I suspect my company swapped engines. Is it possible?

More probable that the ECM got swapped than the motor. Don't know how many hours to swap a modern motor, but it would not be quick, easy or cheap. Hard to see the incentive. Swapping ECMs makes way more sense.

Or, as said, someone ran your truck while you were off. That makes even more sense.

 

Ive burnt ECM's before, once on a M11 I think it was. Ran that 50 hours until I finally shut it off on a pretrip sunday, she didnt start. ECM was bad the whole time. Fortunate. Saved them a tow right there in the yard.

Shop slapped a new on in a half day, took a few thousand to hear them complain.

 

Overly suspicious isn't the word. Quite a bit of work is involved with an engine swap. You should be able to tell by just rolling the hood, no tech or company can do an engine swap without leaving a trace of this being disturbed. Not to mention volvo has a record of the engine serial number your truck left the factory with

 

Maybe they moved it around and left it idle.

 

17% idle isn’t much. I think you underestimated your idle time.I forget what my minimum was when I had the onboard computer readouts in my last Truck. Maybe someone can tell you their best % numbers.

 

Call the dealership, give them your vin, get the serials for engine, transmission, and rearends and verify.

And not even letting it idle 5 minutes ever, you'll burn your turbo up.

 

Better let it idle at least a few minutes,before shutting it off, or you will put excessive wear on turbo. It needs to cool down first.