Problem with my Speedometer and Transmission after ECM replacement

2001 FORD F-150
52,400 MILES
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PDB_621
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  • 1 POST
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.
Oct 4, 2011 at 8:13 PM
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PROAUTOTECH
  • ✓ASE Certified Mechanic
  • 288 POSTS
  • ASE Certified Mechanic
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.
Oct 4, 2011 at 8:16 PM
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