Question

1999 Dodge Caravan 3.3L, the code is P1391 what does CMP or CKP means?

Answer 1

Hi there

This code means the computer is losing signal from either the cam or crank position sensors. If one is failing it will lose the signal. Without a scan tool it's difficult to know which of the two is actually causing the issue. You need a scan tool that can read live data from the sensors so you can see which one is dropping out.

Answer 2

P1391 DODGE - CMP or CKP Signal Intermittent Condition

Read more: https://www.autocodes.com/p1391_dodge.html