Trans Fail Safe HELP X5 2005 4.8is

[sethgoldX5]

hello , I own a 2005 X5 4.8is 81k... Engine valve seals rebuilt and battery replaced in Nov 14... was driving Sunday and went up a fairly steep street , all of a sudden the car switches to Trans Fail Safe mode...I park the car , come back later and it turned on and drove fine.... Took the car for an oil change and explained the Trans Fail safe to the mechanic... when he has the car up on the lift , we noticed some leakage on the Transmission pan... I had them change the transmission pan seal and filter and add 5 liters of that " lifetime " fluid....the car drove fine , then went up another incline and it went into Trans FaiL Safe mode again... Shut car down , called mechanic , drove the car home ( not in Fail safe mode , but the car felt sluggish ) Today I was taking the car to the mechanic in Queens , I live in Manhattan...as i was on the approach to the midtown tunnel , one car away from entering , all the lights in the car start flashing and I cut the ignition... The car wont restart , so I use the Battery booster to jump the car and pull it over to wait for the tow truck... The car gets towed to the mechanic , and he starts the car ... starts fine... checks the alternator and it gives off 14.8 volts... he says that is perfect voltage..

The mechanic is going to check the Battery and run further diagnostics... He wants to check the starter and Alternator by inspection ( start charging me money to find them and inspect the wires ) Other then the recent Trans Fail Safe mode the car runs great... I don't think its the transmission as the car shifts fine... when I was there for the oil change , the mechanic did say it was giving off some codes related to voltage but " nothing to worry about "

I am not really super knowledgeable about cars , but love this forum and it has helped me with other car issues and to become better educated about my X5... ANY help or advice would be great...

THANKS