2011 Cubman S, 44k miles, studder/popping at start 20 secs with erratic RPM. Pushing gas pedal did not result in much rpm gain. The1/2 power tachometer icon came on. Icon self cleared. I drove 50 yards and the car very slightly bucked. 1/2 mile, icon returned and half power. Pulled over a mile later. Turned off, waited minute or two, turned on. 1/2 still on. Turned off/on again and no 1/2 icone. Noticed later (so not sure when it came on) Check engine on big dial illuminated. Used MTTS dongle to pull these codes:

B202C
P062E
B202E
B202B
P025D
P025E

This whole sequence happened about week and half ago, and all check engine lights cleared them selves.

Taking bets!

 

Resolved. Dealer diagnosed as HPFP, replaced for free under extended warranty. Symptoms have not returned.