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1.I have a 2004 GMC ENVOY THAT stalled when I was driving and never started again .I scanned it and gave me a p1516 code. How can I fix my truck. Can anyone help me out.

Vehicle: GMC envoy 2004 4.2l

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P1516 Throttle actuator control (TAC) module throttle actuator position performance

 Poor connection are the most popular problem for setting P1516. Here is a GMC that set a P1516 pulling on the yellow wire you can feel the disconnection , The fix was to replace the connection. You can also disconnect the connector , and reconnect , by doing so you tend to make a better connection ,  Most of P1516 are caused by poor connection at the throttle body

 

 

Here is another GMC with P1516 which was the only code. the harness was check for break that occur at least a inch away from the connection,This vehicle was verified that the throttle  valve was not at the rest position and there was a bind with the throttle valve. The only solution was a replacement of the throttle body. 

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