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Discussion Starter #1
The other day my wife called me from the truck saying it was making a strange noise, almost like when you're light on the brake at a stop and letting it creep and the brakes chatter a bit.

I was frustrated because that didn't make much sense to me. I thought maybe it was the exhaust system flexing and making some noise - it did that during a regen while her and I were driving since then and she said no, that wasn't it.

Today it did it while I was driving in a parking lot. First in a parking lot, it was a popping noise that almost seemed like a wheel bearing or steering/suspension component going bad and popping while driving through a tight turn.

Then once we parked it did it again. And again while driving later about 35 mph. It started sounding to me almost like it was coming from the exhaust... Like an overrun crackle that you could feel through the seat, steering wheel, floor boards... Fairly significant.

Anyone ever experienced anything like this or have any ideas about what it could be?
 

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Does it (sound or vibration) increase with rpm’s?

Also does it happen while turning only or driving straight or even sitting still?
 

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Discussion Starter #3
Does it (sound or vibration) increase with rpm’s?

Also does it happen while turning only or driving straight or even sitting still?
It's not steady enough to tell whether it correlates with RPM or speed. It's happened both while moving and while stopped.

I'm thinking it's more steering/suspension related because I can't imagine anything could be going on with the engine that wouldn't throw some emissions related codes... but I'm not sure how that would happen while standing still...
 

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Turbo issues (bent fins for example) won’t throw any codes. That usually increases in sound as rpms increase.
 

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@18Z71Minimax : Its hard to diagnose with a noise description, so please disregard if you feel this is moot. I had an issue with my transfer case engaging 4 Lo randomly due to wire chafing. It was very apparent when making tight turns at low speeds and the hubs usually would not engage. Have you watched your transmission temps while having an episode and noticed any fluctuations? You can isolate if it is a transfer case issue, by disconnecting the negative terminal for a few minutes, reconnect, start the truck, and immediately pulling your transfer case fuse (located under the hood). I will say that it is unlikely, if you have not gotten the Service 4WD message on your display, but weird things happen with electrical shorts. Sorry I couldn't be of more help, let us know when you get it pegged.
 

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Discussion Starter #7
@18Z71Minimax : Its hard to diagnose with a noise description, so please disregard if you feel this is moot. I had an issue with my transfer case engaging 4 Lo randomly due to wire chafing. It was very apparent when making tight turns at low speeds and the hubs usually would not engage. Have you watched your transmission temps while having an episode and noticed any fluctuations? You can isolate if it is a transfer case issue, by disconnecting the negative terminal for a few minutes, reconnect, start the truck, and immediately pulling your transfer case fuse (located under the hood). I will say that it is unlikely, if you have not gotten the Service 4WD message on your display, but weird things happen with electrical shorts. Sorry I couldn't be of more help, let us know when you get it pegged.
I actually said at one point, it almost sounds like a Detroit Locker popping while turning... But my wife heard it mostly with the truck stopped, so I wouldn't think it's anything like that. It's making me want to go back to driving the truck for a couple weeks instead of my company car to try to experience it more and diagnose it.
 
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