Fault code P0358 – a step-by-step guide to diagnosing and fixing it

Error code P0358 is displayed and the check engine light is on - what does this mean?

The DTC P0358 is recognized by the OBD system when there is a problem in the ignition coil circuit of cylinder 8. This trouble code indicates that the engine control unit has detected a malfunction in the primary or secondary ignition coil circuit of the eighth cylinder. The exact designation may vary for different manufacturers, but the basic meaning of the fault code remains the same.

What causes can this fault code have?

• Defective ignition coil on cylinder 8
• Damaged spark plug in cylinder 8
• Interrupted or damaged wiring to the ignition coil
• Corroded or loose plug connections
• Defective engine control unit (ECM/PCM)
• Short circuit in the ignition coil circuit
• Faulty spark plug connectors or cables
• Mechanical engine problems on cylinder 8

What symptoms occur in parallel with fault code P0358?

• Engine misfiring: Noticeable irregularities in engine running, especially at low engine speeds
• Loss of power: Reduced engine power and poor acceleration
• Increased fuel consumption: The engine operates less efficiently
• Rough idling: Unsteady engine running at idle speed
• Starting problems: Difficulty starting the engine
• Exhaust odor: Unburned fuel in the exhaust gas
• Check engine light: Permanent or flashing display

How can the problem with error code P0358 be rectified?

• Repairing EOBD error code P0358 requires a systematic diagnosis of the ignition system.
• Replace the ignition coil: Replace the defective ignition coil on cylinder 8 with a new original part or an equivalent replacement coil
• Replace spark plug: Replace the spark plug on cylinder 8 and check the electrode gap at the same time
• Repair wiring: Check and repair damaged wiring between the engine control unit and ignition coil
• Clean plug connections: Clean all ignition coil plug connections and treat them with contact spray
• Check engine control unit: Have the ECM/PCM diagnosed by a specialist workshop and replaced if necessary
• Check the entire ignition system: Carry out a comprehensive diagnosis of all ignition components