2014 BMW 335I XdriveRecalls, problems, MPG & safety

“After the car is shut off, the coolant pump will stop with the car but after a min the car will stay off but the coolant pump will kick on. Runs until battery is drained. I do understand there is a feature to circulate the coolant so help mitigate burn/hot spots but this continues until the battery is disconnected by ECU. Then it won't start because the battery is too low. Ongoing issue for the past 2 years now, happens intermittently. Frequency is random but happens more when it's cold out. But average happens a few times a week when cold out, sometimes it runs well for a few weeks then starts happening again. We had tried to troubleshoot by BMW but no luck. They have replaced battery, alternator, have tried to diagnose about 4 times now but they haven't fixed it since they can't replicate at the BMW Shop. I can hear the coolant pump running as well as feel the water moving. Also tested by Fluke Meter, it drains at about 40 amps (at 12 volts) when this happens, with the car off. Doing anything (opening doors, trunks, locking, unlocking, stops it for a minute but then pump starts again). No errors pop up for it except when the battery is low and then error…”

“EVERY TIME I GO FROM I93 MASS TO I90 HWY ON THE EXIT MY CAR SHUTS OFF FOR 3SEC AND RESTARTS THE ELECTRONICS. NOT SURE WHAT DEFECT OR SENSORS ARE IN THE AREA THAT CAUSES THIS MALFUNCTION. BUT THIS ONLY HAPPENS WHEN I TAKE THE SAME EXACT EXIT EVERY SINGLE TIME.”

“THE SYMPTOM: THE CAR MISSES OR SHUTTERS UNDER LOAD. THE DEALERSHIP INFORMED ME THAT THE CAR NEEDS A NEW TRANSFER CASE. THE VEHICLE HAS 80K MILES. THIS IS A MAJOR DRIVETRAIN FAILURE IN MY OPINION FOR A CAR OF THIS AGE WITH AVERAGE MILES AND CONTINUALLY SERVICED BY THE DEALERSHIP AND DRIVEN BY TWO PEOPLE. TODAY I READ ABOUT A RECALL FOR A 2014 MODEL 328D THAT REQUIRES REPLACE THE CONSTANT-VELOCITY JOINT AND INSPECT THE TRANSFER CASE, REPLACING IT IF NECESSARY. I SUSPECT THE SAME FAULTY PART COULD ALSO BE THE CAUSE OF MY NOW FAULTY TRANSFER CASE.”