P00B2 Radiator Coolant Temperature Sensor Circuit Range/Performance

The radiator coolant temperature sensor is an NTC thermistor that measures coolant temperature on the radiator side, typically at the radiator outlet; the exact position depends on the manufacturer. Together with the engine coolant temperature sensor it gives a second measuring point, which the control module uses to diagnose the thermostat and coolant flow, for example on engines with an electrically heated map-controlled thermostat. P00B2 is a plausibility or range fault: the signal is electrically valid but does not fit the operating state, for example because it is stuck at one value. No manufacturer description naming this exact code was found; the exact logic is manufacturer-specific.

Likely causes

Symptoms

• Check engine light on
• Thermostat and coolant flow diagnostics are suspended
• Often no noticeable symptoms

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, en.wikipedia.org, en.wikipedia.org.