Post by Marc on Jul 30, 2022 14:03:51 GMT -6
I kept getting a DTC 440 on my 2001 4.0. The cause of it turned out to be a bad gas tank cap. I replaced the cap. No more DTC 440 or check engine light. BTW, this actually happened about 6 months ago.....I wanted to let some time go by before I felt certain that it really was a faulty cap.
