P0C45

Hybrid/EV Battery Pack Coolant Temperature Sensor A Circuit High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine Light Is On
Hybrid system power reduction
Battery overheating
Switching to emergency mode
Increased fuel consumption (for hybrids)

Causes

Coolant temperature sensor malfunction
Open or short circuit in wiring
Poor contact in the sensor connector
Problems with the hybrid system control module
Contact corrosion

How to Fix

Check the integrity of the wiring and connectors
Measure the resistance of the temperature sensor
Check for errors in the hybrid system control module
Replace temperature sensor if necessary
Clean corrosion from contacts

Related codes

P0C46 P0C47 P0C44