@GM - Just put my 2021 Sierra in shop (P0300 code) Seems to be an extremely common issue. Dealership says parts to repair are backordered and many trucks are ahead of me w same issue - no loaner trucks. Please help.
@jeffcox800 Please click on the link below to continue this conversation as a Direct Message. Be sure we have your name, address, store location & ph# for documentation. I would like to look into this further. https://t.co/tHt6mTEaii (2/2)