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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1381 (Automatic Transmission - 2ML70 - DTC P0971 To DTC P279D) >> DTC P0973 or P0974 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine ON, verify the transmission fluid temperature is between 50-80°C (122-176°F).
  2. Operate the vehicle with the transmission in M1 range long enough to verify at least a 3°C (5°F) rise in TCM temperature parameter, then operate the vehicle in Park for 5 seconds.
  3. Engine ON, observe the scan tool Shift Sol. 1 CKT Status parameter. The reading should display OK or Indeterminate.
    • If the reading is not within the specified range, replace the control solenoid valve assembly.
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