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 P2444CIRCUIT/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 DTCs P0411, P0418, P2432 or P2433 are set, perform those diagnostics first.
- Engine running, command the AIR pump relay ON and OFF with a scan tool. Verify that the AIR pump turns ON and OFF with each command.
- If the AIR pump does not turn ON, the pump may have been damaged by continuous operation. Test or replace the AIR pump. Then, test the AIR pump voltage supply circuit for a short to voltage. If the circuit tests normal, test the AIR pump relay control circuit for a short to ground. If the circuits test normal, test the AIR pump relay. If all circuits and AIR pump relay test normal, replace the engine control module (ECM).
- If the AIR pump does not turn OFF, test the AIR pump voltage supply circuit for a short to voltage. If the circuits test normal, test the AIR pump relay control circuit for a short to ground. If all circuit test normal, test the AIR pump relay. If all circuits and the AIR pump relay test normal, replace the ECM.
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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.