Welcome to 2CarPros.
The code doesn't always mean there is a problem with the main shaft or counter shaft speed sensor. It could be a wiring problem, connection issue, or an internal transmission problem.
Picture 1 shows the location of both aforementioned sensors.
Before replacing one of them, confirm that there is no corrosion at the plug and the wiring seems to be in good condition. Also, make sure transmission fluid is clean and full.
Take care and let me know if you have other questions.
Joe
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Wednesday, March 6th, 2019 AT 2:03 PM