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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 14 (ENGINE CONTROLS - 2.0L - DTC P0351 TO DTC P2138)DIAGNOSTIC INFORMATION & PROCEDURESDTC P0351-P0354CIRCUIT/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 variant/trim than selected.
  1. Turn OFF the ignition.
  2. Disconnect the ECM.
    3. IMPORTANT: A high resistance on any IC circuit can cause a misfire before the DTC sets.
  3. Test the affected IC circuit for an open, a high resistance, a short to ground and for a short to voltage.
    • If a fault is found, repair the circuit as needed.
  4. Connect the ECM.
  5. Exchange the affected ignition coil/module with the ignition/coil module of a good cylinder.
  6. Start the engine and observe the scan tool.
    • If the DTC or the misfire transfers with the suspect ignition/coil module, replace as needed.
    • If the DTC or the misfire does not transfer with the suspect ignition/coil module, 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.