Question

I got the engine code P1645 on my 1997 Cadillac DeVille 4.6L, what is the meaning?

Answer 1

Hi there,

This code indicates an issue with the Evaporative emission vent solenoid. Here is a list of possible causes.

P1645 CADILLAC - Evaporative Emission Purge Solenoid Output Circuit
Read more: https://www.autocodes.com/p1645_cadillac.html