Transmission slipping between 35 MPH and 45 MPH?

JR PAYNE

MEMBER
2011 FORD FOCUS
2.0L
4 CYL
2WD
AUTOMATIC
115,000 MILES

When I take off from a complete stop no problem on shifting it goes right through the gear and then once he gets to 30 between 35 and 45 miles an hour and it's getting ready to shift to the next year it like free wheels like it just went into neutral. If I put it back down to low and then back up the drive, I can get it up to about 55 miles an hour and it'll stay there but it's winding out a lot higher than normal RPMs would be at that point. Can anybody help on this weird shifting problem?

6 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,602 POSTS

It sounds like the input shaft sensor is going out. Can I ask if you have a check engine light on? We should run the codes to see if any are stored.

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

I would also check the transmission fluid level and if you have not changed it, we should service the unit.

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

Here is how to check the fluid out in the transmission in your car and I have included the input shaft sensor location so you can check it out.

Fluid Types
Automatic Transmission Fluid

Ford Part Name

- Motorcraft MERCON LV ATF

Ford Part Number

- XT-10-QLV

Ford Specification

- MERCON LV

NOTE: Automatic transmissions that require MERCON LV should only use MERCON LV fluid. Use of any fluid other than the recommended fluid may cause transmission damage.

Check out the images (below). Please upload pictures or videos in your response to the problem so we can see what's going on.

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Monday, February 5th, 2024 AT 5:17 PM

JR PAYNE

MEMBER
46 POSTS

Thanks again for the quick reply, I appreciate that. Yeah, I did take a look at the transmission fluid it looks great nice and pink it's fresh doesn't smell burnt whatsoever and I also ran a scan and the on the car and this is what I came up with on the scan. I'll see if I'll send it to you and see if you can decipher what you think. Also, is there a way to test that TSS on that car?

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Monday, February 5th, 2024 AT 5:51 PM

KEN L

MASTER CERTIFIED MECHANIC
47,602 POSTS

All of these codes need to be fixed, the top code for the alternator please start a new thread for. The last two we need to fix for the transmission problem. Let's change out the TPS sensor and the transmission range sensor and then clear the codes to see if that fixes it. Here is how the job is done. Check out the images (below). Let us know how it goes.

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