Had my dealer install the crate PCM and high octane button. When I put 100 octane in or 93 octane in, it shows up in blue light that 840 high octane activated. Why would it show that with only 93 octane?
If it doesn’t have 100 octane it should run through the checks to verify the octane and then go to 808 because the fuel isn’t 100 octane. I would probably take it in to the dealership to get checked.
