so after installing a new throttle body(because i got a code saying it was bad).i have been intermittently getting a code 1516.i went on youtube and most videos made reference to a bad ground.does anyone have a engine wiring diagram for 2008 4.8 chevy express.apparently a silverado has a throttle control module as to where a express van doesnt so i wanna be clear on the demon im chasin...

 

https://www.engine-codes.com/p1516_chevrolet.html

just follow the harness back until you find a ground point

 

Usually a ground right on the front next to the radiator neck

 

so heres an update.....the code is generic and doesnt pinpoint what the problem is.....turns out to be the gas pedal.the code seems to be different between vans and pickups.

 

Bump.