I've noticed that if I let the car sit without driving for 10+ days I get transmission fail errors on startup. If I shut off then restart its fine. Anybody else have this problem? This morning it let me reverse out of the garage but would not engage any forward gears until I "rebooted" it.
2009 C2S PDK with Sport Chrono.

 

don't let it sit

just kidding, I know sometimes we don't get to drive our toys. I know on some other high end cars it is recommended to plug them in if they will sit for and extended period of time. I use my 911 as my daily so I'm not sure if this is the case with it.

 

Might be in a trans/lock mode. I believe there were supposedly some cars that had a recall for a software update? Might want to check with the dealer though.

 

You might want to use a battery maintainer. I think the battery is losing juice. Either that or drive it more often.

 

It happens to me often, if I let the car sit for 3 weeks or so...

 

What he said.

 

Had the same problem with my 2009 PDK. Went to the dealer, he reflashed the ECU with the latest software. No problems since (6 months).