I own a 2008 Audi A8 with about 48200 miles. It is great vehicle but having problems with transmission during driving. Under load it will go in fail safe mode around 4,5,6 gears. It is causing dangerous situations as car starts stopping suddenly and causing driver momentarily loose control of a vehicle. This iissue was brought up to a Audi but they said it is past warranty. By doing an independent research, it was found that there is one single teflon seal controlling fluid pressure for a clutch E.that seal wears out prematurely causing fluid to loose pressure and failing safe transmission. In order to repair this issue seal needs to be replaced with aftermarket one. Information about it was obtained from zf transmission service bulletin and is available online. Zf manufacturing knows about this and rebuilding this transmission. When fluid pressure is lost it causing transmission fail safe in order to prevent completely being damaged. All fail said occurs when vehicles show being driven. Please investigate this problem because it creates a safety hazard. The attached pictures are screenshots from scanning transmission errors. Also, there is a copy of zf technical bulletin manual describing cause of a clutch E.it seems to be designing flow with this transmission. Thank you

- Hoffman Estates, IL, USA

Automatic transmission going into fail safe mode during driving around 4,5,6 gears when going around 70+ mph and release gas pedal and applying gas again in order to pass vehicle. Car goes into fail safe mode, needs to be pulled over to restart and reset transmission. Car was taken to a Audi dealer for an inspection and by technician at fluid level was low. Top up trans fluid. Was driving ok for two weeks, problem started again. Took car back to a dealer, technician called an Audi support center. By Audi support center was recommended to replace atf filter with optimized atf filter. Reason for replacement was seal on a top of atf strainer that was shrinking by temperature of fluid ( per zf transmission manufacturers.) because of design change, atf strainer can come loose from the guide of atf pump intake duct. As a result, air can be drawn in. Air causes the oil to foam, which prevents the clutches from closing completely and cause fail safe mode to transmission. This is an information I have obtained from both dealer and zf transmission engineering. Owners of Audi models 2010 A4, 2008-2010 A6, 2008-2010 A8,2010 Q5 may have complained about this problem as well. As a remedy, optimized atf strainer was developed. There are some vehicles that have same safety problem as mine. This is a big safety concern because vehicle can not be driven on expressway because of transmission fail safe mostly during passing another vehicles or changing lanes. When transmission fail safe it is only driven in 4 gear and will not shift. Vehicle has to slowed down and stopped for resetting transmission by shutting car off and restarting it again. This created hazardous situation for myself few times and a big safety concern. I did inform Audi corporation about this issues and they stated that nothing can be done on their side to help me because car is out of warranty. Car with 42000 M

- Hoffman Estates, IL, USA