Fault code P0355 – a step-by-step guide to diagnosing and fixing it

Error code P0355 is displayed and the check engine light is on - what does this mean?

The OBD system has detected a fault in the ignition coil circuit of cylinder 5. This DTC (Diagnostic Trouble Code) indicates a problem with the ignition coil, the wiring or the control unit that is affecting the ignition of cylinder 5.

What causes can this error code have?

• Defective ignition coil of cylinder 5
• Damaged or corroded wiring to the ignition coil
• Loose or dirty plug connections
• Defective engine control unit (ECM/PCM)
• Short circuit in the ignition coil circuit
• Faulty spark plug in cylinder 5
• Interruption in the ground cable
• Faulty fuse in the ignition circuit

What symptoms occur in parallel with fault code P0355?

• Engine running unevenly: The engine runs unevenly and jerks when idling
• Power loss: Noticeable reduction in engine power
• Misfiring: Misfiring in cylinder 5
• Increased fuel consumption: Engine runs inefficiently
• Starting problems: Difficulty starting the engine
• Exhaust odor: Unburned fuel in the exhaust gas
• Check engine light: Permanent illumination of the warning light

How to fix the problem of error code P0355?

• The repair requires a systematic diagnosis of the ignition coil circuit of cylinder 5.
• Replace the ignition coil: Replace defective ignition coil of cylinder 5 with a new original coil and clean all plug connections
• Repair wiring: Locate damaged wiring to ignition coil circuit, replace severed or corroded wiring and insulate properly
• Clean plug connections: Disconnect all plugs on the ignition coil circuit, clean with contact spray and firmly reconnect
• Replace spark plug: Check spark plug on cylinder 5 and replace with a new one if worn or damaged
• Check fuses: Check all fuses in the ignition circuit and replace blown fuses
• Diagnose engine control unit: Have ECM/PCM tested for defects and repair or replace if necessary