Transmission not shifting properly

Tiny
DANK1986
  • MEMBER
  • 2011 FORD MUSTANG
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 124,000 MILES
I recently took the car on a drive and noticed after driving for thirty minutes the car lost power and when I hit the accelerator half throttle the car downshifted and rpm's went up but car didn't upshift. I pulled over and turns the car off for a second and then continued home and the car acted fine. The issue went away now I'm trying to diagnose the problem. I could not replicate the issue driving home which is making it difficult. I was thinking TPS issue? Thoughts?
Thursday, May 2nd, 2019 AT 11:26 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi Dank,

It is possible, but I would think unlikely that the throttle position sensor caused the vehicle not to shift properly. As you will see with the attached explanation of the throttle position sensor and ETBTPS. Basically, there are two sensors that send exact opposite signals of each other as far as the PCM is concerned so that even if one fails the PCM will relay on the other. It is HIGHLY unlikely that they both fail causing an issue.

Based on what you described, what I think is more likely is one of your shift solenoids became stuck and did not allow the shift. Basically, the TCM was asking for a different gear and the transmission didn't respond.

If it only happened one time, I doubt there are any codes in the system but it wouldn't hurt looking if you can.

It is not completely uncommon for this to happen. What I would recommend is if you have not changed your trans fluid in a while that you go ahead and do that. Then look for any metal when you take the old fluid out. Once this is complete, just see if it happens again. If it does then try to take note what gear you were in and which you would be shifting to. This will help us narrow down which solenoid it was if in fact that is what it is.

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

Please let me know what you think but unfortunately, unless it happens again and gives us more to go on, there isn't much we can do at this point. Mainly because we would just be guessing.
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Friday, May 3rd, 2019 AT 12:18 PM

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