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Help! Constant engine tone

  • Thread starter Thread starter ASAP_Taco
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ASAP_Taco said:

Source: https://youtube.com/shorts/uxedtSySBso?feature=share


This noise happens when im in accessory mode and while the engine is on. It affects my calls as the person im talking to can hear the noise on their end. Does anyone know where its coming from and how to fix? Tried unplugging the dcm fuse but no luck.
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I think you posted about it before. Did you have the dealer check it out?
How long does it usually stay on? The sound itself really sounds like the EVAP pump. Maybe there is a leak or open spot on the gas tank? Gas cap all the way on? Go for like 3-4 clicks. Sometimes it could even be a faulty gas cap. Anywhere between the tank, fuel neck and gas cap. Happens when it's trying to pressurize or purge itself.
 
The truck has two pumps you may be hearing.
1. EVAP under the hood will run when engine is on or off sometimes.
2. Gas tank has a pressure equalization pump to put air in when gas gets pulled out and pull air out of the tank if the truck is off and vapor pressure increases the pump will equalize pressure both ways.

Some people mentioned they have walked outside to the garage to hear the tank pump hours after the truck has been parked.
 
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