SRT Hellcat Forum banner
  • Hey Everyone! Vote for the Site Favourite HOTM winner for the year of 2022 HERE!

840 or 808

2351 Views 7 Replies 6 Participants Last post by  2048 Demon
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?
1 - 2 of 8 Posts
Have you ran all of the 100 octane out? It could still be reading the mixture as being 100 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.
1 - 2 of 8 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.