I pulled out the bulbs so I did not kill battery, just arrived at hotel for my vacation. Been reading blogs how others changed with and still have same problem

My 2011 Silverado – Turbo, Duramax - diesel is having a problem with the 'Check Engine Light" coming on with error p20e2. I have taken it to a Chevy Dealership on 4 occasions, each time they tell me it is an error with one of the sensors and that there is nothing wrong with the exhaust gas temp.

Other than ignoring the ‘Check Engine Light” each time it comes on, what can I do to resolve this issue?

it wont turn over

I read a lot complaints about DEF poor quality problems on many forums and same thing happened recently to my truck after 24k miles. There is any permanent fix to this frequently failing system since even repaired, is failing again?

Smell of raw diesel wiffs into the cab every once in a month or so. A small bit of smoke sometimes from under hood. Then it vanishes away. Can never reproduce in shop. All clamps tightened and retightened. Has done this since it was new. Had to dealership. Can find nothing. But now out of warranty.

tank overflows a quart of fuel on ground.

happens all the time!

work in oil field go down dirt road,getting alot of fine dust around intake port and throttle body

Wired a 7 way trailer plug in bed. when I turn on the right turn signal all the trailer lights flash. When tested with a circuit tester it all checks out fine. the original bumper plug works fine. Tried hookig it to another trailer and had same result??

How much gain in HP & torque with a aftermarket dual exhaust system with X pipe vers the OEM exhaust system?

Where is the best place, or is there a vacuum port on the intake manifold? This is on a 2011 2500HD 6L engine.