P0358 Ignition Coil H Primary/Secondary Circuit Malfunction

P0358 points to an ignition coil H primary or secondary circuit malfunction. It narrows the fault path to coil H and its control circuit.

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 assume the named coil is the only possible fault; connector damage and PCM driver problems can create the same circuit code.

Symptoms of P0358

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 P0358

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

Inspect coil H connector, wiring, power supply, driver-control circuit, and ground path where applicable.
Check misfire counters, coil command, and whether the fault follows the coil if a swap test is appropriate.
Look for heat damage, water intrusion, loose terminals, and secondary ignition tracking around the coil and plug.

Related OBD-II codes

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