P1039 — Vehicle Speed Signal Missing or Improper

What Does P1039 Mean?

P1039 is a manufacturer-specific diagnostic trouble code: Vehicle Speed Signal Missing or Improper. This code applies to FORD, LINCOLN, MERCURY 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 P1039

⚠️ Check Engine Light (MIL) illuminated
⚠️ Abnormal signal from Vehicle Speed
⚠️ Related system may operate erratically
⚠️ Reduced engine performance

Common Causes

🔍 Vehicle Speed producing abnormal signal
🔍 Electromagnetic interference affecting Vehicle Speed signal
🔍 Wiring issue distorting Vehicle Speed signal

Frequently Asked Questions

What does P1039 mean?

P1039 indicates: Vehicle Speed Signal Missing or Improper. The vehicle's computer has detected that the Vehicle Speed is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1039?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1039 for extended periods may cause additional problems.

How much does it cost to fix P1039?

Repair costs for P1039 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 Vehicle Speed and related wiring
🔧 Replace faulty Vehicle Speed

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.

P1039: Vehicle Speed Signal Missing or Improper