P0A9B

Hybrid/EV Battery Temperature Sensor A Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$28–89 (est.)

Symptoms

Hybrid system power reduction
Switching to emergency mode
Dashboard warning light
Unstable operation of the hybrid system
Extended charging time (for PHEV)

Causes

Open or short circuit in the sensor circuit
Battery temperature sensor malfunction
Poor contact in sensor connectors
Wiring harness damage
Problems with the battery management module

How to Fix

Check the integrity of the sensor circuit
Inspect connectors and contacts for corrosion
Test the resistance of the temperature sensor
Replace faulty temperature sensor
Reset the error code and take a test drive

Related codes

P0A9A P0A9C P0A9D