Code PO751, transmission not shifting properly?

Tiny
BLESSING4334
  • MEMBER
  • 2001 GMC YUKON
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 269,400 MILES
Not shifting very good into overdrive. It pulled code po751. What do I need to do to fix this?
Friday, December 2nd, 2022 AT 9:08 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,254 POSTS
Hi,

There are two different transmissions available on this vehicle. Do you know which you have?

4L60-E / 4L65-E Automatic Transmission

4L80-E / 4L85-E Automatic Transmission

Also, is this the only code set? The issue is similar for both transmissions, but there are different basic tests. If you look below, pic 1 is the diagnostics for the 4L60 and pic 2 is for the 4L80.

Let me know if there are other codes. Also, let me know if the fluid is both clean and full.

Take care,

Joe

See pics below.
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Saturday, December 3rd, 2022 AT 11:35 PM

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