Powertrain Codes
P0358
Ignition Coil H Primary/Secondary Circuit Malfunction
★★★★ Common diagnostic code
P0358 means the vehicle control module detected a fault related to ignition coil h primary/secondary circuit malfunction. The code points to the system that needs testing, but the exact repair should be confirmed with scan data, visual inspection, and circuit or mechanical checks.
What P0358 Means
P0358 means the vehicle control module detected a fault related to ignition coil h primary/secondary circuit malfunction. The code points to the system that needs testing, but the exact repair should be confirmed with scan data, visual inspection, and circuit or mechanical checks.
Before You Replace Anything
Record the evidence first. Clearing codes too early can erase the clues that point to the real fault.
Common Symptoms
Most Common Causes
Diagnostic Confidence
Use this as a starting point, not a replacement for testing.
Recommended Diagnostic Workflow
Mechanic's Tips
Save freeze-frame data before clearing codes. Check for related codes, wiring issues, voltage problems, and vehicle-specific service information before replacing the listed component.
Common Mistakes to Avoid
Common Repairs
Replace faulty ignition coil
Success Rate: ★★★☆☆
Average Cost: $120-$900
Labor: 0.5-2.5 hours
Replace worn spark plugs
Success Rate: ★★★☆☆
Average Cost: $120-$900
Labor: 0.5-2.5 hours
Repair coil wiring or connector
Success Rate: ★★★☆☆
Average Cost: $120-$900
Labor: 0.5-2.5 hours
Repair PCM driver issue only after testing
Success Rate: ★★★☆☆
Average Cost: $120-$900
Labor: 0.5-2.5 hours
Parts Commonly Replaced
Tools Used During Diagnosis
Related Repairs
How to Explain This to Your Customer
Your vehicle stored code P0358, which points to a problem with ignition coil h primary/secondary circuit malfunction. We should diagnose the system before replacing parts so the repair is based on testing instead of guessing.
Manufacturer Notes
Generic OBD-II definition. Exact test procedures, component locations, and known failures may vary by make, model, year, engine, and calibration.
Technician Notes
Save freeze-frame data before clearing codes. Check for related codes, wiring issues, voltage problems, and vehicle-specific service information before replacing the listed component.
Related Codes
FAQ
What does P0358 mean?
P0358 means the computer detected a fault related to ignition coil h primary/secondary circuit malfunction.
Is P0358 serious?
It depends on symptoms. Warning lights, poor drivability, overheating, misfires, or transmission problems should be diagnosed quickly.
Can I drive with P0358?
Short trips may be possible if the vehicle runs normally, but avoid driving if the light is flashing, the vehicle overheats, shifts poorly, or loses power.
Will P0358 fail emissions?
Usually yes if the Check Engine Light is on or readiness monitors are incomplete.
Project Atlas Feedback
Was this article helpful?
👎 Needs Improvement
Working on this repair?
Create a professional estimate in minutes.
Editorial Readiness
Reference Chapter Checklist
Why Trust This Guide?
Built by mechanics. Improved by mechanics.
This guide is maintained for working mechanics, mobile technicians, fleet maintenance professionals, and independent repair shops.