Have Code P1516 and P2135 On my 2007 GMC Denali. What do you think it might be/

Question

My engine keeps shutting down. I have to wait 15 to 30 minutes before it will start again.

Answer 1

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

P2135 Throttle position (TP) sensor 1-2 correlation

When P1516 set this is mostly seen as a failed connection to the throttle body, Do repair the pigtail connection rather than the throttle body .