Diesel goes into pre heat mode

[LI Guy]

My 2017 diesel goes into preheat mode no matter the outside temps.It used to do this below 40 degrees f. Now I have to used the button start twice to get her going,if I don't she will start after a few moments..Any answers? Batteries are 2 years old.

 

[AH64ID]

The temp that triggers the WTS light is 66° in the intake.

If it happens above that, such as on a warm engine restart, then it could be the IAT sensor… but the ECM does monitor sensors for comparable readings on cold soaked motors.

 

[H3LZSN1P3R]

Intake air temp sensor is usually the issue but hook a scanner to it and see what the IAT sensor is reading before the truck is started. If its above 66° or atleast close to ambient outside temps then its not the issue