bshowalter
Member
Took my 2019 Limited Max in for service due to a front end howling noise. Assumed a front wheel bearing was failing. Just got word from the dealer it is the front differential outer pinion bearing that is failed. Truck has 40k miles and it will be covered under the 60k powertrain warranty.
Here is my question. The noise occurred in any drive mode, even 2H. Why is the front diff turning in 2H? While trying to diagnose, I lifted both front wheels off the ground and spun them. Both front axles turned. I read that the IWE actuators work off a vacuum so the engine has to be running to release them. So I tried starting the truck and the front axles still turned with the wheels. Then I read somewhere that you had to drive a few miles before they would release. Wasn't able to test that. But now with this noise in the front diff always present it makes me think the front drivetrain is always turning. Is that true?
I've read a bunch of the threads on here about drive modes and wasn't able to ever get a clear answer.
Here is my question. The noise occurred in any drive mode, even 2H. Why is the front diff turning in 2H? While trying to diagnose, I lifted both front wheels off the ground and spun them. Both front axles turned. I read that the IWE actuators work off a vacuum so the engine has to be running to release them. So I tried starting the truck and the front axles still turned with the wheels. Then I read somewhere that you had to drive a few miles before they would release. Wasn't able to test that. But now with this noise in the front diff always present it makes me think the front drivetrain is always turning. Is that true?
I've read a bunch of the threads on here about drive modes and wasn't able to ever get a clear answer.
