P1586 — Throttle Control Unit Throttle Position Malfunction

What Does P1586 Mean?

P1586 is a manufacturer-specific diagnostic trouble code: Throttle Control Unit Throttle Position Malfunction. This code applies to FORD, LINCOLN, MERCURY, OTHER, VOLKSWAGEN 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 P1586

⚠️ Check Engine Light (MIL) illuminated
⚠️ Throttle Control Unit Throttle Position not operating correctly
⚠️ Related system in reduced functionality mode
⚠️ Reduced engine performance

Common Causes

🔍 Throttle Control Unit Throttle Position has failed or is degraded
🔍 Wiring or connector issue in Throttle Control Unit Throttle Position circuit
🔍 Related mechanical component affecting Throttle Control Unit Throttle Position
🔍 Software update needed for ECM/PCM

Frequently Asked Questions

What does P1586 mean?

P1586 indicates: Throttle Control Unit Throttle Position Malfunction. The vehicle's computer has detected that the Throttle Control Unit Throttle Position is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1586?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1586 for extended periods may cause additional problems.

How much does it cost to fix P1586?

Repair costs for P1586 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 Throttle Control Unit Throttle Position and related wiring
🔧 Replace faulty Throttle Control Unit Throttle Position

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.

P1586: Throttle Control Unit Throttle Position Malfunction