One problem related to ignition switch has been reported for the 2007 Cadillac STS. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Cadillac STS based on all problems reported for the 2007 STS.
Engine randomly stops running while car is going at high speeds or low speeds. Engine will restart and travel for various distances before occuring again. This problem has been reported on many 2007 cadilacs and gm has made a recall on all 2007 cadilacs except the Sts model ! it uses the same ignition switch as the other models. Very dangerous situation if another car is behind.