Ram 1500 CHECK FUEL CAP | Fix P0456 / P0457 | ESIM Replacement

Ram 1500 CHECK FUEL CAP warning won’t go away? Codes P0456 or P0457 even after tightening or replacing the gas cap? This video shows the most likely cause — a failed ESIM (Evaporative System Integrity Monitor) — and how to fix it for about $25. If your gas cap is good and the warning won't go away, this is one of the most common causes on Ram trucks. This video covers: • What the ESIM is • Where to find it on the truck • How to remove and replace it • How to tell if the ESIM is bad • Clearing codes and what to expect after the repair ⚠ Important: Even after replacing the ESIM and clearing codes, it may take several drive cycles for the warning message to fully go away. This is normal. This fix applies to many Ram 1500 trucks that show: • “Check Fuel Cap” message • P0456 – EVAP System Small Leak • P0457 – EVAP System Leak Detected I used this Dorman Replacement part: 👉 https://amzn.to/4aMyj99 (As an Amazon Associate I may earn a small commission from qualifying purchases. Thanks for supporting GearheadWoodshop!) I don’t just fix my truck — I also build fun projects and shop builds. Check out more videos on the channel if you’re into DIY projects. #Ram1500 #CheckFuelCap #P0456 #P0457 #EVAP #ESIM #RamTruck