My 97 Chrysler concorde went into limp mode with the original reading of a map sensor. We changed the sensor and then the computer read incorrect gear ratio. Speed sensors have been tested and work. No other codes showing. Car runs fine but will not shift higher then second gear. Shows no sign of a bad transmission. Have reset computer and tried to retrain TCM but still won't shift out of limp. Can't figure out problem. Has 3.5 V6. Traction Control.