N54 cranks but no start

DavidDeLeon335i

New Member
Jun 29, 2021
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So I just swapped a new N54 into my 335i and also a ST Kit from on3 . Took the car to a car meet it ran fine and after we went on a small cruise. When I got home the car won’t start now it just cranks. Just seems strange it was running good before and I recently put a new battery in and coded it too, any help anyone?
72D498C0-EB97-41A0-96AA-A33E9281E5E5.jpeg
here are the codes I scanned off the car
 

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DavidDeLeon335i

New Member
Jun 29, 2021
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Just wanted to update the thread incase someone had similar symptoms. The fix was a loose ground. It was the ground strap that goes from the dme to the chassis. I tightened it up and now the cars showed the gear it was it (which it wasn’t doing before) and then started up right away.
 

fmorelli

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Aug 11, 2017
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E89 Z4 35i, F10 535d
Makes sense because that kind of code set would have had me checking for a weak battery. Poor ground would present similarly. Whew you are lucky you didn't chase this for weeks on end!