Code po751, transmission not shifting properly?

2001 GMC YUKON
269,400 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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BLESSING4334
  • MEMBER
  • 2 POSTS
not shifting very good into overdrive. it pulled code po751. what do i need to do to fix this?
Dec 2, 2022 at 9:08 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
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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Dec 3, 2022 at 11:35 PM
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