P05EF — Reductant Pump Supply Voltage Circuit Low

What Does P05EF Mean?

P05EF is a diagnostic trouble code indicating: Reductant Pump Supply Voltage Circuit Low. 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 P05EF

⚠️ Check Engine Light (MIL) illuminated
⚠️ Reductant Pump Supply Voltage reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Erratic idle speed

Common Causes

🔍 Open or broken wire in Reductant Pump Supply Voltage circuit
🔍 Poor ground connection at Reductant Pump Supply Voltage
🔍 Faulty Reductant Pump Supply Voltage with no output signal
🔍 Disconnected or loose Reductant Pump Supply Voltage connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P05EF mean?

P05EF indicates: Reductant Pump Supply Voltage Circuit Low. 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 P05EF?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P05EF for extended periods may cause additional problems.

How much does it cost to fix P05EF?

Repair costs for P05EF 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

🔧 Repair broken wire or restore ground in Reductant Pump Supply Voltage circuit
🔧 Clean and secure Reductant Pump Supply Voltage connector and ground points
🔧 Replace failed 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.

P05EF: Reductant Pump Supply Voltage Circuit Low