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 G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 959 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - DTC P029D TO DTC P1448)DTC P0698 OR P0699CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Circuit/System Testing
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Savana Special, 2007 GMC Savana Camper Special, 2007 GMC Savana, and 2007 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
- Turn OFF the ignition for 60 seconds or until the ECM powers down.
- Disconnect the accelerator pedal position (APP) sensor.
- Turn ON the ignition, with engine OFF and measure the voltage from the 5-volt reference circuit of the APP sensor 1 to a good ground with a DMM.
- If the voltage measures 4.7-5.2 volts, replace the APP sensor.
- With the DMM still connected to the 5-volt reference circuit, disconnect all other components connected to the 5-volt reference 3, one at a time. Refer to Diagnostic Fault Information above.
- If voltage changes when one of the above components are disconnected, replace the component. Refer to the appropriate replacement procedure.
- Test the 5-volt reference 3 circuits for a short to ground or a short to voltage.
- If no problem was found in the 5-volt reference 3 circuit, replace the ECM.
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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.