Code 23 is "2-4/OD Pressure Switch Circuit"
The Transmission system uses three pressure switches to monitor the fluid pressure in the L-R, 2-4, and OD elements. The pressure switches are continuously monitored-for the correct states in each gear.
This code is set if the 2-4 and OD pressure switches are either open or closed at the wrong time in a given gear. This indicates that both the 2-4 and OD pressure switches indicated the wrong state at the time the fault was set.
For more information, check the factory manual (no information in the Chilton's manual) or subscribe online at:
http://www.alldatadiy.com.