BMW 135I 2011–2013 — technical service bulletin
Bulletin 121514 · NHTSA communication 10148217 · issued Aug 1, 2014
Technical service bulletin
communication type
Engine
component
2011–2013
model years
4
vehicle entries
Official summary
N55 with Double-Clutch Transmission: Idle Fluctuates when Stopped. A customer may complain that after coming to a stop, the engine speed intermittently fluctuates from about 500 RPM to 1,100 RPM. This situation can be more noticeable when the air conditioner is on. Unfavorable DME software.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.