Heavy jerk from transmission and codes U0101 and P1740

Tiny
JADDUN
  • MEMBER
  • 2012 NISSAN SENTRA
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I recently had to drive my car listed above CVT through a deep pool of water on a rainy day and later discovered that when I put the shift lever in reverse or drive it jerks heavily. Scan results show codes: U0101, p1740.
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Tuesday, June 23rd, 2020 AT 9:37 AM

14 Replies

Tiny
STEVE W.
  • EXPERT
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.
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Tuesday, June 23rd, 2020 AT 10:20 AM
Tiny
JADDUN
  • MEMBER
Cleaned out the connector, which was dry, then start the engine then noticed d shift indicator (p) didn't display on the dashboard as it should until after about 6 minutes warm up but still the same problem.
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Tuesday, June 23rd, 2020 AT 11:40 AM
Tiny
STEVE W.
  • EXPERT
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.
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Tuesday, June 23rd, 2020 AT 12:04 PM
Tiny
JADDUN
  • MEMBER
Thanks, but what if water got into the panel of the TCM and has affected it, or water can't affect it?
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Wednesday, June 24th, 2020 AT 12:30 AM
Tiny
STEVE W.
  • EXPERT
It could have depending on how well sealed the module is, however it's not as likely as they are normally very well sealed.
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Wednesday, June 24th, 2020 AT 5:12 AM
Tiny
JADDUN
  • MEMBER
Yes but mine has a hole somewhere at the middle of the front side (the TCM). I don't know why they put a hole there.
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Wednesday, June 24th, 2020 AT 5:18 AM
Tiny
JADDUN
  • MEMBER
The black covering is missing in mine (from the attached pic).
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Wednesday, June 24th, 2020 AT 5:22 AM
Tiny
STEVE W.
  • EXPERT
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.
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Wednesday, June 24th, 2020 AT 10:53 AM
Tiny
JADDUN
  • MEMBER
Please how does one test it?
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Wednesday, June 24th, 2020 AT 11:02 AM
Tiny
STEVE W.
  • EXPERT
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.
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Wednesday, June 24th, 2020 AT 1:24 PM
Tiny
JADDUN
  • MEMBER
Thanks, is the TCM plug and play? Or one will have to do some copy and paste to a new one?
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Wednesday, June 24th, 2020 AT 9:41 PM
Tiny
STEVE W.
  • EXPERT
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.
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Thursday, June 25th, 2020 AT 9:33 AM
Tiny
JADDUN
  • MEMBER
Good day, please my car won't start and after opening the engine I discovered the injectors are not spraying, please what could be wrong?
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Tuesday, August 11th, 2020 AT 2:15 AM
Tiny
RENEE L
  • ADMIN
Hello JADDUN,

My name is Renee and I am the site's editor. I noticed in your question you are asking about two different and unrelated issues with your vehicle. Can you please start a new question regarding the not starting issue? The reason being; in order for the site to properly index the questions they need to about one issue/vehicle otherwise people will not be able to find the answer to this question under a different subject. The premise of our site is to assist those that need direct help and also provide a resource for others that have the same issue.

For your convenience here is the link:

https://www.2carpros.com/questions/new

Make sure you are logged into the site before clicking on the link

Thank you and have a great rest of your day!

Renee
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Tuesday, August 11th, 2020 AT 3:12 PM

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