U063A

Lost Communication With Hybrid/EV Electronics Coolant Temperature Sensor C

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine light comes on
Reduced performance of the hybrid/electric system
Incorrect coolant temperature readings
Possible problems with cooling components
Reduced power or transition to emergency mode

Causes

Open or short circuit in the sensor circuit
Coolant temperature sensor malfunction
Connector problems or contact corrosion
Hybrid/Electric ECU malfunction
Interference in the electrical circuit

How to Fix

Check the continuity of the temperature sensor circuit
Inspect connectors and contacts for damage or corrosion
Check the functionality of the temperature sensor
Scan the ECU for additional errors
If necessary, replace the sensor or repair the circuit

Related codes

U0638 U0639 U063B