I have a 2022 Silverado, 3.0-liter diesel, and the check engine light came on. I took it to the Chevy dealership who could not look at it (that's a whole other story). The code is U1962. Oddly enough Advance Auto Parts was the first people to work on my brand new Chevy. The CEL comes on, then goes off, then comes back on. Any idea what this might be?