Cadillac CTS First Generation Forum - 2003 - 2007
Obd2 says u0100 loss of communication
Also p0700 detected problem in TCM
Those 2 codes may be related, also it looks like im leaking a little ATF which may explain p0700
However, when i drive the the 06 CTS, when i slow down, the transmission downshifts in an extremely noticeable almost...