Transmission Won't Learn Gear Position

Patrick Technician Nevada Posted   Latest  
Discussion
Driveability
2014 Fiat 500L Trekking 1.4L (H EAM) 6-spd (DA1-C635) — ZFBCFADH2EZ028793
P1D34
Gear Position Wont Learn

We have replaced the clutch and Transmission control unit. When performing the Quick learn it passes the procedure and the vehicle will drive normal and shift fine. But sets the transmission light and check engine light ( P1D34 trans gear position learn not run). Used a factory scanned and wasn't able to get it to reset. 

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John Mechanic
Illinois
John
 

As far as I can tell that code only refers to the TCU. I think you may have gotten a defective TCU. If it were a wiring issue you would have gotten a different code.

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Robert Mobile Technician
Michigan
Robert
 

Did you follow service information where it states to do 5-6 up shifts and 5-6 down shifts before performing the quick learn procedure? How about a global reset and then perform the quick learn? Why was the TCM replaced? Can you re-install the old TCM and do you have the same issue. Process of elimination here to get direction.

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Patrick Technician
Nevada
Patrick
 

I tried the up and down shifts than the quick learn and also have done a global reset also. With the old TCU it wouldn't go into gear at all unless you went from drive to neutral multiple times than it would go into limp mode

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Charles Technician
California
Charles
 

Was it setting that fault before you did the clutch and TCM?

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Patrick Technician
Nevada
Patrick
 

Unfortunately we didn't scan the vehicle before replacing the clutch

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Robert Mobile Technician
Michigan
Robert
 

I would double check powers and grounds and communication and if all this is ok. Reach out to the dealer for a new one. Does the box look like it was open prior?

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