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 MANUALSCHEVROLET2006CHEVY EXPRESS G3500, VAN CARGO, 4.8 VREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 10 (ENGINE CONTROL SYSTEM - 6.6L (LLY) - DTC P0016 TO DTC P0342)DTC P0045CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 V
Circuit/System Testing
2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 VSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- With the ignition OFF for at least 30 seconds, disconnect the TC vane position control solenoid valve.
- Connect the J 34730-405 between the high control and the low reference circuits. See Special Tools .
- With the engine running, command the TC Pos. Ctrl. solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF.
- If the test lamp does not turn ON and OFF, test the high control and low reference circuits for an open, a short to ground, a short to voltage, or a faulty ECM.
- If the test lamp turns ON and OFF, test the high control and low control circuits for high resistance or for a faulty turbocharger solenoid. Refer to Component Testing in this diagnostic.
- With the ECM and TC vane position sensor connectors disconnected, measure for a resistance of less than 3 ohms on the sensor signal circuit.
- If the resistance is over 3 ohms, repair the high resistance or poor connection on the signal circuit.
- Inspect the turbocharger vane control solenoid for debris, damage, or sticking. Refer to Component Testing in this diagnostic.
- If debris, damaged, or a stuck vane position solenoid is verified, replace the turbocharger vane position solenoid.
- Inspect the turbocharger for debris, damage, or sticking vanes. Refer to Turbocharger Cleaning and Inspection
.
- If debris, damaged, or sticking vanes are verified, replace the turbocharger assembly.
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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.