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 P0335 OR P0336CIRCUIT/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 key ON and the CKP sensor disconnected, measure the voltage between the 5-volt reference and a good ground and observe that the DMM measures 4.98-5.02 volts.
- If the DMM does not measure 4.98-5.02 volts, test the 5-volt reference for an open, high resistance, or a faulty ECM.
- With the key ON and the CKP sensor disconnected, measure the voltage between the 5-volt reference circuit and the low reference circuit, and observe that the DMM measures 4.98-5.02 volts.
- If the DMM does not measure 4.98-5.02 volts, test the low reference for an open, high resistance, or a faulty ECM.
- With the key ON and the CKP sensor disconnected, connect a fused jumper wire to the signal circuit and momentarily and repeatedly probe the low reference circuit, and observe that the Crank Signal Present and engine RPM parameters change.
- If the crank signal parameter and engine RPM does not change, test the signal circuit for an open, high resistance, a short to ground, a short to voltage, or a faulty ECM.
- Ensure that the CKP sensor circuits are not routed too closely to the fuel injector wiring, aftermarket add-on electrical equipment, solenoids, relays, or motors.
- Inspect the CKP sensor for physical damage, loose or improper installation, excessive air gap, or foreign material passing between the sensor and the reluctor wheel.
- Inspect the CKP reluctor wheel for physical damage, improper installation, or excessive endplay or looseness.
- If no other condition is found, replace the CKP sensor.
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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.