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 VARIANT/TRIMSECTION 5 (ENGINE CONTROLS - 2.0L - TROUBLESHOOTING & DIAGNOSIS)
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
Section 5 (Engine Controls - 2.0L - Troubleshooting & Diagnosis)
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Section 5 (Engine Controls - 2.0L - Troubleshooting & Diagnosis)
WARNING: This page is about a different variant/trim than selected.
- Symptoms - Engine Controls
- Intermittent Conditions
- Hard Start
- Surges/Chuckles
- Lack of Power, Sluggishness, or Sponginess
- Detonation/Spark Knock
- Hesitation, Sag, Stumble
- Cuts Out, Misses
- Poor Fuel Economy
- Poor Fuel Fill Quality
- Rough, Unstable, or Incorrect Idle and Stalling
- Dieseling, Run-On
- Backfire
- Malfunction Indicator Lamp (MIL) Inoperative
- Malfunction Indicator Lamp (MIL) Always On
- Engine Cranks but Does Not Run
- Powertrain Relay Diagnosis
- Supercharger Intercooler Relay Diagnosis
- Fuel Pump Electrical Circuit Diagnosis
- Fuel System Diagnosis
- Fuel Injector Diagnosis (w/CH47976)
- Fuel Injector Diagnosis (w/J39021 or w/Tech 2)
- Fuel Injector Coil Test
- Fuel Injector Balance Test with Special Tool
- Fuel Injector Circuit Diagnosis
- Fuel Tank Leak Test
- Alcohol/Contaminants-in-Fuel Diagnosis (w/o Special Tool)
- Alcohol/Contaminants-in-Fuel Diagnosis (w/Special Tool)
- Boost Control System Diagnosis
- Electronic Ignition (EI) System Diagnosis
- Inspection/Maintenance (I/M) System Check
- Inspection/Maintenance (I/M) Complete System Set Procedure
- Inspection/Maintenance (I/M) System DTC Table
- Inspection/Maintenance (I/M) Catalyst System Set Procedure
- Inspection/Maintenance (I/M) Evaporative Emission (EVAP) System Set Procedure
- Inspection/Maintenance (I/M) Heated Oxygen Sensor/Oxygen Sensor (HO2S/O2S) System Set Procedure
- Inspection/Maintenance (I/M) Heated Oxygen Sensor (HO2S) Heater System Set Procedure
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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.