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Problem with my Speedometer and Transmission after ECM replacement

Tiny
PDB_621
  • MEMBER
  • 2001 FORD F-150
  • 52,400 MILES
I recently had my ECM replaced (VIN programmed with purchase). After it was replaced I noticed the speedometer is erratic (says i'm going 30mph while actually going 3 or 4mph) and the transmission is not wanting to shift properly. I've done some research and from what I've found it says I need to take it to the dealer and have the program my ECM and speedometer together. Any help with this issue would be greatly appreciated. Thank you.
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Tuesday, October 4th, 2011 AT 8:13 PM

1 Reply

Tiny
PROAUTOTECH
  • MECHANIC
  • 288 POSTS
See if there is a speed sensor, usually on the top of the differential. There should be a plug going to the differential telling your speedo how fast you're going. It may be on the transmission, I'll have to check.
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Tuesday, October 4th, 2011 AT 8:16 PM

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