Transmission not shifting into overdrive

2005 FORD EXPEDITION
227,000 MILES • 5.4L • V8 • 2WD • AUTOMATIC
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FATLIPS
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Just got the vehicle listed above with a used 5.4 triton 3v. The transmission will not engage in overdrive. anybody know why? it the fix for the slip into neutral when switching into overdrive since it drives without overdrive.
Jan 30, 2021 at 10:03 AM
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STRAILER
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I have seen the pressure regulating pressure solenoid cause this issue. To be sure lets run the codes and if so I have included the instructions on how to replace the unit in the diagrams below.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Jan 31, 2021 at 11:15 AM