FYI for tranny malfunction

TheFixer

Specialist
Aug 16, 2020
88
Tennessee
Here's an FYI for those with the 6AT. I lost forward and reverse yesterday just out of the blue. No codes at all.

I dropped the pan and mechatronic valve assembly and found my bridge seal cracked.

This will cause a no forward or reverse issue.

It is pretty brittle after 140k miles.

I think the failure may have been accelerated due to changing the fluid last month.

Anyway, if you plan on doing a filter and fluid change you should go the extra step and change the seals and mechatronic valves because it's right there in your face.

That's all folks.
 

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TheFixer

Specialist
Aug 16, 2020
88
Tennessee
Forgot I posted in two sections..... I'll update here too then. :)

Finished the valve body rebuild last week with a Sonax zip kit, ZF seals and ZF solenoids. Can't believe how much smoother and responsive the trans is now. With xhd in stock flash I can't even feel the car shift through the gears. Well worth the time and money.

Not difficult to do and quick to do.

Put this on your list of mods even if you think the trans is fine. The parts in the sonax kit are a huge improvement of what's in the stock valve body.
 
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derekgates

Lieutenant
Feb 23, 2018
651
NW FL
Forgot I posted in two sections..... I'll update here too then. :)

Finished the valve body rebuild last week with a Sonax zip kit, ZF seals and ZF solenoids. Can't believe how much smoother and responsive the trans is now. With xhd in stock flash I can't even feel the car shift through the gears. Well worth the time and money.

Not difficult to do and quick to do.

Put this on your list of mods even if you think the trans is fine. The parts in the sonax kit are a huge improvement of what's in the stock valve body.
Oh I bet, those are some critical parts.

I don't have AT, but instead DCT and I was having driveability issues. I decided to do filter and fluid change... and it actually helped quite a bit! Sounds like a similar revelation to your experience. :)
 
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