On a completely stock 2006 Sierra, LS1b, 12606807 OS, with Allison 6 speed. Pedal position goes to 100%, but the throttle blade flatlines at 53%. {D0301} is disabled, {D2001-2003} are turned off. {B6614} is set to positive 640 lb-ft.

Traction control is inactive. Are there any other tables that are allowed to limit the blade position?