Heavy jerk from transmission and codes U0101 and P1740

Both of those codes could be set if water got into the connection on the transmission. That is what I would hope for as the common CVT issue is internal failure.
To check the connection is simple, The connector has a ring to release it, you rotate it counterclockwise, then pull it out. Look for corrosion or water in the connections. If you see any some contact cleaner sprayed into them might help. If you see nothing then more work looking for issues will be needed.

Not a good sign. That sounds like it could be a bad connection or mechanical in the trans. Because the CVT is a bit touchy to work on I would suggest a shop that works on them as the next step. They will have some test equipment that can run the system through various tests and see what fails. Without that or a high end scan tool there isn't a lot of testing that can be done on them.

It could have depending on how well sealed the module is, however it's not as likely as they are normally very well sealed.

If the vent is missing it could have gotten water in. Not much that could be done if it damaged parts though unless you have the proper tools to test and repair it.

About the only way to test it without a bench full of electronic gear would be to install it then use a scan tool and transmission testing equipment to activate the various parts of the transmission and see what it does in use. The other method would be to get a different module and use it to see if the problem is still there. The CVT is somewhat of a problem to test as internally it is nothing but two adjustable pulleys connected by a metal belt. Any jerking or rough shifts is either faulty electronics or internal damage.

That will depend on if you use a new one or a used unit. The new ones follow one method, while used ones require some extra work to clear them of the old transmissions controls.

New Units-
1. Shift the shift lever to "P" position after replacing TCM.
2. Turn ignition switch ON.
3. Check that the shift position indicator in the dash turns ON

Used TCM or transaxle swap -
1. Turn ignition switch ON after replacing each part.
2. Connect the vehicle with the CONSULT tool.
3. Start engine.
4. Select Data monitor in the Transmission menu.
5. Warm up transaxle assembly until "ATFTEMP COUNT" indicates 47 or more, and then turn ignition switch OFF.
6. Turn ignition switch ON. Do not start the engine.
7. Select "Self Diagnostic Results" in the Transmission menu.
8. Shift the shift lever to "R" position.
9. Depress slightly the accelerator pedal while depressing the brake pedal.
10. Attempt to select "Erase" with step 9.
11. Release brake pedal and accelerator pedal.
12. Turn ignition switch OFF while keeping the shift lever in "R" position.
13. Wait approximately 10 seconds.
14. Turn ignition switch ON while keeping the shift lever in "R" position.
15. Select "Special function" in the Transmission menu.
16. Check that the value on "CALIB DATA" in CONSULT is the same as the data listed in the table attached. Should be all zeros in the values for each calibration.
17. Shift the shift lever to "P" position.
18. Check that the shift position indicator in the dash turns ON.

Hello JADDUN,

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