Have a 2018 Ram 2500 6.4L Laramie for about a year- has 20,000 miles on it. Around 15,000 miles (seemed like right after an oil change) it developed an issue in that intermittently it seems to have a lot of distortion (like a blown speaker sound or bass turned up way too high on a cheap stereo) that sounds like it is coming out of the speakers but there also seems to be a rumbling when the radio is muted. Doesn't seem to be speed related and if I turn the base on the EQ down to 0 it is still there. I have searched the forums and can't seem to find any posts of a similar issue and how to diagnose. Truck is bone stock except replacement tires and issue did not appear around the time the tires were mounted. Can anyone help?
TIA
TIA