P2B23

Hybrid/EV Electronics Coolant Temperature Sensor B Circuit High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

Symptoms

Check engine light comes on
Reduced performance of the hybrid system
Possible transition to emergency mode
Incorrect temperature readings in diagnostic equipment

Causes

Coolant temperature sensor B malfunction
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Corroded contacts or damaged wiring
Problems with the hybrid system control unit

How to Fix

Check the integrity of the sensor circuit and the condition of the connectors
Measure sensor resistance at different temperatures
Check reference voltage and sensor signal
If necessary, replace coolant temperature sensor B
Repair only from an authorized dealer

Related codes

P2B24 P2B22 P0A7F