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Old 12-04-2021, 09:12 PM
mejim707 mejim707 is offline
Join Date: Jan 2018
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Originally Posted by crystalworks View Post
The additive could "fix" the trans, or it could grenade it. No way to tell before doing it. It shouldn't... but we all know how that goes.

No codes at all eh in the EGS? If you are sure the trans is the source, and you are comfortable doing the work, and you really want to keep this X5, then I'd follow:

Step 1: Replace tube seals, bridge seal, mechatronic sleeve, trans pan/filter, and fill with Valvoline Maxlife multivehicle. Clear adaptations.

Step 2: If the above doesn't help. Or it hurts and makes it worse. I'd have the valve body rebuilt w/ Sonnax zip kit. ~$750 service, or $300 in parts if you do it. I paid WorldWideSpecialties to do it for me. Clear adaptations.

Step 3: If above fails. Source low-mileage transmission w/ torque converter. Found mine for $800 shipped with 88k on the clock. Confirmed by getting VIN of vehicle it came out of and running it. Install your rebuilt valve body into it with original EGS (so no coding involved). New seals, pan, etc and clear adaptations.

Those are the steps I went through with our 35d and it shifts/drives like new. All in with PM parts (motor mounts, trans mount, vacuum lines, DPF cleaning, rear main seal, etc) I think it was ~$2000. We have 168000 on the truck. Remember, logically your truck is only worth $4000 at that mileage and with that issue. With a totally crapped trans... worth even less. So make sure to factor that into the value proposition. Ours is pretty nicely equipped and I couldn't send it to the scrap yard. But holy crap did it cost me time and back aches.

Note: Anytime you clear the trans adaptations it will drive like absolute dookie for 10-20 miles while it figures things out again. Mine bucked and even failsafed once. Just restart and keep driving. After a few miles it will get smoother and smoother.
I have a little update. Yesterday on a trip out to get some much required pizza I noticed the car was shifting and driving much smother. It wasn't perfect, I'd say it was about 80%. But that's a step up form like 50% prior.

Today I took it for a long country drive under pretty much all driving conditions. The shudder only happened a few times on the entire trip and the trip was extensive with stop and go, hills, traffic, smooth country roads, dirt country roads and highways. I wanted to cover everything.

I'd say the car felt like 95% - 100%. I had reset the transmission adaptations a few drive cycles back so this maybe the adaptations are getting sorted out? Regardless, it is improving a lot.

I pulled the codes when I got back and I noticed a few new interesting ones.

2CFB and 5F78. Both have not occurred in the last number of driving cycles and both only happened once since resetting all transmission and engine adaptations and codes. You can see the faults and frequencies in the images attached. The one about the DSC I think was due to recently changing out my tire pressure monitors on all 4 wheels with new ones. The others were not working. I'll monitor and see if the DCS code comes back.

The other code about the throttle position adaptations struck my interest since I've seen others speak about that module failing in the pedal and causing a shudder issue. I'll keep monitoring that as well and report back with finding if it comes back.

One other concern is the engine temp. I grabbed a few screenshots form IMPA and the engine temp is in the green but near max after that long drive. Thoughts on this?

I'm also including a few others for the "Mechanical adjustment range VVT ​​from learning routine" and the DME Voltage. The battery was changed many years ago and at the time I didn't know about registering the battery so it was never done. Pep Boys sold the battery to me and didn't say anything about this while they helped change it in their parking lot. So I'm wondering if perhaps it's too close to overcharging?

Any thoughts on these things would be awesome! Thank you!

Throttle Adaptation Error 2CFB

Can't Read DSC Error 5F78

Injector Smooth Running Operation Values - LOOKS GOOD!

Motor Temp - Looks Sketchy!

DME Voltage - Looks Skethcy!

Valvetronic VVT Value - I Have No Clue...
Attached Images

2008 X5 3.0si
256k Strong
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