You Sure this is a TMG truck...I don't think their codes will show an A before the code...is it a TMX AC Drive truck? If so following is the description for a code 66:
When battery level reaches 20% or less or (10% on the dash display), the current level for the drive motors is reduced to 50% of the programmed level and the lift function is locked out.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.