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Tim's Auto Repair
Tim's Auto Repair, Mechanic
Category: Transmissions
Satisfied Customers: 15824
Experience:  I have been rebuilding automatic transmissions for 25 years
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I got the code 4f85 the transmission was rebuild and the

Customer Question

I got the code 4f85 the transmission was rebuild and the problem was not solve
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: Code 4F85 the sintoms are when the car is under aceleration and shift from 4th to 5th gear the gear slips and the engine revs up and goes to fail mode also when driving slowly sudenly the transmission goes to fail mode
JA: What is the model/year of your BMW?
Customer: 2005 525
JA: Are you fixing your 525 yourself? What have you tried so far?
Customer: no at the transmission shop
JA: Anything else you want the mechanic to know before I connect you?
Customer: the transmission was rebuild using a good quality repair kit and the problem remains the same what do you think that it may be the problem We tested the TCM and is OK
Submitted: 6 months ago.
Category: Transmissions
Expert:  Tim's Auto Repair replied 6 months ago.

Hi, My name is ***** ***** for the delay.
I will do my best to assist you.

Expert:  Tim's Auto Repair replied 6 months ago.

i would still think the problem is internal..it is still loosing fluid pressure to overdrive

Expert:  Tim's Auto Repair replied 6 months ago.

i would think it will need to come back out and apart

Customer: replied 6 months ago.
Can you tell me what it needs to be replaced or checked?
I sow in the web some body who says the error code 4F85 is that 4F85 is. The bushing for the input shaft wears out of spec and then you start getting that code. do you think this is right?
Expert:  Tim's Auto Repair replied 6 months ago.

yes,,that is possible,,you need to take it apart and check all the seals,sealing rings and air check the hubs and servos

Customer: replied 6 months ago.
All the seals and discs were already replaced
your answer is very uncertain I need a more precise diagnostic of this problem
Expert:  Tim's Auto Repair replied 6 months ago.

cant really get more precise..there is a;llot ove places to have a pressure leak..all you can do is more inspecting and testing

Customer: replied 6 months ago.
you think that is a problem of pressure leak, any chance that it may be the valve body?
Expert:  Tim's Auto Repair replied 6 months ago.

yes,,there is always a chance for it to be the valve body..

do you get any P codes?

Customer: replied 6 months ago.
no
Expert:  Tim's Auto Repair replied 6 months ago.

ok,,this again makes be think the problem is internal and mechainical of the transmission..

all you can do is start from scratch and inspect and test everthing as you put it together

Expert:  Tim's Auto Repair replied 6 months ago.

i would think the re builder missed something the first time

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