Radiator Coolant Temperature Sensor Circuit Range/Performance
The P00B2 code indicates that the Engine Control Module (ECM) has detected a signal from the radiator coolant temperature sensor that is outside the expected range or performance parameters. This sensor monitors the temperature of the coolant exiting the radiator, and the ECM uses this data for cooling fan control, transmission shift points, and other engine management functions. A faulty sensor, wiring issues, or a stuck-open thermostat can cause this code.
01. Most Common Causes
- Faulty radiator coolant temperature sensor
- Open or shorted wiring in the sensor circuit
- Poor electrical connection at the sensor connector
- Stuck-open thermostat causing abnormal coolant temperature
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine overheating or running cooler than normal
- Cooling fans running constantly or not at all
- Poor fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the sensor and wiring for damage or corrosion.
Step 3: Test the sensor resistance and compare to manufacturer specifications.
Step 4: Check the thermostat operation and coolant level.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can lead to engine overheating or improper cooling, which may cause serious engine damage.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150, including parts (sensor) and labor, depending on vehicle make and model.