edbso

Attention moderators as this is the 722.6 transmission please move to a more appropriate forum if necessary, Thanks

The car has been near perfect the last 8 years. The transmission now under very light acceleration shifts 1 to 2 at 2100rpm, 2 to 3 at 2300rpm and 3 to 4 at 2900rpm.
By briefly moving the shift lever to the right I can shift up earlier and into the high gears including 5th on the highway.

Transmission history:
Apr 2016 91,000km 56,875Miles Dropped the pan, cleaned, new filter and gasket used Shell 134 the approved fluid.
May 2018 138,700km 86,687miles removed drain plug and filled with Shell 134.
Aug 2023 203980km 127,487miles removed drain plug and filled with Shell 134.
The transmission color was and always is a bright fresh red.
March 4 2024 did the transmission plug and immediately upon the test drive the high shifting commenced. I noticed the plug was leaking when I changed the engine oil.
I have taken the plugs our of the transmission control modules and both were dry. Replaced after using an electrical cleaner and lubricator.
The highly reputable transmission shop feels that all the gears are there and that some unknown sensor is telling the transmission to hold the car in gear as though I am accelerating aggressively when actually I am using only the lightest of acceleration.
Only stored code is for abs and the abs works perfectly with no problems (likely set in winter with low battery voltage).
Current 218000km 136250miles.
Anyone experience this, ideas please.

edbso

I always go to the last item worked on to troubleshoot. Today I disconnected the transmission plug. It had a bit of transmission fluid on it. Using a mirror and flashlight it appears as though all the pins are there and straight. I flushed the external plug several times with an electrical connection cleaner and then used DeoxIT to additionally clean and lubricate. Then I sucked it in and out with the leaver several times and re-cleaned. No change on the test drive still shifting high and late on the very lightest of acceleration.

It is almost as though the emissions system thinks the car is stone cold and holding it in the gear longer to heat up faster and reduce emissions.

Going to an Indie Monday for a full diagnosis.

John CC

A long shot: You didn't accidentally put it in "Sport" mode, did you?

edbso

$750 fixed it. New Conductor Plate. Very slight signs of wear in the pan or on the magnet. I think of it as being preventative maintenance, would have liked to have done it later than 136,000 but OK now.

kajtek1

Did you replace pilot bushing?
That cheap part is responsible for over 90% of troubles with those transmission.
Lot of conductor plates are replaced becouse of neglected pilot bushing.

edbso

While I don't know for certain as an Indie did the work I suspect not.
Do you have a part number and illustration for future reference? Thanks

kajtek1

Amazon usually is the best place to buy OE.

edbso

Thank you and yes the plug was leaking earlier and a new one was installed.