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Strange tranny/electronics fault

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I actually had 300 miles trouble free driving with no error lights after switching out my coolant pipes and replacing emmissions tubing but the latest issue is very odd.

In drive and slowing down suddenly the drivers shift display lights up all gears as though all are selected simultaneously in manual AND the drive light on the other side. Chages go from smooth to rough. I stopped the car turned off the ignition, restarted and lights and shifting went back to normal. This problem has happened randomly and several times today. After the last time, I reset using the ignition again then I turned off PSM and used Tiptronic to blast up through the tranny to about 80. The problem hasnt returned for the last 20 miles or so. Any thoughts? I thought it might be worth pulling a fuse for the tranny module to get it to reload....


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I would check for water/coolant that might have gotten into the gearbox range selector switch located on the side of the gear box. Remove the electrical connector and clean with a good contact cleaner or WD-40.

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  • 9 months later...

As Wvicary said, clean any and all connections with a good contact cleaner / enhancer. When all gears light up like that in the selector means the Transmission Control unit has a fault and it is in limp mode. Here is a very good cleaner / enhancer, you might find it on Amazon cheap, it's called ProGold.

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