Question

What causes the P1377 code and how do I fix it on my 1996 Cadillac ElDorado?

Answer 1

Hi there

This code is for the Ignition control module ref pulse to 4X ref pulse incorrect.

In most cases replacing the crank position sensor will resolve this issue.

Answer 2

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

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