P0C42

Hybrid/EV Battery Pack Coolant Temperature Sensor A Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–56 (est.)

Symptoms

Check Engine Light Is On
Reduced performance of the hybrid system
Error message on the dashboard
The battery is overheating
Reduced power or range (for electric vehicles)

Causes

Coolant temperature sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in sensor connectors
Wiring harness damage
Problems with the hybrid system control module

How to Fix

Check the integrity of the sensor circuit
Inspect the connectors and contacts of the sensor
Check the resistance of the temperature sensor
Replace the faulty sensor if necessary
Reset error code after repair

Related codes

P0C43 P0C44 P0C45