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 621 (ENGINE CONTROLS AND FUEL - 2.2L (L61) - DTC P0420 TO DTC P2544)DTC P0506 OR P0507CIRCUIT/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 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
- If there are any other DTCs set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
- Compare the desired engine idle speed to the actual engine idle speed with a scan tool. Actual engine idle speed should be no greater than or less than 100 RPM of desired RPM.
- Command the engine speed up and down with a scan tool. Increase the engine speed in 25 RPM increments while comparing the desired engine speed to the actual engine speed. The actual engine speed should stay within 25 RPM of the desired engine speed.
- Inspect for any condition that can reduce idle speed by increasing engine load.
- Incorrect torque converter clutch (TCC) operation
- Accessories that require additional torque to operate
- Excessive deposits in the throttle body-Refer to Throttle Body Cleaning .
- Restricted exhaust-Refer to Restricted Exhaust .
- Mechanical conditions that limit engine speed
- Inspect for any condition that can increase idle speed.
- Vacuum leaks
- Unmetered air entering the engine after the mass air flow
- A faulty positive crankcase ventilation (PCV) 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.