P0AC9

Hybrid/EV Battery Temperature Sensor B Circuit Intermittent/Erratic

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$17–89 (est.)

Symptoms

Check Engine light comes on
Reduced performance of the hybrid system
Incorrect battery temperature readings
Reduced vehicle power
Errors in the battery management system

Causes

Temperature sensor B fault
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Wiring harness damage
Problems with the battery management module

How to Fix

Check continuity of temperature sensor B circuit
Inspect connectors and contacts for corrosion or damage
Check the resistance of the temperature sensor
Scan the battery management module memory for additional errors
If necessary, replace temperature sensor B

Related codes

P0AC8 P0ACA P0ACB