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 1628 (HYBRID CONTROLS - 3.6L (HP5) - DTC P16F9 TO DTC P2797)DTC P183FCIRCUIT/SYSTEM TESTING
2010 GMC Savana G2500, Van Cargo Extended, 6.6 6
Circuit/System Testing
2010 GMC Savana G2500, Van Cargo Extended, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect the transmission X176 20-way connector. Ignition ON. The scan tool Direction IMS parameter should display HIGH for the R1, R2, D1, D2 and S signal circuit displays.
- If a signal displays LOW, disconnect the PIM connector X1 and test the circuit for a short to ground.
- If the circuit tests normal, replace the PIM.
- Install J 44152:
jumper harness to the vehicle harness connector X176. Verify that a test lamp illuminates between the Direction IMS switch ground circuit and battery positive.
- If the test lamp does not illuminate, disconnect PIM connector X1 and test the ground circuit for an open, high resistance or short to voltage condition.
- If the circuit tests normal, replace the PIM.
- Connect a 3-amp fused jumper wire between each Direction IMS signal circuit at J 44152:
jumper harness and the ground circuit terminal. The scan tool parameter should display LOW for each signal circuit when grounded.
- If a scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition.
- If the circuit tests normal, replace the PIM.
- Disconnect the transmission 16-way X175 connector. Install DT-47825-10:
Jumper Harness to the vehicle harness. Connect a 3-amp fused jumper wire between the Starter signal circuit terminal and ground. The scan tool parameter should display LOW when the signal circuit is grounded.
- If the scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition.
- If the circuit tests normal, replace the PIM.
- Disconnect the IMS connector at the switch.
- Test the direction signal circuits and the ground circuit between the IMS and the transmission 20-way X176 connector for a short to ground, open, high resistance or short to voltage condition.
- Test the Starter signal circuit between the IMS and the transmission 16-way X175 connector for a short to ground, open, high resistance or short to voltage condition. The TCM is a pass-through of the Starter signal circuit and should be tested as a typical circuit path.
- If the circuit, including the TCM, tests normal, replace the IMS switch.
NOTE: Connect one end of the J 44152: jumper harness to the transmission connector. Use the other end as the terminal testing point.NOTE: Connect one end of the DT-47825-10: Jumper Harness to the transmission connector. Use the other end as the terminal testing point.
NOTE:
The remaining diagnostic steps test the internal transmission components and circuits. The automatic transmission fluid pan assembly must be removed in order to perform the diagnostic tests.
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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.