P0AC5

Hybrid/EV Battery Temperature Sensor B Circuit

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$33–167 (est.)

Symptoms

Hybrid system power reduction
Malfunction warning on the dashboard
Reducing the range of an electric vehicle
Battery overheating
Incorrect battery temperature readings

Causes

Temperature sensor B fault
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Battery management module malfunction
Wiring harness damage

How to Fix

Check continuity of temperature sensor B circuit
Inspect the connectors and contacts of the sensor
Replace faulty temperature sensor
Check and replace wiring harness if necessary
Test the battery management module

Related codes

P0AC4 P0AC6 P0AC7