Hi. Last week I bought a CL600 from 2008 in Germany and drove it home (to Sweden).
On my way home I spent a night at a hotel, about half way home.
The next morning the car was of course cold, and made TERRIBLE gear changes to second & third gear!!!
The guy had me fooled of course, by showing the car all warmed up!
My mechanic says that the car does rev quite high before it moves, even when warmed up (like a manual car with clutch all worned out).

So I now have three choices;
- Flush the gearbox for about 500 dollars.
or
- Buy a used gearbox at eBay, för about 1.000 dollars.
or
- Renovate my gearbox for about 2.000 dollars.

What would you guys choose..?
And do you have any experience on this matter perhaps..?
Oh, and btw the purchase was made from a private person, so no use in even call him about this. It's an obvious con.

Thankful for your thoughts!

Best regards
Roger

 

I feel bad for you...I got hosed on a private sale on my CL also. The seller was a liar--so disappointing. Before you start spending money, have you run a Quick Test on it with a code reader--preferably a real Xentry setup? It might point you in a more precise direction. Could be something minor. With that said, if you plan to keep your car a long time like me, I replace everything I can at points like this, because after 18 years of use the parts are worn out and need refreshing. Seals have gotten hard, plastic brittle, electronic connections deteriorated. Are you going to do some of the work yourself?

 

Diy a drain and fill. Once you verify the issue is there with new fluid at the proper level, you can make the best choice. There is no way to know if a used part will fail after install, so imo, a rebuild would be the way. Make sure you consult with someone that has STAR DAS in order to properly diagnose the faulty part or function.

 

OK, thanks! Yes a diagnos on the gearbox is a good idea!
Hopefully that shows us something!

Yes I'm planning on keeping this a number of years, for it to be driven some few miles summer time.
On tuesday it's going to the mechanic...and I think we have set our mindes to a couple of oil changes, without flushing.

 

Keep us posted on your progress. FWIW, you should probably replace all of the fluids, unless you are sure they've been done previously. Also, clean out all of the drains around the windshield and sunroof, in case the former owner never did--prevents water incursion and the assorted troubles that come with it.

 

Thanks for the the info!
I will.

 

I bought a 2007 CL600 with similar issues of gearbox slipping. I scan and it has speed sensor y3/6n3 codes so i am starting out with replacing the conductor plate and upgraded solenoids with full trans service and resetting codes and adaptations. This is probably the cheapest and most impactful route starting out. Are you able to scan the car, mine has no CEL but it’s going into limp mode

This is not a surprising or unexpected issue at this age but what mileage are you at? We have the 722.6 transmission and this is a common issue when the fluid hasn’t been changed even more so on the hot and heavy v12 I’d suspect

 

If you with CEL mean diagnostic errors, my car showed no errors (zero) when we did a diagnostic test on the transmission.
On tuesday Dec. 11 I'm flushing the gearbox.

 

I can now tell you, that in my case the flushing did not help one bit. :-(

 

Sorry to hear but hopefully you can source a v12 722.6 to use? Or will your mechanic help rebuild it?

i think the previous owners of these cars got too happy with the paddle shifts not knowing what they are doing and burning the clutches up

i did do the service on mine and all codes went away except “slipping in gear 4” but I ran out of new trans fluid to put in, I’m hoping a proper fill will fix that but if not I’ll be in the same boat

 

We now, after a couple of days "think" the high reving from a stand still have gotten better...so I'm giving this some more time to improve itself before I do a rebuild...

 

I got mine all put back together and its driving normal until it attempts to shift into 4th. Car is scary fast btw I’m in love with it!!! I reset the adaptations but it’s still doing the same thing, I think I’m missing something within the menus. I reset the shifts but maybe there a certain values/ratios that need to be entered or you need to code the shifts some other way?

i left it alone for now since i only bought this car as a future project/toy but i am contemplating parking the car for a year and saving up to get an upgraded transmission or rebuild kit, it sucks for sure but if man built it a man can take it apart and do it again! Don’t give up, let me know how things turn out