P0355

The P0355 code signals a problem in the primary or secondary circuit of Ignition Coil E, which serves cylinder 5. This code only applies to engines with 5 or more cylinders, such as inline-5, V6, V8, V10, and similar configurations. The PCM has detected an electrical fault in the coil's control or feedback circuit.

On many V6 and V8 engines, the cylinder 5 coil is located on the rear bank, which can make access more difficult than the front cylinders. Depending on the vehicle, you may need to remove an engine cover, intake manifold components, or other accessories to reach it. This can increase labor costs at a shop, though it's still manageable for a patient DIYer.

As with all ignition coil circuit codes, perform the coil swap test first. Move the suspected coil to an accessible cylinder and see if the code follows. If the coil tests good, inspect the wiring harness carefully — the rear bank wiring on V-engines is exposed to more heat and is more prone to insulation damage. A flashing Check Engine light means active misfires are occurring, so minimize driving until the repair is completed to protect your catalytic converter.

Severity

Symptoms

• •Engine misfires or runs rough
• •Check Engine light is on (may flash)
• •Vibration and roughness at idle
• •Reduced engine power
• •Exhaust smells of unburned fuel
• •Poor fuel economy

Likely Causes

Estimated Cost

Common Fixes

1. Replace the ignition coil for cylinder 5
2. Replace the spark plug for cylinder 5
3. Repair or replace damaged wiring and connectors
4. Swap the coil with another cylinder to confirm diagnosis

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