What does P0358 mean?
The ECM detected a fault in ignition coil H primary or secondary circuit.
Quick Decision Guide
- Faulty ignition coil
- Damaged coil wiring
- Loose connector
When to stop driving
Drive cautiously if the engine runs smoothly. Stop driving if the engine misfires badly or the check-engine light flashes.
Reviewed by ratchit Automotive Solutions for clarity and inspection-first safety framing. Not a substitute for professional diagnosis.
Repair Decision & Cost Guide
Use this guide to decide what to inspect first, what it may cost, and when to move from DIY checks to professional diagnosis.
P0358 is a clue, not a confirmed diagnosis. Inspect simple causes before replacing parts.
DIY vs. Shop
Can you keep driving?
Best first DIY check
Don't replace this first
When to seek a shop
Recommended next action
Estimated Repair Cost
Inspection cost
$0–$25 DIY scanner
Shop diagnostic cost
$80–$150 (typical shop diagnostic fee)
Shop repair cost
$100–$3,500
Diagnostic uncertainty: This code points to a system or condition, not a guaranteed failed part. Inspect before replacing.
Cost variation: Costs vary by vehicle, location, part quality, labor rate, and the confirmed root cause.
Inspect Before Replacing
These checks are cheap, fast, and rule out the most common causes before spending money on parts.
- 1Inspect the coil connector and wiring for damage.
- 2Check for companion cylinder misfire codes.
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Save this issue to My Garage, track what you inspect, and build service history for this vehicle.
V-IQ readiness preview: Medium impact — resolving and tracking this issue may improve your V-IQ readiness. Tracking active codes and resolutions builds a service history we use to estimate V-IQ readiness over time.
Understanding P0358 in detail
P0358 points to an ignition coil primary or secondary circuit fault. The issue may be a failed coil, damaged wiring, a poor connector, a short/open circuit, low voltage, or an ECM coil-driver concern. A coil code can cause misfires, but replacing the coil without checking connector tension, harness damage, and companion misfire data can miss the actual cause.
Symptoms of P0358
- Check engine light
- Rough idle
- Misfire
- Hard start
- Loss of power
- Engine shaking
Common causes
- Faulty ignition coil
- Damaged coil wiring
- Loose connector
- Open or shorted primary circuit
- Spark plug issue
- ECM driver issue
How to diagnose P0358
Steps ordered by urgency — tackle Now items first.
- NowInspect the coil connector and wiring for damage.
- NowCheck for companion cylinder misfire codes.
- SoonInspect the spark plug before condemning the coil.
- SoonVerify coil power and control signal if the fault returns.
- LaterSwap-test coils only when practical and safe.
How to fix P0358
Fixes listed in order of likelihood and cost-efficiency.
- 1Repair coil wiring or connector
- 2Replace failed ignition coil
- 3Replace worn spark plug
- 4Repair power/ground circuit
- 5Advanced ECM driver diagnosis
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Estimated Repair Cost — P0358
Ranges vary by vehicle, region, and shop. Use as a ballpark — always get a quote.
DIY estimate
$10 – $90
Shop estimate
$100 – $300
DIY estimate
$40 – $280
Shop estimate
$200 – $900
DIY estimate
$150 – $1,000
Shop estimate
$600 – $3,500
Cost data is estimated and may not reflect your specific vehicle or location.
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Frequently Asked Questions
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