P1407 — EGR Air Intrusion In Exhaust Supply To EGR Valve

What Does P1407 Mean?

P1407 is a manufacturer-specific diagnostic trouble code: EGR Air Intrusion In Exhaust Supply To EGR Valve. This code applies to BUICK, CADILLAC, CHEVY, CHRYSLER, GM 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 P1407

⚠️ Check Engine Light (MIL) illuminated
⚠️ EGR Air Intrusion In Exhaust Supply To EGR Valve not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty EGR Air Intrusion In Exhaust Supply To EGR Valve
🔍 Wiring or connector issue in EGR Air Intrusion In Exhaust Supply To EGR Valve circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P1407 mean?

P1407 indicates: EGR Air Intrusion In Exhaust Supply To EGR Valve. The vehicle's computer has detected that the EGR Air Intrusion In Exhaust Supply To EGR Valve is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1407?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1407 for extended periods may cause additional problems.

How much does it cost to fix P1407?

Repair costs for P1407 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 Air Intrusion In Exhaust Supply To EGR Valve and related wiring
🔧 Replace faulty EGR Air Intrusion In Exhaust Supply To EGR Valve

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.

P1407: EGR Air Intrusion In Exhaust Supply To EGR Valve