Cadillac STS Forum - 2005 through 2010Forum for discussions regarding the new Sigma-based STS model. Not for Cadillac "Seville" discussions (2004 and older).
My STS4 now shifts like a cadillac is supposed to, and like the eight ones I have had before. No more engine surging, rpms bouncing, and indecision when shifting. I cannot express how much better the car drives now. It is night and day difference that the silly dealer could not recognize, I am the one who found and brought them the TSB below and FORCED them to do it.
Anyway Technical Service Bulletin #10017146 will fix your car. The official verbal description from the NHTSA is: TCC surge, shudder, chuggle on light load just after torque converter engagement. Hope this helps those of yoiu who have encountered the same problem.
MODERATOR NOTE: 3456D is the correct TSB number.-Jesda
I always get a giggle out of chuggle. Looked up chuggle and dictionary.com has no mention of it. Even the dealer was laughing at the use of the word chuggle. What a chuckle!
I've been experiencing this problem with my 2006 AWD V8 STS (my 2004 SRX AWD V8 also had same problem). I was thrilled when I read this post identifying a cure in the form of a TSB. Called my dealer, he has no record of the TSB. Called Cadillac Customer Service (1-800-458-8006). THey also have no record of this TSB. How can I have the dealer address the problem if they have no record of this TSB? I referenced this web site, but they don't acknowledge non GM websites (of course). Any suggestions? I would really love to have this taken care of.
Called Cadillac again, got the same answer. They can't do anything until they issue their own TSB. I would love to know how tedasaurus got Cadillac to fix his.
Brought the car into Cadillac today. They applied the fix and the car is now shifting great. It's like a new transmission. Here are the specifics per the tran. tech that worked on my car.
Applied TSB#3456D TCC Int. Chuggle. Doc#1866746. Reprogram TCM, re-test. Ok. This code update was release on 10/12 and this is revision 'D'. The notes specifically address STS4's.
We went for a ride together and this is what we noticed. The torque converter now disengages during deacceleration instead of staying engaged causing the chuggle when accerating(I love that word). Also, the torque converter does not engage on acceleration as early as before. This produces smooth acceleration and shifts. This work was done at Patrick Cadillac in Schaumburg, IL.
I hope this helps identify the fix for everyone. Just have them lookup TSB# 3456D.
Technical Service Bulletin #10017146 will fix your car. The official verbal description from the NHTSA is: TCC surge, shudder, chuggle on light load just after torque converter engagement. Hope this helps those of yoiu who have encountered the same problem.
Do you have any other TSB number for this issue. I called my dealer and gave his the 10017146 and he could not find. He also stated it is not in the correct format for a GM TSB.
The TSB#3456D is the GM number. I watched him pull it up on the computer. You can also search on the document number listed. If all else fails have the technician (not the service advisor) look under the TCC sub heading and search for chuggle. It is in the GM system with a release date of 10/12.
--Automobile Magazine, May 2004
