What Does P00B2 Mean?
The PCM has detected that the radiator coolant temperature sensor is providing readings that are out of the expected performance range for current operating conditions. While the sensor circuit is electrically intact, the reported temperature doesn't make sense given the engine load, vehicle speed, ambient temperature, and engine coolant temperature. This could indicate a sensor accuracy problem or an actual cooling system issue where the radiator outlet temperature is genuinely abnormal.
Common Causes
25%
Degraded or drifted radiator coolant temperature sensor with inaccurate calibration
25%
Thermostat stuck partially open or closed, causing abnormal radiator outlet temperature
20%
Low coolant level or air pocket near the sensor location
15%
Partially clogged radiator reducing cooling efficiency
15%
Intermittent wiring resistance affecting sensor readings
Diagnostic Steps
1
Compare radiator coolant temperature PID to engine coolant temperature PID during normal driving — the radiator outlet should be 15–30°F (8–17°C) cooler than the engine coolant temp. If they are nearly equal, the thermostat may be stuck open. If the radiator temp is higher or the same, there is a circulation issue.
2
With the engine fully warmed up, use an infrared thermometer to measure the actual radiator outlet temperature and compare to the PID reading — a significant discrepancy (more than 10°F) confirms sensor drift.
3
Check coolant level in the reservoir and radiator (when cold) — low coolant or air pockets can cause erratic sensor readings if the sensor tip is not fully submerged.
4
Remove the thermostat and test it in hot water with a thermometer — it should begin opening within a few degrees of its rated temperature (typically 180–195°F) and be fully open approximately 20°F higher.
5
Inspect the radiator for external blockage (debris in fins) and internal flow restriction by feeling for cold spots across the radiator face with the engine at operating temperature.
Estimated Repair Cost
$50 - $400
Parts + labor, varies by vehicle and location
The PCM has detected that the radiator coolant temperature sensor is providing readings that are out of the expected performance range for current operating conditions. While the sensor circuit is electrically intact, the reported temperature doesn't make sense given the engine load, vehicle speed, ...
The most common cause of P00B2 (Radiator Coolant Temperature Sensor Circuit Range/Performance) is: Degraded or drifted radiator coolant temperature sensor with inaccurate calibration
Typical repair costs for P00B2 range from $50 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code could indicate a real cooling system problem (stuck thermostat, clogged radiator) that may lead to overheating. Monitor the temperature gauge closely while driving. If the gauge climbs above normal, pull over immediately to prevent engine damage. Diagnose promptly to rule out a genuine cooling issue.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P00B2 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
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