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My 2016 Fiat Freemont stays in second gear when driving. When you disconnect the battery and reconnect it, all the gears work for a while and it goes back to staying in second.
If this was a problem with the actual transmission, you’d find the problem would probably not come and go. But since it’s dependent on the battery being disconnected and then reconnected, the smart money says it’s a problem with either a sensor that sends information to the driveline computer, or the computer itself.
You could start by scanning the vehicle to see if a dud sensor reveals itself. But you may also find that a replacement ECU (computer) is the ultimate fix.
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