P05ED — Reductant Heater Control Module Supply Voltage

What Does P05ED Mean?

P05ED is a diagnostic trouble code indicating: Reductant Heater Control Module Supply Voltage. 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 P05ED

⚠️ Check Engine Light (MIL) illuminated
⚠️ Reductant Heater Control Module Supply Voltage not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Erratic idle speed

Common Causes

🔍 Faulty Reductant Heater Control Module Supply Voltage
🔍 Wiring or connector issue in Reductant Heater Control Module Supply Voltage circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P05ED mean?

P05ED indicates: Reductant Heater Control Module Supply Voltage. The vehicle's computer has detected that the Reductant Heater Control Module Supply Voltage is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P05ED?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P05ED for extended periods may cause additional problems.

How much does it cost to fix P05ED?

Repair costs for P05ED 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 Reductant Heater Control Module Supply Voltage and related wiring
🔧 Replace faulty Reductant Heater Control Module 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.

P05ED: Reductant Heater Control Module Supply Voltage