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Strange speedometer problem


Joe Hogan

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Hey everyone, new to the forum and wanted to see if I could get a little help. I don’t have access to diagrams and logic flow charts for the car, so I’m shooting in the dark. 
 

I have a 2014 MKZ 2.0 Ecoboost. 
 

when I get in the car and start it up, for the first few moments I drive, the digital speedo needle bounces (like missing teeth on an old school speedo cable). 
 

Once I hit 20 mph, or drive enough time where the doors auto lock, the speedo stops bouncing and all is fine, however, o then lose stabilitrak, abs, and traction control. Also, my steering seems to default to sport feedback. My drive modes in the menu also are greyed out, not allowing me to select the handling or performance in D or S modes. 
 

Does anyone know the logic flow for a faulty speed sensor? Will the computer default to an ABS sensor in the case the speed sensor is bad?

 

The car does not throw any codes on a standard obd2 scanner, and I have not taken it to Ford yet. 
 

Thanks in advance!

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