OBD-II code · Powertrain (generic)
P00B2 Radiator Coolant Temperature Sensor Circuit Range/Performance
Radiator coolant sensor reading implausible compared to engine coolant or expected behavior. The engine coolant temperature sensor feeds warm-up enrichment, fan control and closed-loop entry — a stuck-cold reading keeps the engine in open loop and rich forever.
Is it safe to drive with P00B2?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyThermostat stuck open
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Radiator Coolant Temp Sensor, Thermostat
Related codes
- P00AFTurbocharger/Supercharger Boost Control A Module Performance
- P00B0Turbocharger/Supercharger Boost Control B Module Performance
- P00B1Radiator Coolant Temperature Sensor Circuit
- P00B3Radiator Coolant Temperature Sensor Circuit Low
- P00B4Radiator Coolant Temperature Sensor Circuit High
- P00B5Radiator Coolant Temperature Sensor Circuit Intermittent/Erratic
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.