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IgnitionCritical⚠️ Professional Recommended

P0358

Ignition Coil H Primary/Secondary Circuit

Fault in ignition coil H (cylinder 8 on V8 engines).

SeverityCritical
CategoryIgnition
Est. Repair Cost$75–$250
Code TypePowertrain
DIY RepairProfessional

⚡ Common Causes

  • ›Failed coil H
  • ›Wiring fault
  • ›Heat damage

⚠️ Symptoms

  • ›Cylinder 8 misfire
  • ›Rough running
  • ›Check engine light

✅ How to Fix — Step by Step

  • Step 1:Swap coil to verify
  • Step 2:Replace coil H
  • Step 3:Inspect wiring for heat damage

🔧 Diagnostic Tools Required

Using the correct diagnostic tools helps identify the root cause of P0358 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Cylinder 8 coil failures on truck V8s often come with P0308 misfire code — address both together.

Repair Cost Estimate

Full Repair Estimate
$75–$250
DIY Possible?
PRO
Severity
Critical

Frequently Asked Questions

What does OBD2 code P0358 mean?+
P0358 stands for Ignition Coil H Primary/Secondary Circuit. Fault in ignition coil H (cylinder 8 on V8 engines).
What causes code P0358?+
Failed coil H; Wiring fault; Heat damage
How do I fix code P0358?+
Swap coil to verify; Replace coil H; Inspect wiring for heat damage
How much does it cost to fix P0358?+
Estimated repair cost for P0358 is $75–$250.
Is P0358 DIY-friendly?+
P0358 typically requires professional equipment and a qualified mechanic.

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