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Had some welding done on my trailer hitch. We disconnected the 12v and High Voltage. After reconnecting the HV and 12V the car won't go into gear. The yellow error code top right is on. Does anyone know how to reset this? Have tried multiple times to disconnect and reconnect the battery. Turned off and on 5 times in a row. What else. Thank you.
 

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If it’s still under warranty you might want to call Fiat roadside and get it covered at the local dealer. I wouldn’t volunteer about disconnecting anything and just talk about not moving and the error.
 

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I know this is a dead thread, but I wanted to share an answer to this problem in case anyone else has this issue. In this state, the car is basically bricked.
  • Make sure you follow the "12 Volt Power Down/Up" procedure found on Tech Authority. Definitely read it several times in full, but the gist is:
    • Power down - OFF, wait 5 minutes. HV disconnect. 12v disconnect.
    • Power up - (Should already be OFF). HV connect. 12v connect.
  • HV disconnect is very fiddly and will not properly seat unless it's removed/inserted with the handle at 90° (there is a second latch holding it at 45°) - I presume this was the root cause of both our problems. It looks like it's in, but it's probably not.
  • Clear any related faults, pray to baby Yoda, hopefully drive your car again.
TIL, never touch the disconnect again.
 

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Interesting that there are two contradictory sequences.

Disclaimer, I did not find this in a manual or any source, but logically, it seems that when powering down that this would be the sequence:

Make sure no charge cord is plugged in.
Remove key from ignition.
Pull hood release latch.
Shut driver's door.
Open the hood.
Make sure the clunk/clunk of the HV relays has happened so the HV pack is not active.
Undo the negative leads of the 12V battery.
Undo the positive leads of the 12V battery (for extra safety).
Pull the HV disconnect under the rear seat wearing personal protective gear (HV insulating gloves, etc.) while doing do.

And the power up sequence would be the reverse of the above.
 
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