P0360 Ignition Coil J Primary/Secondary Circuit Malfunction

P0360 indicates an ignition coil J primary or secondary circuit malfunction. The fault may involve coil J power, control, feedback, secondary output, or related wiring.

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 coil J based only on the code name; verify the primary and secondary sides before ordering parts.

Symptoms of P0360

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 P0360

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 J command, primary circuit activity, ignition feed voltage, ground integrity, misfire counters, and freeze-frame conditions.
Inspect coil J wiring, connector terminals, PCM driver path, spark plug gap, boot condition, secondary arcing, water intrusion, and shared coil supply faults.
Use circuit testing and controlled swap testing to determine whether the coil, plug, harness, or driver circuit is responsible.

Related OBD-II codes

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