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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 P079B >> 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 the check ball is stuck or damaged, replace the check ball.
  7. Inspect the hybrid direct, 2-3-4 clutch regulator valve for sticking or damage.
    • If you found a concern with the hybrid direct, 2-3-4 clutch regulator valve, repair or replace the valve or valve body.
  8. Inspect the hybrid direct, 2-3-4 clutch for a slipping or damaged condition.
    • If you found a hybrid direct, 2-3-4 clutch concern, repair or replace the hybrid direct, 2-3-4 clutch assembly as necessary.
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