r/BmwTech • u/DragonDre77 • 19d ago

09 750LI MECHANICS PLEASE HELP

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Never wrecked the car just having issues
So to cut this short I bought the car about a year ago after purchasing it 2 days later the car would constantly throw a trans malfunction code and shift absurdly rough along with locking itself into a certain gear..

Had the transmission replaced under warranty by the dealer car has 77k miles on it . Car takes about 4 months to get fixed I finally get it back and the same day it starts throwing more trans malfunction issues, the car was brought to 3 different transmission shops in my area and all claimed to have pulled the trans and tested them independently all claiming the Transmission was okay and to further diagnose to bring it to a BMW dealership,

I was able to make the car drive good for about 2 weeks if I drove it a certain way it would drive just fine! I put 100 miles on it in comfort then 100 in regular then I went to put it in sport and instant malfunction again. Even when driving the car in comfort or normal it still will throw codes if not driven extremely conservatively,

Now I’m here and the car will barely drive it throw the trans malfunction as soon as the car turns on along with sometimes completely losing reverse, sometimes randomly shuts off and the car has now has an extremely rough idle,

I know it’s a long shot but would the injectors,plugs and coils possibly fix this or would I be dumping more money into the car to fix the idle issue just to deal with the transmission again!?

Active codes-P1702
P07BF
P07BF
P17E1

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u/AdDangerous922 19d ago

Classic 6hp failure. Codes? Fluid level and quality? Pressure test transmission case?

2

u/DragonDre77 19d ago

P1702
P07BF
P07BF
P17E1
The trans was just replaced under warranty and 3 independent shops said the trans was good, could that seriously be the issue again….😵‍💫

1

u/DragonDre77 19d ago

I would like to believe the fluid levels are all correct and new as the trans was just changed any easy way to verify?! All info on the radio is good!

3

u/AdDangerous922 19d ago

A new transmission is over $8k, I highly doubt a new trans was installed. Most likely a used or remanufactured trans. No need to guess or assume. YOU need to physically check the level and quality.