P1479 — Transmission Fan Relay Circuit Open Or Shorted

What Does P1479 Mean?

P1479 is a manufacturer-specific diagnostic trouble code: Transmission Fan Relay Circuit Open Or Shorted. This code applies to DODGE, JEEP, OTHER, FORD, LINCOLN 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 P1479

⚠️ Check Engine Light (MIL) illuminated
⚠️ No signal from Transmission Fan Relay
⚠️ Related system defaulting to backup values
⚠️ Reduced engine performance

Common Causes

🔍 Broken wire in Transmission Fan Relay circuit
🔍 Disconnected Transmission Fan Relay electrical connector
🔍 Transmission Fan Relay internal open circuit failure
🔍 Corroded terminal pins preventing electrical contact

Frequently Asked Questions

What does P1479 mean?

P1479 indicates: Transmission Fan Relay Circuit Open Or Shorted. The vehicle's computer has detected that the Transmission Fan Relay is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1479?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1479 for extended periods may cause additional problems.

How much does it cost to fix P1479?

Repair costs for P1479 typically range from $30 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

🔧 Locate and repair broken wire in Transmission Fan Relay circuit
🔧 Replace damaged Transmission Fan Relay connector
🔧 Replace Transmission Fan Relay if internally open

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.

P1479: Transmission Fan Relay Circuit Open Or Shorted