Transmission not shifting properly, vehicle stops accelerating and engine just revs?

2008 FORD EXPEDITION
140,000 MILES • V8 • 4WD • AUTOMATIC
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JOSHUAWLSH0
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Vehicle stops accelerating and just revs. I can use second gear to get it moving, but every time I put it in drive it doesn't shift into gear unless I step heavy on the pedal, and then it drops back out and revs.
Aug 2, 2023 at 9:11 PM
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STRAILER
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It sounds like the transmission is low on fluid.

Here is a guide to help you check the level:

https://www.2carpros.com/articles/how-to-check-and-add-transmission-fluid

If the fluid level is okay, I would run the codes because it sounds like the input shaft sensor needs to be replaced. To be sure let's run the codes to see what comes up.

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

Can I ask if the speedometer is working? If not, I would replace the VSS sensor. Check out the images (below). Please let us know what happens.


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Aug 3, 2023 at 12:13 PM
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JOSHUAWLSH0
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The speedometer still works. I am still able to shift into reverse, and from 2 to 1 and back again. The emergency brake light started coming on and off sporadically (while driving. E-brake is not engaged) at the same time the issue started. I don't know if that's a separate issue, or a side effect of what happening with the transmission.
Aug 3, 2023 at 12:24 PM
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STRAILER
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That could be did any codes come up. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Please go over these guides and get back to us.
Aug 4, 2023 at 10:15 AM
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STRAILER
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anything?
May 6, 2024 at 12:01 PM