Code PO1516 on my 2008 GMC ACADIA

Question

Traction control light came on and power was derated and had no throttle

Answer 1

Code P1516 ThrottleActuator Control (TAC) reduced engine power. Try this link http://www.acadiaforum.net/24-engine-drivetrain/10369-code-p1516-throttle-actuator-control-tac-reduced-engine-power.html#/topics/10369?page=1.