DL501 OB5 Mechatronic discussion

A5/S5/RS5
#21

Yes! Great to hear. You did all the heavy lifting, I was just a muse.

So the 2nd/R solenoid…do you think it was the wrong part? Perhaps a change Audi made for certain years?

I know it’s not terribly difficult to replace the parts on the mech short of having to bore out the thermostat housing.

Special equipment is needed for that (still doable at home) as well as pressure testing the valve body which is what worries me a bit along with proper cleaning/flushing.

I do get out to VA every so often, have good friends in Arlington.

I bet you’ll be happy if you do not smell ATF fluid for a long, long time. Glad it’s solved and keep us updated if anything changes.

Once you’re sure it’s fixed and you’re ready, contact me about a transmission cooler.

#22

No, it was identical to all of the other solenoids that connect to the forks, and to be honest i might not have been defective. Could have just been something not 100% aligned upon previous installations. Although, i find that hard to believe.

hahaha, i have a few more days of smelling it. I need to thoroughly clean my under carriage and clean the garage.

Can you send me a link to the transmission cooler? I’m really interested in it, but i need to make sure a couple other things are squared away before committing. I’m also at 147k miles now, so i’m trying to determine if upgrades are worthwhile… or just save money for the next one.

#23

http://www.redmistracing.com but I posted a video earlier in the thread too. There’s a thread in this section on it as well which has more info. I’m still working on the web site and deciding who I want to go with so it’s a temporary basic website with a points of contact.

Totally makes sense to evaluate given the mileage. If you go for a newer B8.5 with less miles, it’d transfer over obviously. But given the cost of the cooler kit and the miles on the car, I’d probably skip it unless you plan on keeping the car for another few years. But interesting your mech made it that far before having a failure.

#24

A few pics from my last gearbox rebuild. Thought this thread might find them useful. I’ve been advised the grey and blue cables on the mechatronics cable harness are Gen1 and the multi colour harness is a Gen 3. The kit in the plastic container is a mechatronics rebuild kit complete with clutch solenoids and cabling harness.

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2 Likes
#25

More porn pics… love it !!!

1 Like
#26

Where did you source the full rebuild kit from?

#27

I’m pretty sure this is the kit;

#28

I’d be nervous buy a Mechatronic kit from anywhere but Audi as I see there are Chinese sellers on Ebay and Alliexpress selling repair kits that you know have to be junk. Do you know who makes the parts for Alltranz?

#29

It’s sold as a factory original repair kit - whatever that means. I had blind faith in my mechanic to get the right kit and I’m very pleased with the result. I think my clutch solenoids were suffering intermittent contacting with the harness which cause clutch pressures to drop under heavy load.

#30

Pretty impressive that you can do the job yourself. I would just ship it off to a specialist or ask audi if they will fix it as there are too many of those flawed.

#31

Hi Ape_Factory. and All here. I own a garage and work as an auto technician but dont have much experice in DSG transmissions. Have a 2013 Audi Q5 2.0 Diesel with DL501 transmission. Giving me DTC P17E100 (Gear Actuator 2 Mechanical Failure. And when I drove it, it doesn’t change 3rd or 4th gear. Removed Mechatronic unit. No debris no metal particles found. Given the data here, checked the resistance of all solenoids. Two Solenoids N435 and N439 have resistance 13.8 while your data shared here say 15. Apart from this, everything else look fine. Please advice. Will be much appreciated. Thanks

#32

Could be a combination of electrical and the actual solenoids. There is a repair kit sold by Audi which replaces the PCB board and two solenoids. I can’t remember which two off the top of my head.

There’s also this TSB which pertains to the S4/S5 so may not be applicable. https://static.nhtsa.gov/odi/tsbs/2013/SB-10051783-6671.pdf

My money would be on the PCB/Solenoid being bad. It’s a common error.

Here’s a really quick read that’ll get you somewhat up to speed: https://andybucks5.blogspot.com/2018/08/audi-s-tronic-gearbox-reliability-faults-tuning-repair.html

Even Amazon has the repair kit believe it or not!
https://amzn.to/2OrtEkU

The part number is 0B5398048C but double check that’s the right one for the Q5 2.0TDi.
-Michel

#33

Hi Michel. Thanks. Since this is not the right one for my Q5.
Let me search the right one for Q5 either on ebay or Amazon . I will get back here once the fault been rectified.

#34

Hi Michel
Thanks a lot for your help and advice. I replaced the repair kit and car is like new now. No DTC no Dash Lights.
Thanks again for your help and support.

2 Likes
#35

Congratulations. I have a new repair kit sitting in my cabinet, ready to go in my S5 or RS5 as needed. RS5 has a newer low mile 2015 transmission so I assume the S5 will need it first but we’ll see.

1 Like
#36

Oh great! Good news and glad I could help although you did all the heavy lifting!
-m

#37

Hi all - new to this forum. AF - your posts are incredibly helpful. Have a stock B8 2011 S4 that I have babied - all maintenance and very low miles - 48k. Was driving from Houston to Dallas and felt a little frisky - was going ~100mph over a fairly long stretch, and suddenly got full limp mode and no odd gears. Towed to dealer, code was clutch 1 temp too hot, reduced torque. Dealer didn’t want to touch, saying need new tranny. Had a reputable local garage drop the pan - no shavings or burned smell - has me thinking it’s likely mech unit.

Had the garage perform the mech repair per the TSB - still no luck, cleared codes and the temp code came back, even at a cold start. Could it be a bad temp sensor or perhaps the cooling valves? For now, I asked the garage to drop the mech unit again and I’ll test the resistance on the solenoids - any other suggestions? Much appreciated!

#38

Yes, with the mech dropped, have them take a look at the clutch cooling valve. It may have gone AWOL.

Replacement part can be found here: https://www.sonnax.com/parts/4279-oversized-clutch-cooling-control-valve-kit

I’d also have them look at the clutch discs and see if they’re worn on the odd gears or see if you’ve burned the faces from overheating.

#39

I’ve just replaced mine with this very kit and all is good now :+1:

#40

Some disappointing news to share - after cracking open the internal filter, we found some debris in the cartridge. Guess I’m now looking at a clutch pack rebuild.