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2008 GMC Yukon Hybrid Questions

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I have a Yukon hybrid, I was driving and I noticed it wouldn't go into electric mode when at a stop light, all of a sudden in the middle of driving, it jerked forward and stalled. check engine light came on and onstar stated that there was a problem with the electric propulsion system. took it to GMC dealer and they cant figure out what is wrong with it. Thank you in advance.
After stopping at red light or stop sign when I take off my car will stop suddenly and then jerk forward and go again. This seems to be happening more often. I am very worried thst I am going to get rear-ended. I took it to GMC and they said the motor mount was broken. That has been fixed I have had car back for 2 days and it is happening again. Sometime the check engine light will come on after this happens, and On-star said the code was for engine propulsion system. Any ideas what is going on. I have seen others complain about this but jave never seen a ansewr to tje problem. Please help! Thank you.
109,000 miles on Truck...
Battery R & R by GMC $300 and now GMC did a diagnostic and want to replace a ECM board $700? I have driven the truck with light on for 1500 miles and it is running fine to my knowledge.

I have a Rear Main Seal Leak Also that I reported to GMC before 100,000? They/Dealership is willing to take 10% off the cost... I may buy a Toyota !!!!!


car has not been started in a month. I charged the 12 volt battery already is there a way to jump the hybrid one
car wont start I think the bib battery is low iv charged the 12 volt one already
This noise seems to be coming from the rear of the vehicle and I've notices a slight to medium hesitation when in reverse


Getting no codes
This noise seems to be coming from the rear of the vehicle and I've notices a slight to medium hesitation when in reverse (like when you give it gas it hesitates to back up). This started late last week or early this week :)

Getting no codes
DEALER WANTED $150 REPAIR, I THOUGHT I COULD DO IT MYSELF, I OPENED THE HOOD, REMOVED TWO BOLTS WHICH LOSSEN THE WHOLE ASSEMBLY BUT STILL ATTACHED SOMEWHERE,CAN YOU HELP?
THANKS, JOEL W
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