Hi there! I have a 2008 Yukon hybrid and yesterday I took a far trip about 8 hours, when I reached my destination everything was fine but suddenly when I went to take off from a dead stop my truck barley wanted to go no matter how much gas I give the truck it barley takes off from a dead stop but when I get the truck going it shifts and drives just fine… but as mentioned only from a dead stop I’m having problems also when it goes into auto stop the car will not move in electric the battery is reading normal volts and will come on and off as usual… I’m getting code P0700 if anyone can help it would be greatly appreciated

 

P0700 is a generic Transmission Control Module (TCM) fault indicating the TCM is the source of the CEL.

You likely need a professional grade code reader to read additional codes.

 

look at the freeze frame data you can snag the code from there


most likely the Aux pump is dead or almost dead
this deals with the first and second gear pressurization of the transmission this is why most people have issues the firsts and second gear (mine is going out tooo)
here is the info on the codes when you get it
P0700
MY08_AHS2_HybridCombinedCertDoc_Official_28Jun07.x ls (gm.com)

does it work in M4?

P0700 08-07-30-021G 1..21 (nhtsa.gov)

The transmission may not shift or defaults to 2nd gear. as you claimed you said it moves slowly then gets going Don't DRIVE It fast in second gear you don't want to damage the transmission
also FYI it's also common for the connector to back out on the transmission
see the TSB


also check the battery connections these come loose over time due to poor craftsmanship or design.. BUT get the codes first