Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2010SAVANA G2500, VAN CARGO EXTENDED, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1506 (AUTOMATIC TRANSMISSION - 2ML70 - DTC P0218 TO DTC P0965-P0967)DTC P079DCIRCUIT/SYSTEM VERIFICATION
2010 GMC Savana G2500, Van Cargo Extended, 6.6 6
Circuit/System Verification
2010 GMC Savana G2500, Van Cargo Extended, 6.6 6SECTION 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.
- Verify that DTCs P0721, P0722, P0723, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729, or P2730 are not set.
- If the DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Perform the Transmission Fluid Check to verify correct fluid level.
- Perform the Line Pressure Check to verify correct oil pressure.
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection to verify control solenoid valve assembly condition.
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test to verify control solenoid valve assembly function.
- Inspect the trans fluid pump ball check valve for possible sticking or damage.
- If you found a concern with this check ball, repair the concern.
- Inspect the hybrid low, 1-2 clutch boost valve assembly for sticking or damage.
- If you found a concern with the hybrid low, 1-2 clutch boost valve assembly, repair or replace the valve or valve body.
- Inspect the 1-3 clutch assembly for a slipping or damaged condition.
- If you found a 1-3 clutch assembly concern, repair or replace the 1-3 clutch assembly as necessary.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.