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 380 (ENGINE CONTROL SYSTEM - 3.5L - DTC P0010 TO DTC P0420)DTC P0036, P0054, OR P0141CIRCUIT/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.
- With the engine running at operating temperature, observe the HO2S Heater parameter with a scan tool and manipulate the related wiring and connectors. Manipulation should not affect the parameter.
- If manipulation does affect the parameter then repair the harness or connector.
- With the ignition ON, the engine OFF, and the sensor disconnected, connect a test lamp between the HO2S sensor heater supply voltage circuit and ground. The lamp should illuminate.
- If the lamp does not illuminate then test the voltage supply circuit for high resistance or a short to ground.
- With the ignition OFF, connect a test lamp between the HO2S heater low control circuit and battery voltage. The lamp should not illuminate.
- If the lamp illuminates, test the heater low control circuit for a short to ground or a faulty control module.
- With the engine RUNNING, leave the test lamp connected from the previous step. The lamp should flash or be ON steady.
- If the test lamp is not ON steady or flashing, test the control circuit for a short to voltage or a faulty control module.
- Test for less than 5 ohms resistance in the HO2S sensor heater supply voltage circuit, the heater low control circuit, and the control module.
- If more than 5 ohms, repair the circuit with high resistance, or replace the control module.
- If the ECM and all circuits test normal, replace the HO2S sensor.
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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.