P1408 — EGR System Flow Out Of Key On Engine Running Self Test Range

What Does P1408 Mean?

P1408 is a manufacturer-specific diagnostic trouble code: EGR System Flow Out Of Key On Engine Running Self Test Range. This code applies to MAZDA, SUZUKI, BUICK, CADILLAC, CHEVY 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 P1408

⚠️ Check Engine Light (MIL) illuminated
⚠️ EGR System Flow Out Of Key On Engine Running Self Test Range not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty EGR System Flow Out Of Key On Engine Running Self Test Range
🔍 Wiring or connector issue in EGR System Flow Out Of Key On Engine Running Self Test Range circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P1408 mean?

P1408 indicates: EGR System Flow Out Of Key On Engine Running Self Test Range. The vehicle's computer has detected that the EGR System Flow Out Of Key On Engine Running Self Test Range is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1408?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1408 for extended periods may cause additional problems.

How much does it cost to fix P1408?

Repair costs for P1408 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 EGR System Flow Out Of Key On Engine Running Self Test Range and related wiring
🔧 Replace faulty EGR System Flow Out Of Key On Engine Running Self Test Range

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.

P1408: EGR System Flow Out Of Key On Engine Running Self Test Range