P0C40

DC/DC Converter Temperature Sensor B High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine light comes on
Hybrid system power reduction
The car goes into emergency mode
Possible problems with charging a 12V battery
Disabling some electrical functions

Causes

Faulty temperature sensor B DC/DC converter
Problems with cooling the DC/DC converter (radiator clogged, fan not working)
Malfunction of the DC/DC converter itself
Wiring problems (open or short circuit in sensor circuit)
Overheating due to excessive load on the electrical system

How to Fix

Check the temperature sensor readings with a scanner
Inspect the cooling system of the DC/DC converter
Check the integrity of wiring and connectors
Test or replace temperature sensor B
If necessary, replace the DC/DC converter

Related codes

P0C41 P0C42 P0C43