P0C84

Hybrid/EV Battery Temperature Sensor H Circuit High

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Check Engine Light Is On
Hybrid system power reduction
Deterioration in fuel consumption
The battery is overheating
Possible transition to emergency mode

Causes

Battery temperature sensor fault H
Open or short circuit in the sensor circuit
Poor contacts in sensor circuit connectors
Problems with the hybrid control module (HCM)
Corrosion of contacts in the sensor circuit

How to Fix

Check the resistance of the temperature sensor
Diagnose the sensor circuit for opens and short circuits
Check the condition of connectors and contacts
Flash or replace the hybrid system control module if necessary
Replace faulty temperature sensor

Related codes

P0C85 P0C83 P0A7F