Where is the ECU location
The the ECM (Engine Control Module) became the PCM (Powertrain Control Module). It is located under the air filter box for cooling purposes.
http://www.vadengmpp.com/owners-manual/cadillac/2001-Cadillac-Deville.pdf Chapter 6 Page 68 for fuse
A picture of the ECU on the 2003 Cadillac deville
What is ecu
Guru7N2V, it's basically your cars computer.
Looking for a Used DeVille in your area?
CarGurus has 1,559 nationwide DeVille listings starting at $2,995.
Search Cadillac DeVille Questions
Cadillac DeVille Experts
Related Models For Sale