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Transmission will not shift out of first gear

Tiny
F150ECOBOOST
  • MEMBER
  • 2012 FORD F-150
  • 3.5L
  • 6 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 158,000 MILES
Took off this morning and the truck wouldn't shift out of first gear. RPMs went to about 3500. I took my foot of gas and RPMs jumped up a little and came back down slowly, but still would not shift out of first gear. Noticed speedometer not working. After about a minute it started working again and worked fine. It did the same thing after work.

Does this sound like throttle positions sensor, or speed sensor, or something else?
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Monday, June 27th, 2022 AT 4:37 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,973 POSTS
The speedometer and transmission depend on the speed input from the ABS and body control modules. To find out which one is bad let's do a CAN scan which is the future of automotive repair. You can get a CAN scanner from Amazon for about $30.00. here is a video to show you how and a link to a scanner from Amazon. I have included how to change out the BCM, which is what I think is bad.

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

and

https://amzn.to/3OpAotj for the scanner

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

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Tuesday, June 28th, 2022 AT 10:40 AM
Tiny
F150ECOBOOST
  • MEMBER
  • 4 POSTS
It was the transmission speed sensor, or lead frame sensor in this particular transmission. $1,000. Fix.
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Monday, July 11th, 2022 AT 3:44 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,973 POSTS
Yep, good find, sorry it cost so much. Use 2CarPros anytime, we are here to help. Please tell a friend.
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Tuesday, July 12th, 2022 AT 10:52 AM

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