panel lights steady on break, esc, abs, tpms and engine. what is wrong?

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affected vehicle systems including , transmission shift when down shifting, electronic stability control, odometer, speedometer and the cruise control not working, rpm unstable. engine shuts down often when coming to a stop. .brake fluid motor runs loudly on and off when breaking. computer diagnostic just indicate no communication with brake. Hyundai mechanic cannot define problem! he says it COULD be wheel sensor. no diagnostic codes! what to do?