Hi,
The gas cap is tied into the evaporative emissions system and isn't part of the circuits having the issue.
The tests I listed above are what I feel need to be done. The only other thing I can suggest is to try scanning the can-bus.
CAN stands for controller area network. Basically, the different modules are tied together via a few wires. This type of scan will retrieve codes regardless of the module storing them. It does require a scanner that can perform this, but they aren't uncommon.
Here is a link showing how it's done:
https://www.2carpros.com/articles/can-scan-controller-area-network-easy
I guess what I'm saying is there could be something other that could help us narrow it down without the diagnostics above.
Let me know your thoughts.
Take care,
Joe
Tuesday, June 27th, 2023 AT 7:10 PM