09-14-2022, 08:23 AM | #1 |
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XHP Reflash after transmission service?
Hi everyone,
I did some searching on here and Google and couldn't find the specific scenario I'm looking for info on. I had a shop do a trans service on my car, changing out fluid and doing the pan/filter replacement. My car has been flashed to XHP stage 3 for the past 1000 miles or so. Question: do I need to do any unflashing or reflashing with XHP with this service being performed or just leave it? Thank you- JM
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09-14-2022, 10:02 AM | #2 | |
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Pretty sure you do not need to unflash or reflash xhp by only changing out the oil and filter. It doesnt change much more than making it smoother
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09-14-2022, 10:12 AM | #3 |
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That's what I was thinking. The shifts do feel smoother but I have heard the whining noise a couple few/times randomly accelerating in a couple different gears. That did not happen before the service. Sounds like that is a normal thing for the 8 speed auto trans.
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09-14-2022, 10:27 AM | #4 | |
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09-14-2022, 11:05 AM | #5 | |
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09-15-2022, 08:08 AM | #7 | |
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I read somewhere in the past, the adaptations is supposed to adapt to your wear and tear in the systems. If you reset it by just doing filter/fluid, wouldnt that messed everything up? At the same time, the adaptations adapt to the old filter/fluid which is probably rougher. So when that changes, wouldnt that needs to be reset? |
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09-15-2022, 08:16 AM | #8 | |
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10-04-2022, 12:43 PM | #9 |
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Anyone have a link to a step-by-step DIY guide for changing the ZF8 ATF & pan/filter?
Had a one-man shop do it for me the first time around at 42k miles and it didn't take long. Figure I'd give it a try while I'm under there to change the oil. |
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10-24-2022, 12:11 PM | #10 |
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You are NOT supposed to reset trans adaptions after a service. Only do that if you have a trans rebuilt or replaced with a new one. Thats very very bad..
If you have issues after a service its likely an issue where the trans isn't at fluid capacity.
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10-24-2022, 08:03 PM | #11 |
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Timely thread.
I also had my trans serviced recently at ~50K mi. at a local BMW dealer. And, I also think I heard a whine under acceleration that I didn't hear before. You'd think they would have topped it off properly, but maybe I should bring it back to have them check, just to be sure. Edit: I did not re-flash xHP or reset adaptations.
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10-25-2022, 09:12 AM | #12 |
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Oh and you do not need to reflash anything after a servuce.service.. at all.. thats silly
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10-25-2022, 03:10 PM | #13 | |
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I haven't heard the whine in a couple weeks and no drivability issues for me.
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