Hum/Rumble Noise in high gears - Any Help??

[patmulligan99]

I just purchased a 24 Powerboost. It has less than 100 miles on it and I have the same intermittent noise. I have only driven the truck twice.

has to be some component loose like a stupid heat shield or something no way that all these ppl are having this issue especially new I can see my case after some miles but brand new?

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[Fastksguy]

has to be some component loose like a stupid heat shield or something no way that all these ppl are having this issue especially new I can see my case after some miles but brand new?

No it is clearly the engagement and disengagement of a component.

 

[patmulligan99]

No it is clearly the engagement and disengagement of a component.

ok which component

 

[Fastksguy]

ok which component

I will take it apart and inspect each component then let you know.

 

[Gros Ventre]

That kind of gear noise is most likely an alignment issue. Look closely about how the rear axle is set up.

 

[patmulligan99]

I will take it apart and inspect each component then let you know.

idk some dude above said he had a trans flush and it went away. How would that make sense for a brand new like yours

 

[patmulligan99]

That kind of gear noise is most likely an alignment issue. Look closely about how the rear axle is set up.

I only get it in highway speeds never off highway. And only into inclines

 

[Gros Ventre]

I only get it in highway speeds never off highway. And only into inclines

At highway speeds you are where you'd have the least background noise. That would bring out the steady, rumbling kind of noise. The comment about the transmission as the source... Well possible but then it would change with gear shifts and yours appears to not be changing except for loading. The points to an axle. Is your rear axle electronic locking? if it is dies the noise change when you lock in the axle? In the case of the front axle as the source, does it change 2WD to 4WD to 4WD low? Do you have full time 4WD?

 

[patmulligan99]

My new 2024 powerboost is doing the same thing.

damn

 

[patmulligan99]

At highway speeds you are where you'd have the least background noise. That would bring out the steady, rumbling kind of noise. The comment about the transmission as the source... Well possible but then it would change with gear shifts and yours appears to not be changing except for loading. The points to an axle. Is your rear axle electronic locking? if it is dies the noise change when you lock in the axle? In the case of the front axle as the source, does it change 2WD to 4WD to 4WD low? Do you have full time 4WD?

so I do not think I have full time 4H. I have engaged 4H and can see the power distribution to the front wheels but when it is off it is only back wheels and the driving is smoother. I would hope it’s not stuck in 4H becuase this occurs at highway speeds. My trim doesn’t have 4A, only 4H and L. The noise only occurs when it stays in gear, if I add extra throttle and it downshifts then it doesn’t occur, so it’s high gear low load, revs are at like 1500.

it’s boggling to me how OP says a trans flush fixed his issue but some other commenters say theirs is doing this off the lot brand new

 

[Fastksguy]

I just took it for a drive and ruled out many possibilities. It is definitely load related, at 75 and a slight incline seems to be the only time you can feel or here it. I ruled out the cruise and lane assist. What was interesting is the rhythm would start and stop even though the load did not change so immediately I was thinking hybrid system. The rhythm did not change speed even with different gears at the same mph so it is not the engine. I changed the vehicle speed to 65 but the speed of the rhythm did not change only not quiet as load. One thing I did not do is vary the state of charge to see if it would change the operation of the noise. It is a very defined noise the frequency is unlike a typical driveline vibration. This noise will be the result of the operation hybrid system/generator.

 

[patmulligan99]

I just took it for a drive and ruled out many possibilities. It is definitely load related, at 75 and a slight incline seems to be the only time you can feel or here it. I ruled out the cruise and lane assist. What was interesting is the rhythm would start and stop even though the load did not change so immediately I was thinking hybrid system. The rhythm did not change speed even with different gears at the same mph so it is not the engine. I changed the vehicle speed to 65 but the speed of the rhythm did not change only not quiet as load. One thing I did not do is vary the state of charge to see if it would change the operation of the noise. It is a very defined noise the frequency is unlike a typical driveline vibration. This noise will be the result of the operation hybrid system/generator.

so I was yelled at on Reddit for not understanding the hybrid tech. This dude who has since deleted all his comments claimed that under these conditions the hybrid system engages to assist in giving extra power instead of downshifting. That action thus causes noise.

I am not an engineer but I can see that especially since this is happening in new vehicles. but what I don’t understand is how EVERYONE doesn’t have that, and how some claim this didn’t always do it, it started after X miles or whatever. That baffles me.

 

[patmulligan99]

I just took it for a drive and ruled out many possibilities. It is definitely load related, at 75 and a slight incline seems to be the only time you can feel or here it. I ruled out the cruise and lane assist. What was interesting is the rhythm would start and stop even though the load did not change so immediately I was thinking hybrid system. The rhythm did not change speed even with different gears at the same mph so it is not the engine. I changed the vehicle speed to 65 but the speed of the rhythm did not change only not quiet as load. One thing I did not do is vary the state of charge to see if it would change the operation of the noise. It is a very defined noise the frequency is unlike a typical driveline vibration. This noise will be the result of the operation hybrid system/generator.

it’s interesting you mention state of charge tho, because a lot of feedback on forums talk about since the cold weather has come etc. I’ve only had the truck in cold weather so I’ve been warming it up with auto climate using heated seats etc…. So I wonder if the increased demand effects it

 

[Fastksguy]

it’s interesting you mention state of charge tho, because a lot of feedback on forums talk about since the cold weather has come etc. I’ve only had the truck in cold weather so I’ve been warming it up with auto climate using heated seats etc…. So I wonder if the increased demand effects it

Either way it should not make that noise. If it is by design it is a poor design.

 

[Gros Ventre]

so I was yelled at on Reddit for not understanding the hybrid tech. This dude who has since deleted all his comments claimed that under these conditions the hybrid system engages to assist in giving extra power instead of downshifting. That action thus causes noise.

I am not an engineer but I can see that especially since this is happening in new vehicles. but what I don’t understand is how EVERYONE doesn’t have that, and how some claim this didn’t always do it, it started after X miles or whatever. That baffles me.

Well, the hybrid mode is driven by a motor on the front end of the transmission. There is an over-running clutch between the engine and the hybrid motor. So it is always turning whether powering/generating or not. I would not think it involved. A rumble is normally gear related. U-Joints can give a load related noise, but I wouldn't label it rumbling, more like a snapping-popping.

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