bschelle Posted March 5, 2006 Report Share Posted March 5, 2006 I get the codes B121 & E048. I know the E048 but I can't find anything on th B121! Link to comment Share on other sites More sharing options...
adallak Posted March 5, 2006 Report Share Posted March 5, 2006 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 More sharing options...
bschelle Posted March 6, 2006 Author Report Share Posted March 6, 2006 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 More sharing options...
BodybyFisher Posted March 6, 2006 Report Share Posted March 6, 2006 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 More sharing options...
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