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 387 (ENGINE CONTROL SYSTEM - 3.9L - DTC P0442 TO DTC P2A01)DTC P2077 OR P2078CIRCUIT/SYSTEM TESTING
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
Circuit/System Testing
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Monitor the scan tool for any other DTCs.
- If DTC P0660 is set, diagnose that DTC first. Refer to DTC P0660 .
- Ignition ON, disconnect the IMT valve harness connector and measure for 0.5 volt on the variable tuning signal circuit and ground.
- If less than 0.5 volt, test the variable tuning signal circuit for an open or high resistance, short to ground, or a faulty control module.
- If more than 0.6 volt, test the variable tuning signal circuit for a short to voltage or a faulty control module.
- Measure for 5.0 volts on the IMT fan position signal circuit at the IMT valve harness connector and ground.
- If more than 5 volts, test the IMT fan position signal circuit for a short to voltage.
- If less than 5 volts, test the IMT fan position signal circuit for an open, high resistance, or short to ground.
- If all circuits test OK, replace the IMT valve.
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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.