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 622 (ENGINE CONTROLS AND FUEL - 2.4L - DTC P0420 TO DTC P2544)DTC P1174CIRCUIT/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 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.
- Read and record the Freeze Frame/Failure Records data taking note of the speed and load at which the DTC set.
- Diagnose any other DTCs that are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- With the engine idling and the transmission in the Park or Neutral position, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor parameter should be between 19-42 kPa.
- If the MAP sensor parameter is not between 19-42 kPa, refer to DTC P0106 .
- Inspect the air induction system for modified, damaged, leaking, or restricted components.
- Inspect the crankcase ventilation system for improper operation.
- Inspect the vacuum hoses for splits, kinks, and improper connections.
- Inspect for vacuum leaks at the intake manifold, the throttle body, and the injector O-rings.
- Test for a restricted, damaged, leaking, or modified exhaust system from the catalytic converter forward. Refer to Symptoms - Engine Exhaust .
- Test the fuel injectors for improper operation. Refer to Fuel Injector Diagnosis (w/J39021 or w/Tech 2) or Fuel Injector Diagnosis (w/CH47976) .
- Test for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- Test for excessive fuel in the crankcase due to leaking injectors.
- Test the ignition system for improper operation. Refer to Electronic Ignition (EI) System Diagnosis .
- Test the engine for any mechanical conditions such as sticking valves, lifters, etc., which could alter the flow into the combustion chamber. Refer to Symptoms - Engine Mechanical .
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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.