Ok here it goes: Truck is 2019 1500 4x4 North edition Bighorn 5.7 auto trans with stock wheels and tires 26,000 mi. A noise has started occurring on and off for about 2 months it would not do it when the truck was at the dealership in January for a rear window change and software updates. now it does it every day in all temps
Noise Description: Dying whale , fog horn, harmonic hum. noise is about the same tone and volume at any speed and while coasting
When does it occur now: 1) after driving about 2 miles ( it has never occurred immediately when truck has been sitting over night or long periods only after a few miles)
2) it starts at any speed sometimes from a dead stop and other times at any speed
When does it stop : 1) when truck gets down to about 15 mph when coming to a stop it will instantly stop and sometimes it will resume immediately when taking off and sometimes at higher speeds ( simply applying brakes does no change the tone or volume until the truck gets down to about 15 mph)
What testing i have done so far:
1) turn off radio and climate controls---------- No change
2) Remove wheels and inspect brakes--------- Everything is in good shape
3) Open windows to disable ANC--------------No change
4) Unplug ANC module-------------------------No change
5) Race engine rpms in park and neutral------No change
6) Bring truck up to speed and put into neutral coast----No change
7) Power brake----------------------------------Does not create noise
All this diagnosis leads me to believe that the noise is created in the rotating drive system from transmission to the tires with the rotors as my prime suspect .
Is there something else i should be looking for or i am missing or anyone with the same issue that has been resolved. Thanks in advance
Noise Description: Dying whale , fog horn, harmonic hum. noise is about the same tone and volume at any speed and while coasting
When does it occur now: 1) after driving about 2 miles ( it has never occurred immediately when truck has been sitting over night or long periods only after a few miles)
2) it starts at any speed sometimes from a dead stop and other times at any speed
When does it stop : 1) when truck gets down to about 15 mph when coming to a stop it will instantly stop and sometimes it will resume immediately when taking off and sometimes at higher speeds ( simply applying brakes does no change the tone or volume until the truck gets down to about 15 mph)
What testing i have done so far:
1) turn off radio and climate controls---------- No change
2) Remove wheels and inspect brakes--------- Everything is in good shape
3) Open windows to disable ANC--------------No change
4) Unplug ANC module-------------------------No change
5) Race engine rpms in park and neutral------No change
6) Bring truck up to speed and put into neutral coast----No change
7) Power brake----------------------------------Does not create noise
All this diagnosis leads me to believe that the noise is created in the rotating drive system from transmission to the tires with the rotors as my prime suspect .
Is there something else i should be looking for or i am missing or anyone with the same issue that has been resolved. Thanks in advance
