 >> Circuit/System Verification

Circuit/System Verification

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  1. Engine ON, verify the transmission fluid temperature is between 50-80°C (122-176°F).
  2. Operate the vehicle in 4th gear long enough to verify at least a 3°C (37°F) rise in TCM temperature parameter, then operate the vehicle in Park for 5 seconds.
  3. Engine ON, observe the scan tool Shift Sol. 2 CKT Status parameter. The reading should display OK or Indeterminate.
    • If the reading is not within the specified range, replace the Q8 control solenoid valve assembly.
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