P20B0: Reductant Metering Unit Temperature Sensor Circuit Intermittent/Erratic

Severity

Low

System

Powertrain

Last reviewed: Jan 1, 0001 Last updated: Jan 1, 0001

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does P20B0 Mean?

P20B0 is a diagnostic trouble code indicating: Reductant Metering Unit Temperature Sensor Circuit Intermittent/Erratic. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P20B0

⚠️ Check Engine Light (MIL) illuminated
⚠️ Reductant Metering Unit Temperature Sensor signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Reduced engine performance

Common Causes

🔍 Loose or intermittent connection at Reductant Metering Unit Temperature Sensor
🔍 Wire chafing causing intermittent contact
🔍 Reductant Metering Unit Temperature Sensor failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P20B0 mean?

P20B0 indicates: Reductant Metering Unit Temperature Sensor Circuit Intermittent/Erratic. 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 P20B0?

Yes, P20B0 is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.

How much does it cost to fix P20B0?

Repair costs for P20B0 typically range from $30 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 reseat all Reductant Metering Unit Temperature Sensor connectors
🔧 Repair chafed or damaged wiring in Reductant Metering Unit Temperature Sensor circuit
🔧 Replace Reductant Metering Unit Temperature Sensor if failing intermittently

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.