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.
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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