slacken handbrake cable by at least three turns. forcibly press the brake peddle loads of times clicking stops. retighten the cable. make sure the rear wheel rotate freely. check the handbrake action starts before the First notch. make sure the handbrake doesn't past the fifth notch. Its easy. There is too much false information floating around
A few days ago I had the exact some problem (fault code P1818), gearbox going into N on the highway in automatic modus etc. The Fiat-dealer quoted me 1300 EUR for replacement of basically the whole big gearbox component in evg's picture and after I found this thread, I took the car to an independent Fiat-specialist who confirmed evg's story
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