U063A

Q: Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

Lost Communication With Hybrid/EV Electronics Coolant Temperature Sensor C

High severity

The vehicle bus reports loss of communication with smart HV power-electronics coolant temperature sensor C. Inverter/DC-DC cooling switches to a substitute value; derating may follow.

Common causes

Bus wiring open or shorted
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $130-1320
Module without power or ground
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $130-1320
See all causes + fix costs
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does U063A mean?

U063A means "Lost Communication With Hybrid/EV Electronics Coolant Temperature Sensor C". It is a generic OBD-II code that points to a fault in the network / communication.

What are the most common causes of U063A?

bus wiring open or shorted; module without power or ground; module failed — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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