P05F0 — Reductant Pump Supply Voltage Circuit High

What Does P05F0 Mean?

P05F0 is a diagnostic trouble code indicating: Reductant Pump Supply Voltage Circuit High. This code relates to the vehicle speed and idle control system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P05F0

⚠️ Check Engine Light (MIL) illuminated
⚠️ Reductant Pump Supply Voltage reading stuck at maximum value
⚠️ Related system operating erratically or in default mode
⚠️ Erratic idle speed

Common Causes

🔍 Short to voltage in Reductant Pump Supply Voltage wiring harness
🔍 Corroded or water-damaged Reductant Pump Supply Voltage connector
🔍 Faulty Reductant Pump Supply Voltage outputting maximum voltage
🔍 Damaged wiring rubbing against metal components
🔍 ECM/PCM internal fault (rare)

Frequently Asked Questions

What does P05F0 mean?

P05F0 indicates: Reductant Pump Supply Voltage Circuit High. The vehicle's computer has detected that the Reductant Pump Supply Voltage is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P05F0?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P05F0 for extended periods may cause additional problems.

How much does it cost to fix P05F0?

Repair costs for P05F0 typically range from $20 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 and repair Reductant Pump Supply Voltage wiring for short to voltage
🔧 Clean or replace corroded Reductant Pump Supply Voltage connector
🔧 Replace faulty Reductant Pump Supply Voltage

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.

P05F0: Reductant Pump Supply Voltage Circuit High