Will not shift out of park

Tiny
RUMENDOC
  • MEMBER
  • 2006 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 210,000 MILES
I changed the brake booster and now it will not shift out of park. I have checked the fuse for the brake switch, it is good. No brake lights, put a brake switch in. No difference.
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Saturday, April 7th, 2018 AT 1:07 PM

5 Replies

Tiny
KEN L
  • ADMIN
Hello,

It looks like there is a shift interlock controller up by the brake pedal. can you see if it got disconnected or the connector bumped a little?

Here is the wiring diagrams that shows the interlock fuses that run the system as well:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Below are diagrams on the shift interlock as you can see how it works and the fuse locations.

Check out the diagrams (below).

Please let us know what you find.

Cheers, Ken
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Monday, April 9th, 2018 AT 12:18 PM
Tiny
RUMENDOC
  • MEMBER
I took my vehicle to my mechanic today. After doing some test, he found that the brake light switch works if he moves the switch manually against the connecting rod of the booster. They checked to make sure that the brake booster that I put on a couple of days ago was the correct one. According to the part store that I purchased the booster from there is only one booster for that year and model, but my mechanic found two. They are thinking that the nipple on the end of the shaft on the new brake booster is too narrow to trigger the switch. I hope they are correct. They are getting both of the boosters in tomorrow to see if there is a difference. One booster is for electronic stabilization and one not. The VIN number really did not tell us either way.

Hopefully I will be able to give you an good update tomorrow.
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Monday, April 9th, 2018 AT 7:45 PM
Tiny
KEN L
  • ADMIN
That should do it because if the brake light switch is not being activated it will cause the problem.
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Tuesday, April 10th, 2018 AT 10:26 AM
Tiny
RUMENDOC
  • MEMBER
I picked up my vehicle from the mechanic and the brake booster that I put in was defective. They put in a new booster same model and everything works.
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Tuesday, April 10th, 2018 AT 4:11 PM
Tiny
KEN L
  • ADMIN
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Tuesday, April 10th, 2018 AT 5:45 PM

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