P00B5 — Radiator Coolant Temperature Sensor Circuit Intermittent/Erratic

What Does P00B5 Mean?

P00B5 is a diagnostic trouble code indicating: Radiator Coolant Temperature Sensor Circuit Intermittent/Erratic. This code relates to the fuel and air metering system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P00B5

⚠️ Check Engine Light (MIL) illuminated
⚠️ Radiator Coolant Temperature Sensor signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Poor fuel economy

Common Causes

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

Frequently Asked Questions

What does P00B5 mean?

P00B5 indicates: Radiator Coolant Temperature Sensor Circuit Intermittent/Erratic. The vehicle's computer has detected that the Radiator Coolant Temperature Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P00B5?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P00B5 for extended periods may cause additional problems.

How much does it cost to fix P00B5?

Repair costs for P00B5 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 Radiator Coolant Temperature Sensor connectors
🔧 Repair chafed or damaged wiring in Radiator Coolant Temperature Sensor circuit
🔧 Replace Radiator Coolant Temperature Sensor if failing intermittently

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.

P00B5: Radiator Coolant Temperature Sensor Circuit Intermittent/Erratic