P0C99

Hybrid/EV Battery Temperature Sensor L Circuit Low

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$28–94 (est.)

Symptoms

Hybrid system power reduction
Check Engine Light Illuminated
Error messages on the instrument panel
Reduced battery efficiency
System transition to emergency mode

Causes

Open or short circuit in the temperature sensor circuit
Faulty battery temperature sensor
Poor connection or corroded connectors
Damage to the wiring harness near the battery
Battery management module (BMS) malfunction

How to Fix

Visual inspection of the temperature sensor wiring and connectors
Checking the resistance and voltage in the sensor circuit
Checking the correctness of sensor readings using a diagnostic scanner
Replacing a faulty temperature sensor
Repair or replace damaged wiring

Related codes

P0C98 P0C9A P0AFA