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Hi everyone. I have a 2015 Fiat 500c lounge. 64k miles on it. Has been running great until 3 days ago. Car stalled out of nowhere and i ended up with these two codes: Ignition coil P0354, and Unknown issue U1404. Had a mechanic check it out and hes telling me to get rid of the car or get ready for a 2k tranny replacement. Ive been reading as much as possible to see why this may be and i cant get a great. answer. I appreciate anyone with knowledge on this unknown code. Thank you!!

Leslie
 

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U1404 could usually come up whenever there's abnormal signal discrepancy is detected by the PCM, and usually accompanied by other code, in this case P0354. It doesn't necessarily have to do with a transmission, so I have no idea how your mechanic reached that conclusion. I'd first take care of P0354, then go from there.
 
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