Question

P1377 code on my Cadillac, what do I change to fix this problem?

Answer 1

HI there

In most cases replacing the crank sensor will resolve the issue. This code is for the 4X crank sensor reference signal. A short or open in the wiring for the crank sensor will cause this code as well.

Answer 2

P1377 CADILLAC - Ignition Control Module Cam Ref Pulse To 4X Ref Pulse Incorrect

Read more: https://www.autocodes.com/p1377_cadillac.html