Three problems related to power train have been reported for the 2004 BMW 530. The most recently reported issues are listed below.
Everytime, coming to a complete stop, transmission has a noticeable "bump"/rough shift into 1st gear, took the vehicle to BMW dealership for diagnosis/repair, problem was not solved time and time again. Now, approximately over a year later, transmission warning light on, transmission went into limp mode. BMW dealer states, transmission has to be replaced at my expense due to 3-2-1 downshift. I am the original owner of this vehicle and vehicle since purchase has been maintained meticulously at the same BMW dealership.
I was driving down he highway at a speed of 65 when I tried to accelerate to switch lanes and the transmission faut came on and it also stated to drive moderately. The car also went into a safe mode to were I couldn't accelerate and it wouldn't switch out of third gear. Car then was turned off and back on and code fault went always , two weeks later same thing popped up trying to get on highway and now won't go away.
I have been getting transmission error fault frequently and now seems to happen very often. You can stop the car and restart it and it will run but will generate the error in a month or two again.