GMC Sierra 1500 Hybrid Questions

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i drove the truck this morning and all the gauges were funky. Check engine light came on so I went back home and shut the truck off . It won't start and it says Hybrid system needs serviced. Help
my dealer told that gm had a bulletin on this but they could not fin today. the bang does not happen all the time. but can feel some under normal braking
I've noticed on numerous occasions that my 2009 Sierra Hybrid has problems finding the right gear when applying the accelerator from a dead stop. The truck starts to move but then you feel an abrupt and significaqnt ...