Pendulum shifting can be caused by several factors, software, poor TCC lockup and/or a bad torque converter, intermittent or plausibility issues within the speed sensors inside the transmission. The transmission should be interrogated with the BMW software at the dealer level and then perhaps a path of repair could be determined. If I had to guess, I would say Torque converter, it sounds like it is shifting into torque converter clutch lockup and the clutch is failing to lock up and replacement of the converter may be in order. Typically a repair facility will charge a diagnostic fee for this information.
Tuesday, August 25th, 2009 AT 8:56 AM