I am glad to hear that as I have the same code. Luckily my boat doesn't weigh 3000#. My pump seems to keep running. Anyone have that? It is that high pitched noise all the time. I thought that the air pump was supposed to shut off after a few minutes.Trailblazer towed better than expected, it took on jelico mountain on i-75 really well towing a 3000# boat and 1200#of gear and people. I got 13 miles a gallon with a/c on in ohio and northern kentucky, and about 10 miles a gallon in southern kentucky, and tennessee, happy so far, boat trip was graet, now to work on that code.
Have you pulled the fuse to disable the pump? Running a 30 Amp turbine all the time is going to kill it in short order. It should only run for 30 seconds on a cold start.
Please confirm it's the air pump under the driver's seat mounted to the frame - it might be the $20 serpentine belt idler pulley if it's just a whine.