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Codes P0765 and P0748, transmission will randomly default into third gear

Tiny
JAKEMAN223
  • MEMBER
  • 2007 HYUNDAI ELANTRA
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 139,000 MILES
Transmission will randomly default into third gear and throw a p0765 and a p0748 code. I have already change the shift solenoid pack. And still acting up. Could the TCM/PCM be faulty in this case?
Thursday, May 27th, 2021 AT 3:01 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Yes, it is possible that the module has failed. However, it could also be a solenoid or a wiring issue to the solenoid.

We need to run through the testing below in order to determine this.

https://www.2carpros.com/articles/how-to-check-wiring

I attached the info below for your review. Please let us know if you have questions on this but it appears they require a scan tool to inspect it but it may be worthwhile as getting a PCM/TCM when that is not the issue could be costly.
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Friday, May 28th, 2021 AT 4:05 PM

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