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my 2015 Ecoboost mustang 6 speed auto just had the engine rebuilt and I got the car back last month. Since I got it back I noticed the car to be a bit sluggish except for when you manually shift it with the paddles. Today, the transmission started to act weird, it didn't want to go past 3500 RPM in 3rd gear nor did it engage 4th gear. I'm not sure if it went into limp mode or if the tranny or engine are damaged.it happened right before I had to be to work so I couldn't test it any further. Didn't see any engine lights or flashing wrenches on the dash display. what could it be? I don't have tools on me, I'm at work right now, so I can't really check the tranny fluid.
 

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Let me see if I'm understanding your issue correctly. You say the engine will not spin over 3500 in 3rd gear? This occurs even if you have the accelerator floored? Once you have the chance check to see if this is also happening in "Normal", "Sport", "Track", and "Wet/Snow" modes. Also try to manually shift it with the paddles and see if that forces it to shift from 3rd or 4th. There may be an issue with your TCM (Transmission Control Module).

U.M.
 
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