krish
Club Guest
- Joined
- Apr 24, 2006
- Messages
- 39
- Points
- 8
Hi Guys,
My E63 645Ci developed shift problems after a recent service. I got the usual 'new oil, old transmission...blah blah blah from the shop.....' Didn't make any sense logically, and my conclusion was that something wasn't done quite right. So I did some research via google and came up with.....
You'll need Inpa or some other diagnostic software to do the following. Inpa is available online, you'll need to get the cable to access the system ECUs in the car. All of this info and cable is available online.
First thing I did was check the transmission fluid level. This has to be done with the engine running and the fluid at between 30 - 35 deg C. Mine was overfilled by about a liter :s: . Drained the excess fluid off. This might have caused the shift problems I had noted but....you have to erase any error codes stored in the transmission ecu and reset the adaptation values. The latter is the key here. The stored error codes could have caused some issues, I erased them just to be sure. The adaptation values though are what the transmission 'learns' from your driving style as well as the aging of the gearbox components and fluid. If you fill in fresh fluid, the transmission will try to run with the old fluids values (whatever those were :65: ). By resetting the adaptation values, the transmission starts with a clean slate and relearns the new characteristics of the fluid and gearbox condition.
After this, took my 6er for a drive and she was immediately better. Over the course of a week of driving and 'relearning' she has settled down and is back to creamy smooth shifts. Unlike the bucking bronco she had become after the intial 'service'.
Trust this helps some of you out there. I have heard of too many stories where after a simple oil and filter change in a transmission problems arose that ultimately led to a replacement gearbox.....
cheers,
Kris
My E63 645Ci developed shift problems after a recent service. I got the usual 'new oil, old transmission...blah blah blah from the shop.....' Didn't make any sense logically, and my conclusion was that something wasn't done quite right. So I did some research via google and came up with.....
You'll need Inpa or some other diagnostic software to do the following. Inpa is available online, you'll need to get the cable to access the system ECUs in the car. All of this info and cable is available online.
First thing I did was check the transmission fluid level. This has to be done with the engine running and the fluid at between 30 - 35 deg C. Mine was overfilled by about a liter :s: . Drained the excess fluid off. This might have caused the shift problems I had noted but....you have to erase any error codes stored in the transmission ecu and reset the adaptation values. The latter is the key here. The stored error codes could have caused some issues, I erased them just to be sure. The adaptation values though are what the transmission 'learns' from your driving style as well as the aging of the gearbox components and fluid. If you fill in fresh fluid, the transmission will try to run with the old fluids values (whatever those were :65: ). By resetting the adaptation values, the transmission starts with a clean slate and relearns the new characteristics of the fluid and gearbox condition.
After this, took my 6er for a drive and she was immediately better. Over the course of a week of driving and 'relearning' she has settled down and is back to creamy smooth shifts. Unlike the bucking bronco she had become after the intial 'service'.
Trust this helps some of you out there. I have heard of too many stories where after a simple oil and filter change in a transmission problems arose that ultimately led to a replacement gearbox.....
cheers,
Kris
