fpb111

2012 991C2S, 3.8 PDK CAB

Running in traffic @~1100. PSM OFF WARNING, THEN START STOP OFF pops up in multi display yellow warning stays in background.
Any clues?

BGLeduc

Battery would be the easiest thing to check first. Some seemingly odd warnings occur when a battery gets weak.

timothymoffat

+1 Seeing more and more similar threads (different warning lights) as these cars age. They most definitely throw a tantrum when the battery gets old.

asellus

It must be november! How old is your battery? Given 7-10 years for AGMs, if you're on the original battery it's probably finally dying. Automatic start/stop deactivation is caused by insufficient battery capacity, among other things.

fpb111

Thanks guys.
Battery was my first thought. Picking up H8 AGM Sears gold at my local parts house.
Current battery is at least 5 years old. Installed by Do-we-screw-em-and- how used car lot. It is also under sized for the car.
I have stretched it by having it on a maintainer when not driving it.

Larson E. Rapp

You also see these sorts of messages when one or more coil packs is on the way out.