P00B4

Radiator Coolant Temperature Sensor Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–89 (est.)

Symptoms

Incorrect temperature readings on the dashboard
Engine overheating
Radiator fan does not turn on
Increased fuel consumption
Poor engine idling

Causes

Open circuit in the sensor wiring harness
High resistance in the sensor circuit
Radiator coolant temperature sensor malfunction
Short circuit in the circuit
Problems with the sensor connector
ECU malfunction

How to Fix

Check the condition of the wiring harness and sensor connector
Measure the resistance of the radiator coolant temperature sensor
Check the voltage in the sensor circuit
Replace radiator coolant temperature sensor if necessary
Check and replace wiring harness if necessary
Scan the system for other errors

Related codes

P0113 P0112 P0128