First thing to try is disconnecting and examining the TCM connector for corrosion. This was reported in a prior thread to fix someone's A/T Aveo problem.

If that doesn't help, then find a shop with a reader capable of reading TCM codes. (hopefully as a minimal cost or N/C) The P0700 is a generic code which indicates specific TCM codes have been set, and those codes often point directly to the specific problem.