P0C91

Hybrid/EV Battery Temperature Sensor J Circuit Intermittent/Erratic

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–56 (est.)

Symptoms

Hybrid system power reduction
Increased fuel consumption
Check Engine Light Illuminates
Reduced battery efficiency
Incorrect battery temperature readings

Causes

Open or short circuit in the sensor circuit
Temperature sensor fault J
Poor contact in the sensor connector
Wiring harness damage
Problems with the hybrid system ECU

How to Fix

Check the continuity of the temperature sensor circuit
Test sensor resistance
Inspect and clean the connector contacts
Check wiring harness for damage
If necessary, replace temperature sensor J

Related codes

P0C90 P0C92 P0C93