Most Aston Martin DB9’s, DBS and Rapides between 2004 and 2014 were fitted with a 6-speed Touchtronic II Automatic Transmission (if you have a manual shift, you are a lucky duck). I’ve already written a few times that this transmission is really a ZF model 6HP26 that was fitted to many other cars of the era including Rolls Royce, Bentley, Jaguar and BMW (to name a few). The transmission features Shift By Wire (SBW) meaning that there is no lever or linkage doing the shifting, but rather a set of electronic solenoid valves inside the transmission (the Mechatronics Unit). When you push the shifter buttons on the center console, they are really just sending electronic signals down to the transmission control module (located inside the transmission).
If there are electronic signals, then there must be wiring that plugs into the transmission somehow. This is done with a large multipin electronics connector that twist locks into something called the Electronics Sleeve. The Electronics Sleeve’s job is to create a leak free ‘tunnel’ through the transmission casing allowing the electronics connector to mate up with the mechatronics unit.
The Electronics Sleeve is known to leak. It has two large O-rings that seal it to the transmission casing, and these O-rings start to flatten out over time in all the heat of the transmission (see photo below). My car had this issue and you can see some signs of a ‘weeping’ oil leak that then blows back over the casing and the differential.
Removing (and replacing) the Electronics Sleeve isn’t particularly difficult (or expensive), and I replaced mine as part of doing a full transmission fluid, filter and seals change. I’ve created an extensive series of articles on this process that you can check out here. Let me show you how to remove the Electronics Sleeve. Continue reading “Removing the Electronics Sleeve from the Automatic Transmission in an Aston Martin DB9”