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The system is not that smart. It just checks when you first start the truck and then again every 15 minutes. The leak is probably just a leak. Either a wheel o-ring, a nail in the tire (could happen), or a leak in the CTIS valve assembly somewhere. break out the soapy water and find it. It's...

This is where they add a core to disable the CTIS. The whip of the CTIS valve threads over it and it appears to be connected properly. However, when your brain says "check pressure", you'll get an instant 5 flashing lights.

I would suspect that you don't have a leak. If you have a leak, the system tries to fill until it figures out it can't reach pressure. What you have is more likely "not being able to check pressure". The most common cause of this is that a valve core has been added between the CTIS valve's...

It's been my experience (<---this means I'm not an expert by any means) that 5 lights flashing means the system either cannot check pressure, or cannot achieve pressure. A: Can't check pressure often means there's a schrader valve where it shouldn't be. B: Can't get to pressure often means...