Touareg: 2004 V10 TDI
Join Date: Oct 2007
Location: jhg, kl
Second Vehicle: is not a VW
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I had the same problem with my 2004 v10 tdi... It would down shift hard while cruising at highway speeds (100kmph+), when you step on the pedal (not mash it), but enough to make the tranny need to downshift, BAM, it would slam down a gear or two... Sounded like something was going to break, my girlfriend was scared...
After reporting it to the friendly dealership at Fifth Avenue Auto Hause in Calgary, AB, the were able to reproduce the problem many times, over and over.... After talking to VWOA, they confirmed they would do a software update, and replace the valve body at no charge under warranty... This was about 2 weeks without my vehicle.
I got my v10 back, and no problems for the first day... The first cold start the next day, it would slip up-shifting, until the engine/tranny fluids warmed up... I brought it back, and they decided they needed to drop the engine and tranny. Upon doing so, they discovered an oil leak from the driverside turbo was leaking oil into the intercooler. VWOA ok'd the dealership to replace both turbos at no charge!!!!!!!!!! (at the time, vehicle only had 38,000kms...).
So, exactly 30 days later, new turbos, oil seals, everything, including a brand new tranny, everything is working good. Just sucks balls that it needed to be gone for so long. The turbo dieing after only 38,000km is unjustified, as well as the tranny. My only conclusion is, faulty tranny design, and the original owner of the Treg (bought at 23,000km) must've not let the engine/turbos cool down after hard runs, therefore, destroying the turbo seals from heat.