P2D2A

Hybrid/EV Electronics Coolant Temperature Sensor A/B Correlation

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$22–89 (est.)

Symptoms

The malfunction indicator light comes on
Hybrid system power reduction
Incorrect temperature readings on the dashboard
Activation of emergency operation
Increased noise of the cooling system

Causes

Coolant temperature sensor A or B malfunction
Open or short circuit in the sensor circuit
Poor contact in sensor connectors
Problems with the hybrid system ECU
Low coolant level

How to Fix

Check the level and condition of the coolant
Test resistance and signals of temperature sensors
Inspect wiring and connectors for damage
Replace faulty temperature sensor
Check and, if necessary, update the software of the hybrid system ECU

Related codes

P2D29 P2D2B P0A7F