Peugeot 407 2.0 HDi - Aisin AM6 6-Speed Transmission delay (3rd to 4th Gear)

[Tharaka407]

Hi everyone,

I need some advice regarding the Aisin AM6 (TF-80SC) 6-speed automatic transmission on my Peugeot 407 2.0 HDi. The car has covered 151,000 KM.

I recently changed the transmission fluid, but I am experiencing a severe shifting issue specifically between 3rd and 4th gear. When moving from 3rd to 4th, the gearbox completely loses drive and goes into a "Neutral" feeling. The engine RPM shoots up rapidly, and it stays unengaged for about 2 to 5 seconds. After that delay, it suddenly and instantly slams/engages into 4th gear. Once it's in 4th, the car drives perfectly normal.

Because it feels like a total loss of hydraulic pressure during the handover from 3rd to 4th, I suspect the valve body or the specific C2 clutch linear solenoid is failing.

Has anyone experienced this prolonged 5-second flare on the AM6 box? Is the valve body completely shot, or is there a specific solenoid kit / software adaptation reset that can save it?

Thanks for your help!

[mickthemaverick]

There is a long thread discussing this gearbox and its issues which should give you the guidance you need, this link takes you to the first post so you will need to work through it to get the most benefit:

viewtopic.php?p=541556#p541556