P20AE — Reductant Metering Unit Temperature Sensor Circuit Low

What Does P20AE Mean?

P20AE is a diagnostic trouble code indicating: Reductant Metering Unit Temperature Sensor Circuit Low. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P20AE

⚠️ Check Engine Light (MIL) illuminated
⚠️ Reductant Metering Unit Temperature Sensor reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Open or broken wire in Reductant Metering Unit Temperature Sensor circuit
🔍 Poor ground connection at Reductant Metering Unit Temperature Sensor
🔍 Faulty Reductant Metering Unit Temperature Sensor with no output signal
🔍 Disconnected or loose Reductant Metering Unit Temperature Sensor connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P20AE mean?

P20AE indicates: Reductant Metering Unit Temperature Sensor Circuit Low. 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 P20AE?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P20AE for extended periods may cause additional problems.

How much does it cost to fix P20AE?

Repair costs for P20AE 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 Metering Unit Temperature Sensor circuit
🔧 Clean and secure Reductant Metering Unit Temperature Sensor connector and ground points
🔧 Replace failed Reductant Metering Unit Temperature Sensor

1
Find your vehicle above
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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.

P20AE: Reductant Metering Unit Temperature Sensor Circuit Low