P20AC — Reductant Metering Unit Temperature Sensor Circuit

What Does P20AC Mean?

P20AC is a diagnostic trouble code indicating: Reductant Metering Unit Temperature Sensor Circuit. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P20AC

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Reductant Metering Unit Temperature Sensor readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in Reductant Metering Unit Temperature Sensor circuit (damaged, chafed, or corroded)
🔍 Faulty Reductant Metering Unit Temperature Sensor connector or terminal
🔍 Failed Reductant Metering Unit Temperature Sensor
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P20AC mean?

P20AC indicates: Reductant Metering Unit Temperature Sensor Circuit. The vehicle's computer has detected that the Reductant Metering Unit Temperature Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P20AC?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P20AC for extended periods may cause additional problems.

How much does it cost to fix P20AC?

Repair costs for P20AC 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 and repair Reductant Metering Unit Temperature Sensor wiring and connectors
🔧 Replace faulty Reductant Metering Unit Temperature Sensor

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.

P20AC: Reductant Metering Unit Temperature Sensor Circuit