[mrjoe]

A few things can cause the trans to go into LIMP mode. However Limp mode is not only an "ACTIVE" code (a normal OBD cannot clear or reset) but it is also a code that will remain active even if the problem is resolved. It stays in limp mode until the dealership resets the code through IMPA in the transmission module, not the engine module and wont just go off when the problem is fixed. Many at home DIY people dump money and pull thier hair out for this issue using the "swap and pray" method.

One issue that i had was the crank/ camshaft sensors. If one goes out and is unable to communicate with the other one it will lock the car in LIMP mode.