F125 Multifunction switch replacement

[dpatel710]

It rained today and when I parked the Cayenne at my apartment, the dreaded "PRND" light up and it prompted to move the gear selector to P or N. The actual gear selector moves fine and displays the light next to whichever gear it is in. 

 

Pulled the codes with vag-com and it came back with - 

00293 - Multi-function Switch (F125)
008 - Implausible Signal

 

Has anyone here had experience with replacing the F125 multifunction switch? 
If so, would it be doable in a parking lot/have any tips for its replacement? 

 

 

[lewisweller]

5 hours ago, dpatel710 said:

It rained today and when I parked the Cayenne at my apartment, the dreaded "PRND" light up and it prompted to move the gear selector to P or N. The actual gear selector moves fine and displays the light next to whichever gear it is in. 

 

Pulled the codes with vag-com and it came back with - 

00293 - Multi-function Switch (F125)
008 - Implausible Signal

 

Has anyone here had experience with replacing the F125 multifunction switch? 
If so, would it be doable in a parking lot/have any tips for its replacement? 

 

 

This may help 

 

https://www.renntech.org/forums/topic/50725-cayenne-2009/?tab=comments#comment-283829

[dpatel710]

Thanks Lewisweller! That's one of the only posts I have been able to find in regards to the F125. 

 

This switch was a common failure point for my old Audi so I'm going to try the swap this weekend. The factory repair manual procedure doesn't look too bad but I won't know for sure until I get in there. 

[lewisweller]

18 minutes ago, dpatel710 said:

Thanks Lewisweller! That's one of the only posts I have been able to find in regards to the F125. 

 

This switch was a common failure point for my old Audi so I'm going to try the swap this weekend. The factory repair manual procedure doesn't look too bad but I won't know for sure until I get in there. 

Yeah I would try just checking first the plug is not wet or corroded. Especially after it only occurred after Rain. 

[dpatel710]

Solved. 

 

The multifunction switch was fine but I installed the new one as a part of the troubleshooting process. 

 

The problem was a result of the plastic sleeve within the shifter cable separating from the body, causing the cable to fall off the transmission pin. Thus, when moving the shifter in the car, the trans stayed in gear and didn't match the shifter - triggering limp mode. 

 

It is possible to access the F125 from the bottom of the car without removing the drive shaft or heat shield as the factory manual states. I simply bent the heat shield back enough to have room to work with a 10mm wrench. 

 

The switch is is straight forward. When the shaft is vertical, the transmission is in neutral. 

 

I am going to try jb weld to repair the shifter cable sleeve so that it will stay on. 

 

[dpatel710]

Update: JB weld failed due to the temperature in that area. 

 

After doing some digging, I found a replacement bushing so that replacement of the shifter cable can be avoided. 

 

https://www.bushingfix.com/porsche-cayenne-shift-cable-bushing-repair-kit/