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Message: <blockquote data-quote="jarance" data-source="post: 385084" data-attributes="member: 21">Did the guy used the right ATF.. It is very likely that the wrong spec is used. BTW, did you have any problem with the GB prior to changing the ATF.BTW, why did you change the ATF?Your hydraulic pump for the GB is either faulty or the ATF oil level is low will cause the "oil pressure low" alarm. I would think that the cause is due to wrong specification of the ATF. "Pressure Actuator 04" alarm is only the solenoid. You dont need to do a GB overhaul.. To replace only required to drain the ATF, remove the oil sump pan, remove the filter and then gain access to the solenoid. Get a second opinion from BMW specialist.</blockquote>