P0CA8

Hybrid/EV Battery Temperature Sensor M Circuit

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–89 (est.)

Symptoms

Check Engine light comes on
Hybrid system power reduction
Reduced efficiency and range
Battery error message on display
Incorrect operation of the battery cooling system

Causes

Open or short circuit in sensor wiring
Faulty temperature sensor (thermistor)
Poor electrical connection or connector corrosion
Battery Management Module (BMS) internal failure
Damage to the wiring harness near the battery compartment

How to Fix

Visual inspection of the sensor wiring and connectors for damage and corrosion
Checking the resistance and reference voltage on the sensor circuit
Comparing the readings of a faulty sensor with the working ones in the system
Replacing a faulty temperature sensor
Clearing error codes and performing a test run

Related codes

P0CA5 P0CA6 P0CA7 P0CA9