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

JOSHUAWLSH0

MEMBER
2008 FORD EXPEDITION
V8
4WD
AUTOMATIC
140,000 MILES

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.

Wednesday, August 2nd, 2023 AT 9:11 PM

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,690 POSTS

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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Thursday, August 3rd, 2023 AT 12:13 PM

JOSHUAWLSH0

MEMBER
2 POSTS

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.

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Thursday, August 3rd, 2023 AT 12:24 PM

KEN L

MASTER CERTIFIED MECHANIC
47,690 POSTS

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.

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Friday, August 4th, 2023 AT 10:15 AM

KEN L