P0355 Ignition Coil E Primary/Secondary Circuit Malfunction

P0355 points to an ignition coil E primary or secondary circuit malfunction. The affected coil circuit should be tested before assuming a normal tune-up issue.

Code details

Generic OBD-II · P0

System: Ignition / Misfire
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the coil without checking the driver circuit and connector; wiring faults can set the same code.

Symptoms of P0355

Rough idle, shaking, or a stumble under acceleration.
A flashing check-engine light during an active misfire.
Power loss and higher fuel consumption.

Common causes of P0355

Worn spark plugs, ignition coils, or plug wires.
Fuel-delivery problems — injectors, pressure, or a lean/rich mixture.
Vacuum leaks, low compression, or a mechanical fault in that cylinder.

Useful checks before replacing parts

Check coil E power feed, driver-control circuit, ground path, connector fit, terminal tension, and harness routing.
Compare misfire data and coil command with neighboring cylinders before moving or replacing parts.
Inspect for oil, water intrusion, cracked insulation, or secondary ignition leakage at the coil and plug.

Related OBD-II codes

These nearby ignition / misfire entries can help compare wording and pin down the fault area.