P0362 Ignition Coil L Primary/Secondary Circuit Malfunction

P0362 indicates an ignition coil L primary or secondary circuit malfunction. The coil L circuit is not behaving as expected during ignition command or feedback monitoring.

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 condemn the PCM driver for P0362 until coil resistance, wiring integrity, shared power, and secondary ignition leakage are tested.

Symptoms of P0362

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 P0362

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

Compare coil L command, primary voltage, ignition supply, ground quality, misfire counters, and freeze-frame conditions when the fault set.
Inspect connector terminals, harness routing, PCM driver circuit, plug condition, boot tracking, coil insulation, and signs of secondary arcing.
Check whether the code follows a moved coil or remains with the coil L wiring and driver path.

Related OBD-II codes

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