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 952 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LLY) - DTC P0016 TO DTC P0341)DTC P0299CIRCUIT/SYSTEM VERIFICATION
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Circuit/System Verification
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Verification
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2007 GMC Savana Special, 2007 GMC Savana Camper Special, 2007 GMC Savana, 2007 Chevrolet RV Cutaway, and 2007 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that DTCs P003A, P0045, P0698, P0699, P2563, P2564 or P2565 are not set.
- If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Verify the integrity of the entire air induction and turbocharger pipes and hoses by inspecting for the following conditions:
- Any damaged components
- Loose or improper installation
- Wet or restricted air filter
- Exhaust leaks before the turbocharger
- Exhaust restrictions after the turbocharger
- In cold climates, inspect for snow or ice build-up at the air cleaner, MAF sensor, and MAP sensor.
- Engine running, use a scan tool to command the TC Vane Pos. Ctrl. Solenoid ON.
- Perform a snapshot of the engine data while slowly increasing the engine speed to 1,700 RPM, and then back to idle. Refer to Scan Tool Snapshot Procedure .
- Plot the snapshot and verify that the MAP sensor parameter increases smoothly as the engine speed is increased and decreased smoothly as the engine speed is returned to idle.
- If the MAP parameter plot slope is not a straight line with even RPM change, replace the MAP sensor.
- Engine running, observe the DTC information with a scan tool. DTC P0299 should not set.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame Records data.
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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.