[99 Neon R/T]

well the only tranny code i could find like that was p 0762 which is shift solenoid circut c stuck on.p0138 is o2 sensor circut high volts bank 1 sensor 2.The wiring harness for the tranny runs down the driver side inside of the frame rail along with the o2 sensorwiring.That may be a good place to start troubleshooting.Check for loose or broken wires.If not you may have a bad valve body and o2 sensor.Good luck I hope it is a quick fix for you