Jump to content
CaddyInfo Cadillac Forum

B121 ?? 91 Eldo


Recommended Posts

I get the codes B121 & E048. I know the E048 but I can't find anything on th B121!

B121 - Twilight Enable Switch Circuit. Not much to worry about. I have had B120 and B121 for years. Clean th EGR tubes inside throttle body and you will most likely get rid of E048.

The saddest thing in life is wasted talent

Link to comment
Share on other sites

I already cleaned it and tested the EGR and it is working properly. I replaced the EGR Solenoid yesterday and will see if that ends the E048! The B121 will live on forever.

Link to comment
Share on other sites

E048 can be hard to get rid of. I got it on and off on long trips until I replaced my EGR valve, replacing it also got rid of my detonation. Mike

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...