ZF8HP45, Code 420012 Diagnosis And Repair

In this video, Had a 2014 BMW 3 Series come to me with a hard code of 420012, would not clear. When this happened the car would not come out of park(we got it out , i explain in video) dropped out the valvebody and found the problem as you will see, installed a new set of solenoids and all is well. Thanks for watching, off to the shop. Please Like video and subscribe to my channel. Gary

[@emoemura8054]

thank you so much for your videos for repairng zf automatic gearbox you help me very much to learn to overhaul them i am from europe you are very master about this zf transmissons thank again sir for your education videos to help people something to learn

[@hdnotlost7314]

Hi Gary,greetings from Australia.Good to see experienced people like yourself at work.

[@GaryFerraro]

Greetings from New York

[@bimmerFreak77]

wonderful video,thanks from Malaysia

[@carlosmahess-sq7cs]

thank you alot. I've learned today. I'm going to do that , my x5 got ta some problems

[@christopheredwards3]

As always very informative. Thank you for the videos please keep them coming!

[@gtisch183]

Hi Gary, follow up to let you know my mechanic replaced all new solenoids with a kit. Original 420012 solenoid short to positive and the code didn’t clear. Still won’t go into drive. The D on the gear shifter flashes. Engine light comes on. Drive Train Malfunction on dash.

[@SergeyAvtocar]

Thank you for the video, I've been looking for a long time good luck to you

[@BiGLyD100]

Great video, explained everything so clearly thank you!

[@DontTellMeMore]

Nice video, thank you, but nothing about the elephant in the room. Most people do not read their owners manual, if they did they would know how to disengage the electronic park from inside the car, no dragging the dead cat or laying under a dead car needed. So when you buy a car first thing first is tune into that famous radio station RTFM also known as Read The eFing Manual. Nice to start with step one before step ten.

[@edersonmecanicadecarro]

Great man, good job. I always watch your videos. Greetings fron Brazil.

[@GaryFerraro]

Thank you

[@oldschool9746]

As always another good video, thank you Gary.

[@miceinoz1181]

Hi Gary, as you have replaced all the solenoids when only one was confirmed faulty, what do you do with the removed serviceable solenoids? Can these be cleaned and tested and used again? What do you do with them?

[@Tony-jv5pr]

Thank you, blessings you help me build my faith. If you sell the kit I'll buy it. Thanks

[@GaryFerraro]

I don't really have one, where are you located?

[@mg1992kamenica]

Code 420052, which solenoid is that?

[@harvrindrsingh]

Hi from dubai. Thanks for great information videos

[@GaryFerraro]

Greetings from New York

[@lilwillsplat0232]

You’re a expert! Truly! My ZF8 jerks downshifting from 3rd to 2nd. Sometimes upshifting to 2nd. The dealership told me my fluid level was low. No leaks apparently. Could the jerking be caused by a bad valve body? Thank you

[@GaryFerraro]

May have lost adaptions,i would reset adaptions before anything else

[@lilwillsplat0232]

@@GaryFerraro I have but the problem is still there. I get a bang and low idle shifts which makes me wonder if it’s the valve body due to loss of pressure.

[@MattJonesYT]

These videos are great but it looks like the lens on the camera has dust on it which gives everything a glowing effect. Maybe cleaning it off with some air would help the picture clarity.

[@GaryFerraro]

ok, will do, Thanks for watching

[@kasundoph.788]

Hello sir.. 4f58..what does it mean?bmw530d..we alrady replace solenoid but the issue is there

[@MrBahengam]

Great job👍

[@carlosmahess-sq7cs]

so how many liters of oil got it?

[@yarieldamian8118]

Hey Gary, so yesterday after resetting transmission adaptation on a zf8hp45 the car started shifting very roughy from 1st to 2nd and 2nd to 1st. I than later got this code 420321 - Gear-ratio monitoring: Gearshift 2 to x not plausible and car won’t shut out of 1st unless I turn the car off and back on.

[@sac1rmh]

Hi Gary, this is really helpful. I am getting a hard jerk on takeoff and stop in a 2011 535i with 160K miles. Since I am second owner, so I plan to do the sealing sleeve, the filter, fluid, solenoids, as well as a few of the gaskets on top mechatronic unit. I have done this on my wife's and daughters e60 535i cars and after resetting adaptation and the relearn procedure, the transmissions drove so smooth - like brand new! However, I noticed that on the 6HPs there is a foam strip above all of the solenoids where the TCU mates with the solenoid electrical connections - I assume this is to keep fluid out of the connections. I could not tell from this video if you would need a similar foam strip for an 8HP transmission. Was it possible embedded into the 8HP TCU so it did not show up on video, or is it just not used on 8HPs? Thank you for these videos!

[@GaryFerraro]

I don't believe it's used, even if you leave it out on the 6HP units, it's ok, won't hurt anything. Check the fluid level in the car first

[@AB-ct8bt]

I have an Iveco Daily van with the 8hp 70 gearbox. When the van is pulling a trailer the gearbox slips when reversing and when also pulling away uphil. Occasionally when cold the shifts are a little jerky. Van is on 120k with previous gearbox service by previous owner at 80k but is worked hard. Is this likely to be fixed through an oil and filter change or any other suggestions please?

[@GaryFerraro]

I would certainly start with this, can't hurt

[@PBuyer]

Thank you very much for all the clips you made. There is an interesting question in bimmerfest forum that can 6hp21 be swappable with 8hp45? Of course it is easily to say no with many logical reasoning. But I think you are in the best position to tell, at least if it is physically swappable?

[@alexxalagoa6760]

Hi I need your help ...my f30 gearbox get water...the gearbox cooler broke so coolent lick into the gearbox...I removed the gearbox clean it up...now I have this fault code 420641: Parking lock defectively engaged...please help me please

[@GaryFerraro]

well, once water gets in there it's trouble, have you tried to clear the code?

[@Vympel777]

Gar, since you guys are servicing zf8 transmissions answer me this, a lot of bmws have a whining noise coming from those modern zf8 transmission boxes. What is causing the whining noise inside these transmissions?

[@ap5062]

hi,what was the millege? is it not good idea to change separator plate and Accumulators? Great job.

[@D730-u8m]

Hi Gary, my bmw g30 have a noticable shift from 1 to 2nd gear? What could be a problem?

[@SOHAIL50280]

Thanks

[@brandonodell4789]

Thanks for the incredibly helpful video, Gary. All of my solenoids tested fine, but I noticed some melted plastic near the TCU chip as well as some discoloration and that "burnt electronics" smell. So I think this is probably the culprit that caused my transmission fuse to keep blowing. My question is where would I be able to find that part? Having a hard time locating one.

[@GaryFerraro]

So you need the whole valvebody/Tcm. Where are you located? what kind of car do you have?

[@brandonodell4789]

@@GaryFerraro Located in Hawaii. 2016 LR4. So even though the plastic housing/mechatronics control unit/TCM disconnects from the valve body, I can't purchase it separately like I can a solenoid kit?

[@GaryFerraro]

@@brandonodell4789 Just to confirm, this is an 8 speed transmission?

[@brandonodell4789]

@@GaryFerraro Correct. ZF 8HP70.

[@GaryFerraro]

@@brandonodell4789 Ok, Not much of a choice but to get a new Valvebody/Tcm. There are companies that repair the 6 speed Tcm's but i do not know anyone yet repairing the 8 speed Tcm's. You scanned the car and got a code, have you tried to clear the code?

[@gtisch183]

N54 engine. 6HP19Z transmission

[@GaryFerraro]

Should have ohmed the solenoids first, so if solenoids did not fix then there is a problem with the tcm, At this point you either have to replace the valvebody/tcm or send your unit for repair. I send mine to Europe for repair, the company is called Softelectronic in Bulgaria

[@johnbaptis9613]

Hello Gary, its a good video.... I have a BMW X3 Diesel Automatic, I have a question, could you please help me to find out which solenoid in a valve body is a 2nd gear solenoid and reverse gear solenoid. Cause, I get a jerk when its kick down in 20-25 speed.

[@GaryFerraro]

are there any codes present?

[@KickTheCANss]

Thank you so much. Could not find much information on this issue. I got the 420042 and it's pretty much the same code but a short with solenoid C. Quoted $6000 from BMW but I will do it myself. Edit: did you have to take out the transfer case bracket in order to release the mechatronic sleeve to get the valve body out or was there enough room for you

[@GaryFerraro]

I don't remember, you may be able to sneak it out or just move it enough to get the valvebody out

[@chrisbullen4317]

Great Video!! Question ; Im working on my ZF6hp26 and I am getting 24.4 ohms on the green MB 2 Park solenoid? does this seem right?

[@GaryFerraro]

Yes. They are usually about 25 ohms

[@keshabroka3318]

Sir vibration car after repair how can find problem

[@GaryFerraro]

is vibration while moving or standing still?

[@waltmartin92]

what do i need to screw up? I'm usually pretty good at this step.

[@Foreignsgarage444]

It’s a bolts that’s sticking out/ down on the driver side of the transmission you can’t miss it you supposed to srew it in but have the e brake on

[@waltmartin92]

@@Foreignsgarage444 ^^^ sarcasm ...i can screw up anything

[@ak540i2]

Awesome stuff Gary. You think you can do a video showing the fill procedure for this transmission?

[@GaryFerraro]

will keep that in mind, There is 1st fill and 2nd fill. First fill is with engine off, fill it til it runs out, start the car and fill it again til it runs out. Drive the car and recheck the fluid, make sure there is a steady stream coming out, then the car is full

[@S14AA]

It it checked warm and running in neutral ? I could never find mention if neutral?

[@tothandras1243]

Hello Gary. Your videos are superb. I have a bmw 525d f10 with zf8hp45 tranny.During acceleration form stand, the car jerks (probably harsh tcc lock up), it doesnt matter if I start from 1st or 2nd gear. The shifts after that are fine, there are no fault codes stored, adaptation values are fine. Adaptation reset and oil and filter change didnt helped. Is the problem with mechatronics or torque converter?

[@GaryFerraro]

does this have a harsh 1-2 shift? or is it after the 1-2 shift?

[@tothandras1243]

@@GaryFerraro Its before the 1-2 shift. So if the car is in 1st gear during acceleration there is a drop in rpm (simliar to a harsh shift) and after that the shift from 1st to 2nd gear is fine. I suspect that there is a problem with torque converter clutch lock up.

[@tothandras1243]

@@GaryFerraro I made a short video about the problem. Thanks for your answer in advance. kzbin.info/www/bejne/oXebk4d_ZtyssNE

[@GaryFerraro]

@@tothandras1243 it happens at 3 seconds into the video?

[@tothandras1243]

@@GaryFerraro Yes

[@serkanakll1539]

zf8hp transmission 420341 kod problem nedir help

[@malodeonlp3768]

Hi, what should be the resistance of the green solenoid? Thank you

[@GaryFerraro]

I believe that is about 25 ohms

[@malodeonlp3768]

@@GaryFerraro thank you Gary

Hello Gary, my error code is 420012, could the solenoid be 100% defective or not, and if I change the new one do I have to program it? Thank you very much.

[@GaryFerraro]

what is the definition of that code

@@GaryFerraro 420012 Permanent electric pressure control valve D:Short circuit to plus

[@GaryFerraro]

you need to drop out the valvebody and ohm each solenoid

and if I change the new solenoid do i have to program it?

[@GaryFerraro]

No, maybe reset shift adapts but i would drive the car first and if feels ok leave it alone

[@markkingmonkey8798]

Hi Gary I have a 2018 Touareg, it has a 8HP45, it is stuck in park, fault code P17f900 fault description 'Parking lock mechanical fault', I have taken the valve body off and tested my each solenoid but they are all in range, is there anything else I can check? Im in England and no one on this island seems to know a thing about these boxes... any advice will be appreciated. Many Thanks

[@GaryFerraro]

Before you dropped the valvebody., did you try clearing the code? was the trans full of oil?

[@christopheredwards3]

I have a question unrelated to the video where do you get your torque specs from for the transmissions and tolerances?

[@GaryFerraro]

I have a manual on 8 speeds and sometimes use same specs as the 6 speeds

[@bronxbmw625]

Have you ever experienced the code 4eb5 output stage voltage supply code ?

[@GaryFerraro]

I have not, if you clear the code does it come right back?

[@bronxbmw625]

@@GaryFerraro yeah the code comes right back and all the power and grounds to the tcm are good

[@harvrindrsingh]

Isit recommended to change all the solenoids

[@GaryFerraro]

They are only sold as a set, i didn't want to have another issue so i changed them all but that would be up to you, you really don't have to

[@Acgcostin]

Hi, Please a need your help!!! I have 420341 error code zf 8hp ( bmw f30 2012 ) and i have pressure clutch C : 750.. I dont know why is so high. Do you know what can i do? Thank you so much

[@GaryFerraro]

What is the definition of that code?

[@Acgcostin]

@@GaryFerraro Gear - ratio monitoring during gearshift 4 -> X

[@lx4118]

How much will a repair like this costs ?

[@GaryFerraro]

i think this was about 1700ish, can run between 17 and 2000

[@harlabhsingh4349]

Hi Gary we have 2016 Dodge Durango ZFHP45rn transmission is not shifting 1gear there two code P0731and P0735 we drop valvebody try to air test we dont have air test plate plz if you have air test plate parts number let us know and give us your option to fix this problem Thanks

[@GaryFerraro]

Before you dropped the pan, did you check fluid level?

[@harlabhsingh4349]

@@GaryFerraro yes we remove trans pan and put properly right fluid and right level i cleared code then try road test and same thing and code came back

[@GaryFerraro]

@@harlabhsingh4349 ok, what do you feel, trans slipping? These are mechanical codes meaning the problem may be internal

[@josh6577]

Hi Gary I have the same car bought it at auction 2014 335i trans malfunction light on the dash and the car won’t turn over , Autel is saying transmission is engaged to engine 6th gear? And indicators are registering P on the stick and P on the dash. Can this tranny be stuck in 6th gear and causing the car not to turn over? Could it be a Val body issue or transmission issue?. Thanks

[@GaryFerraro]

whatcodes do you have

[@josh6577]

@@GaryFerraro I’m getting a CF20C1 No message group fault 3 receiver EGS transmitter, CAS/FEM/JBE/FRM also it shows, status of converter clutch lockup “Open”. Here is what the filling pressure of each clutch is registering Clutch A= -198 Mbar Clutch B= -172 MBar Clutch C= 106 Mbar Clutch D= 90 Mbar Clutch E=. 24 Mbar Rapid Filling Times Clutch a 16ms Clutch b. 4ms Clutch c. 2ms Clutch d. -10ms Clutch e. 9ms I hope this make some sense. I’m thinking the torque clutch solenoid is stuck in open?

[@GaryFerraro]

@@josh6577 Try clearing the code and see if it starts, computers may not be talking to each other for some reason

[@josh6577]

@@GaryFerraro ok thanks

[@luv_xxx2770]

how to know Solenoid color for bmw F02 ////2009 /// 6hp19

[@GaryFerraro]

Either drop the pan to look at the solenoids or there is a number on the trans that may begin with 1091 need the rest of the number. I used to have access to a chart. Would have to go online to see if it is still there

[@mercurymarauder2897]

It's nice to see you at your Best doing what you like doing, keep it up, Gary

[@factsoverfeelings9228]

Where can I get 8hp45 seals in 2024. Seemingly sold out everywhere !

[@GaryFerraro]

What seals are you looking for, an overhaul kit?

[@cartoontvkids9906]

Hello. When I run a ZF gearbox, there is a phenomenon of jerking from D1 to D2 and D2 to D3. What is the reason?

[@GaryFerraro]

Has this been scanned for codes? sounds like high pressure

[@loghomeonhill]

Thank you great video, all the Ohms matched but the GREEN (NB3) reads 24.5 Ohms. I'm hoping that's correct, what do you think ?. I decided to clean mine and use them again, all the ones on E-bay and Amazon are used ones anyway. Also I noticed you didn't change out any seals or gaskets, are there none on the 8HP45 like there are on the 6HP transmissions ?.

[@GaryFerraro]

The green solenoid is 25 ohms, The 8 speed units do not use a bridge seal

[@loghomeonhill]

@@GaryFerraro Thank you Gary, at the beginning of the video, while its on the bench is there a way to check if the output speed sensor before putting every thing back together?.

[@kennypham8585]

Very informative. Please do more videos

[@shaneswartz6053]

Thanks for this video Gary, very helpful as always. Question, do the internals of the mechatronics (between the two metal plates) ever fail as well? Seems like most 8HP issues are related to electronics, and not so much the mechanical components. Just figured I'd ask, as I don't see anyone ever rebuilding the 8HP's like I used to see the 6HP's being rebuilt.

[@GaryFerraro]

@@shaneswartz6053 I believe it does. I do a lot of valvebodies/TCM in the keep and Dodges

[@shaneswartz6053]

@@GaryFerraro ahh gotcha. Are those still somewhat similar to the BMW versions? I've noticed my 335i has the same valve body as the 3 series, 5 series, 7 series, etc...

[@GaryFerraro]

@@shaneswartz6053 They may look the same but may be different, must be ordered by vin number. My last post, i meant to say Jeep not Keep lol

[@shaneswartz6053]

@@GaryFerraro lol I figured it was Jeep, I just didn't wanna go full grammar nazi on ya! And yeah I just picked up a 328i mechatronics and it was identical to my 335i, but perhaps across the 5 and 7 series they may have some slight differences. I went on RealOEM and looked up the mechatronics unit and it had the same part # across all of them, so I assumed it was the same. I'm installing this replacement in my car this weekend, but going to swap over the TCM so I don't have to deal with the coding and what not. Fingers crossed it works!

[@GaryFerraro]

@@shaneswartz6053 Let me know how it goes

[@Highway-oo3nj]

Im in Australia how can I order these parts?

[@GaryFerraro]

I deal with a company in the UK called Automatic Choice Maybe that will help

[@XxXxRandoXxXx]

Hey Gary, do you know if the solenoids from the Chrysler 845RE and the ZF 8HP45 are interchangeable? I am not seeing a definitive answer online and the original blue/brown solenoid kits on my 845re seem to be impossible to find. thanks!

[@GaryFerraro]

Are they the same color?

[@XxXxRandoXxXx]

@@GaryFerraro Thanks for the follow-up! They are different colors than the ZF solenoids which are orange and white. I ONLY found a used set coming out of maktrans in poland but would much prefer a new set if possible. part number SL-KIT-845RE if you do a quick search of it. Maktrans is literally the only place i'm finding the correct set. Thanks in advance Sir!

[@GaryFerraro]

where are you located, you need the white and orange colors?@@XxXxRandoXxXx

[@aseelperformance8024]

I got a f10 2014 535i rwd that’s giving me transmission faults can I just swap it with a used one or should I rebuild it, and if I swap it how do I get it to work does it plug and work or do I need to relearn it, this is what the dealership told me “RAN SHORT TEST FOUND FAULT CODE 420321 GEAR RATIO MONITORING CLUTCHES A,B C, 4209A1 TEMPERATURE SENSOR HOT MODE1, 4209A3 HOTMODE 2. CHECKED TRANSMISSION FOR LEAKS FOUND NO LEAKS, FLUID IS LIFETIME FLUID. TEST DROVE VEH AND FOUND VEHICLE ONLY OPERATING ON 2 GEARS MAYBE2 AND 4”

[@GaryFerraro]

something like this i would double check fluid level, clear all codes, drive the car and see what comes back

[@S14AA]

no hard faults on 2012 bmw f30 having some strange shifting at 120km/h while accelerating. happens sometimes, usually after a down shift of 2 gears. it will then sort of lose power and jump between the top couple gears. almost feels like the torque converter unlocks but that could just be the feeling of loosing drive. All solenoids ohmn test ok, no fault codes, Im considering just washing them through, and refitting maybe swap the line pressure and solinoid B(6) with a couple others. the car has also came out of reverse while reversing up a hill the other day which was pretty wierd. i feel i should have looked closer at the values from obd and recorded hopefully during a mis-shift do you think flushing and cleaning the solenoids is an ok idea ? or should i replace thoughts. Thanks !!!

[@S14AA]

might note transmission has 230000km had 1 oil change at 120000km unit very clean inside (highway km)

[@dainiuspaulauskas3417]

Hi mister, great video!!! Question, I have ZF8HP55 in my Audi A6C7 Allroad 230kw. When I tested solenoid all of it shows 6.0 omhs. It means that all of it is ok or no? I think almost same like yours in video! Thanks in advance! :)

[@GaryFerraro]

Would think they are ok, Do you have a codes for a solenoid?

[@thomaskamawe9994]

Hi Gary.. My 525i 2008 model has being bringing transmission faulty.what could be wrong? You are highly recommended

[@GaryFerraro]

can you tell me what codes are present?

[@desertfoxn5445]

Hi Gary, nice video and very informative. I have a similar problem with my 2014 bmw 435i one night I went to grab something to eat and all of the sudden i got drivetrain malfunction pop on my dash, I pulled over, turn off the car and started it no luck the shift gear is stuck on park. These are the codes that I got is 420351 (Voltage supply output stages: short circuit to earth, permanent), CF3603/Intermittent signal and P0966 Pressure Control Solenoid B Control Circuit Low P0890 TCM Power Relay Sense Circuit Low. I cleared the codes except for 420351 is permanent and wont go away. I already ordered a kit for the mechatronic (solenoids, filter, fluid, etc) and hopefully this takes care of it. What is your expert opinion? I would appreciate it and thanks again. Note: I also have an 08 335i which i did the same method of replacing solenoids, filter, fluid and it works . I’m hoping the same thing happen here. More power!

[@abit5295]

Did it get fixed?

[@JoseMiranda-yx2lu]

Hello Gary , where is a good place to buy the solenoids for my 2010 Range rover??? Thanks for a great videos...

[@GaryFerraro]

where are you located?

[@serkanakll1539]

there is a delay when shifting gears and it is not fast enough can you please tell me what is the problem kodu 420341

[@Acgcostin]

I have the same error code and i dont know what to do

[@evanfasanella4178]

Hey Gary, great work, where did you get those solenoids? You mentioned Ericsons(?)

[@GaryFerraro]

I purchase from Transtar but eriksson's has them too

[@ScottPC]

In a shirt? Good man 😂

[@oscarllaver7531]

Se podría con subtítulos en español. Lo poco que puedo comprender excelente!!!

[@GaryFerraro]

Thank you

[@airratchetjockey7605]

Are those solenoids available through Tstar?

[@GaryFerraro]

They may be, i purchased from Erikssons

[@gtisch183]

Hi Gary. Outstanding video. I have a 2011 BMW 740Li and I was backing out of a parking spot went to shift it in drive and it wouldn’t go forward. I had to call a tow truck. It said Drivetrain Malfunction. My BMW mechanic scanned for codes and received a 420012 - solenoid short to positive. I purchased a complete solenoid kit, fluids, pan, gasket, bolts. Did you resolve the issue and does it seem like this will resolve mine??

[@GaryFerraro]

My problem was a solenoid, drop the valvebody out and ohm the solenoids to see if one is shorted

[@gtisch183]

@@GaryFerraro Hi Gary, I bought the whole kit to replace them all. They’re currently in transit to my mechanic.

[@GaryFerraro]

@@gtisch183 Let me know what he finds

[@gtisch183]

@@GaryFerraro I definitely will. 👍

[@stuckinthemiddlewithyou9998]

Thank you for this! There were 2 solenoids that were not changed though (a green and black one). Since everything is out, wouldn't it be recommended to change all of them? Also where can I buy quality (German) solenoids?

[@GaryFerraro]

those are the park release solenoids, they checked out ok, they are usually good haven't seen to many problems with them. Where are you located?

[@stuckinthemiddlewithyou9998]

@@GaryFerraro I'm outside of Chicago. I have a GA8HP45Z transmission. There are some rubber seals above the mechatronic unit (1 gasket and 3 tube-like gaskets) I'd like to replace as well. Basically anything that should be changed while I have it out. Thanks again.

[@GaryFerraro]

@@stuckinthemiddlewithyou9998 Do you have this apart? wondering if you could send me some pictures of what you need [e-mail] Do you have codes for the solenoids?

[@stuckinthemiddlewithyou9998]

@@GaryFerraro I don't. Wanted to get the parts before starting. It's an 8HP45Z transmission. Sounds like you aren't able to get the parts...if not no worries and thank you.

[@mehmety4954]

Thank you for sharing experience 👍👍

[@GaryFerraro]

Thanks for watching

[@joseramonrodriguezbendicho5578]

First of all, awesome video Sr. I have a 2016 audi A6 3.0t with the zf8hp55 i believe is a pretty similar to this one. i have had a pretty rought downshift from 3-2 since i bought the car with 20k, with a ocasional clunk most of the time when downshifting but also some times when upshifting 2-3 and i take the pedal of the gas slightly, not good on stop and go traffic for sure. its less rough on the mornings and it gets wors as i drive more during the day. im now at 52k and i did a fluid and filter service at 50k. after the service the issue went away for a couple of weeks but eventually came back again. i also had the adaptations reseted with no improvement. but after i changed the fluid the issue dissapear for a couple of weeks and the transmission downshifted smootly. i also noticed the adaptation counter for clutch B is way higher than the other ones, is currently on 158 times with a pressure fill of -1.5bar vs the other ones the adaptation counters are on the 10s or 20s. If you could give me any advice i will be forever on you debt Sr. Thanks for the videos, Keep the good work.

[@GaryFerraro]

I have had some cars with rough downshifts in Jeeps, i reset the shift adapts and it fixed it, How many miles on the car now?

[@joseramonrodriguezbendicho5578]

@@GaryFerraro 52k now. I have done the adaptation reset twice with no improvement.

[@vjxpiroevo9263]

hi gary how to reset ? @@GaryFerraro

[@GaryFerraro]

to clear the code you need a scan tool@@vjxpiroevo9263

[@vbautomatic609]

Hello Gary, thanks for yur vidéo. After rebuilding 8hp65a on Audi q7, the drive great but there is a bump when downshifting 5-4 only. No problems when upshifting and it happens only when i use the brake. No problems on S mode and manual. Just on drive. Have you ever met this problem? Any idea? Thanks Faouzi

[@GaryFerraro]

Have you reset the shift adapts?

[@vbautomatic609]

@@GaryFerraro thanks for your quick reply. Yes I did. Reset and standstill adaptation are performed with diagnostic tools. When I let the car downshift by itself, no bump . Only happens when I am using the brake pedals in D mode 5-4 only

[@GaryFerraro]

When you reset the adapts did anything change and then go back to the way it was ?

[@vbautomatic609]

@@GaryFerraro when the adaptation are reset and performed. No change are noticeable and the bump from 5-4 still present. What's strange is that the downshift are smooth when you are in sport mode, manual mode and when you don't use the brake. It occurs only when brakes are applied.

[@GaryFerraro]

@@vbautomatic609 ok any codes in the Trans or engine, wondering if the adaption is not working, you do have an option to reset them correct? Usually something changes when they are reset

[@harvrindrsingh]

Hi. After changing the solenoids do we need to reprogram it

[@Archer8638]

No reprogramming is required, Adaptation data will be stored in control unit.

[@GaryFerraro]

@@Archer8638 Thanks for answering. lol

[@cedric60666]

interesting but much too long, the same could have been explained in 10 minutes

[@luv_xxx2770]

hi boss we have bmw with fault code 420012 we test all solenoids it ok //// wht can test to clear fault

[@luv_xxx2770]

sir can tell us the green color how many ohm if good

[@GaryFerraro]

I think it may be 25ohms, have to check though, i have an 8 speed body at the shop