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 MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 547 (ENGINE CONTROLS AND FUEL - 3.9L - DTC P0420 TO DTC P3433)DTC P3400CIRCUIT/SYSTEM VERIFICATION
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
Circuit/System Verification
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2007 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Start and idle the engine.
- Allow the engine to reach normal engine operating temperature. The engine should idle smoothly, without any misfires. If the engine misfires, refer to DTC P0300 .
- Monitor the cylinder deactivation system data parameters with a scan tool.
- Road test the vehicle under light throttle and load conditions that will allow the ECM to command V3 mode. If all enabling conditions are met for cylinder deactivation, and if no internal engine hydraulic/mechanical fault conditions are present, the ECM will continue with V3 mode operation.
- If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records Data List.
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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.