P1358 — Ignition Diagnostic Monitor Signal Out of Self-Test Range

What Does P1358 Mean?

P1358 is a manufacturer-specific diagnostic trouble code: Ignition Diagnostic Monitor Signal Out of Self-Test Range. This code applies to FORD, LINCOLN, MAZDA, MERCURY, BUICK vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1358

⚠️ Check Engine Light (MIL) illuminated
⚠️ Abnormal signal from Ignition Diagnostic Monitor
⚠️ Related system may operate erratically
⚠️ Reduced engine performance

Common Causes

🔍 Ignition Diagnostic Monitor producing abnormal signal
🔍 Electromagnetic interference affecting Ignition Diagnostic Monitor signal
🔍 Wiring issue distorting Ignition Diagnostic Monitor signal

Frequently Asked Questions

What does P1358 mean?

P1358 indicates: Ignition Diagnostic Monitor Signal Out of Self-Test Range. The vehicle's computer has detected that the Ignition Diagnostic Monitor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1358?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1358 for extended periods may cause additional problems.

How much does it cost to fix P1358?

Repair costs for P1358 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect Ignition Diagnostic Monitor and related wiring
🔧 Replace faulty Ignition Diagnostic Monitor

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1358: Ignition Diagnostic Monitor Signal Out of Self-Test Range