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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1372 (Automatic Transmission - 2ML70 - DTC P0218 To DTC P0965-P0967) >> DTC P079A >> 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. Verify that DTCs P0721, P0722, P0723, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729, or P2730 is not set.
  2. Perform the Transmission Fluid Check to verify correct fluid level.
  3. Perform the Line Pressure Check to verify correct oil pressure.
  4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection to verify control solenoid valve assembly condition.
  5. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test to verify control solenoid valve assembly function.
  6. Inspect the trans fluid pump ball check valve for possible sticking or damage.
    • If you found a concern with the check ball, repair the concern.
  7. Inspect the hybrid low, 1-2 clutch regulator valve for sticking or damage.
    • If you found a concern with the hybrid low, 1-2 clutch regulator valve, repair or replace the valve or valve body.
  8. Inspect the hybrid low, 1-2 clutch assembly for wear or damage.
    • If you found a hybrid low, 1-2 clutch assembly concern, repair or replace the low and reverse clutch assembly as necessary.
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