Is this model a interference or not interference engine? I think the timing chain has been stretched. It has 153000 miles.
It’s giving me code P0011. I’ve change crank and camshaft sensor, solenoid, oil change. I’m not sure what else.
If it is actually out of time, it would be pinging on regular gas because the timing would be advanced too far to run on 87 octane
If that’s not happening, i would ignore the code
And it’s a non interference design
Timing chains on GM 6 cylinder motors have never had a stretch problem. If you’re having running problems with your motor start with reading all the engine data with a $3000 scan tool to make sure all the sensors are working with in spec.