Two problems related to power train have been reported for the 2012 BMW 135. The most recently reported issues are listed below.
Vehicle exhibits an intermittent hesitation (like a stall) where there is an apparent total loss of power at low speeds (coasting) or from stopped. On several instances this has happened while in a left turn lane with oncoming traffic and creates a serious safety hazard. The vehicle more frequently, but not always surges in rmp without throttle input when coming to a stop. In many instances, the vehicle lurches forward and extra braking is required. This has resulted in near miss, rear end, assured clear distance issues. These two problems occur during city/residential driving including at slow speeds through school zones (a major concern). I purchased this car used, but with low mileage and encountered these issues on the day of delivery. Dealer reprogrammed an engine control module according to a BMW safety bulletin which I found online. The drive home was noticeably improved, however the conditions returned shortly there after and persist to this day.
When driving in traffic the BMW 135i dct transmission will stall when coming to a stop. This results in a loss of power steering. Sometimes before the car stalls, the engine will rev without driver input to 2500 rpm and drop the clutch which results in a rapid acceleration if your foot is not on the brake this can be extremely dangerous. I have almost crashed the car many times as a result of this. BMW issued a technical service bulletin to dealers that can be found if you google the issue, but there is no known remedy. The car has been in and out of the dealer close to 10 times and they claim there is no issue. I believe the issue to be with software of the engine and transmission.
| Vehicle Shudder problems | |
| Power Train problems | |
| Transmission Failure problems |