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Super Moderator
2010 DTS
89,123 Posts
P0741 is a common problem in the 2000+ 4T80E transmissions. It is a costly repair, but one you can live without if you are not subjected to emissions testing. The only cost will be a couple of miles per gallon.

The P0741 code will get more frequent until it becomes a daily feature. Clearing it every drive is a PITA, but cheaper than the alternative.

C0660 means that the ELC system is not venting and thus your rear end may be a bit high. Load the trunk and it will put more air into the system to level it, but won't vent and thus get even higher.
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