P0AB4

Hybrid/EV Battery Pack Air Temperature Sensor B Circuit High

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
Incorrect battery temperature readings
Activation of emergency operation

Causes

Battery temperature sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in sensor connectors
Wiring harness damage
Hybrid ECU malfunction

How to Fix

Check the continuity of the temperature sensor circuit
Check resistance and sensor signal
Inspect connectors and wiring for damage
If necessary, replace the temperature sensor
Check and update ECU software

Related codes

P0AB5 P0AB6 P0AB7