tbarn

Dealer trades happen all the time. The problem is that if someone (you) show interest in a truck, the dealer is unlikely to trade it.

Check your wiring. P0449 is strictly a vent valve code

Can you no longer just disconnect the shift cable at the transmission and manually shift to neutral?

1. Don't throw a camera or HMI module at it. 2. Bad grounds do not blow fuses. 3. Is the engine running and in R when you are checking the fuse? 4. With engine running and in R you should have B+ at fuse F7DL in the left IP fuse box and at F33UA in the under hood fuse block. 5. The back up lamps have nothing to do with the HMI but the back up lamps and camera get power from the same fuses. The camera has an additional power feed. Start with that.

GM had a hard time getting certain oil filters some time ago. Dealers had to use what they could get.

Sounds like it's time for a battery to me.

The SIR module requires a set up routine after sps programming. Was it done?

The relay is a PCB relay (electronic). Not serviceable. New fuse block wound be required.

Pretty sure it does not have one.

Neither of those codes exist for a 2013 silverado.

Under truck above driveshaft. No programming required.

I believe this will be your low side port. Not 100% sure though.

You need to lift the tab then slide it off.

Flowmaster on my truck 5 years and going strong.