P0358
PowertrainIgnition Systemhigh severityIgnition Coil H Primary/Secondary Circuit Malfunction
What P0358 Means
The PCM detected a fault in the primary or secondary circuit of ignition coil H (cylinder 8). A faulty coil will cause that cylinder to misfire.
Symptoms
- Engine misfire
- Rough running
- Check engine light on
Common Causes
- Faulty ignition coil
- Damaged coil wiring or connector
- Poor coil ground
- Failed PCM coil driver
Diagnostic Steps
- Scan for related misfire codes
- Inspect coil H connector and wiring
- Swap coil H with another cylinder to test
- Measure coil primary/secondary resistance
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