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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1534 (HYBRID ENGINE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0A2B-P0A2D OR P0A31-P0A33CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the transmission X176 24-way harness connector.
- Ignition ON, test the vehicle harness side for less than 8 ohms between the low reference circuit terminal and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PIM.
- Ignition ON, verify the scan tool motor temperature sensor parameter is greater than 4.42V.
- If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the PIM.
- Install a 3-amp fused jumper wire between the signal circuit terminal and the low reference circuit terminal. Verify the scan tool motor temperature sensor parameter is less than 0.29V.IMPORTANT: If a short to voltage is found, test the motor temperature sensor for damage.
- If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PIM.
- Connect the DT-48493
to the X176 transmission 24-way connector at the transmission. See Special Tools . Measure and record the resistance between the sensor signal and low reference terminals. Compare the actual sensor and circuit resistance to the expected sensor resistance. Refer to Temperature Versus Resistance .
- If the resistance is near the expected value, test the transmission internal harness signal circuit for a short to ground. If the circuit tests normal, replace the drive motor w/generator.
- If the resistance is not near the expected value, test the transmission internal harness signal and low reference circuits for an open or shorted together condition. If the circuits test normal, replace the drive motor w/generator.
IMPORTANT:
The ignition must be ON to test the low reference circuit. Other DTCs will set with the X176 connector disconnected.
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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.