My husband has a 2014 Dodge Charger RT all wheel drive. We have been hearing this strange grinding noise from the front end. It only happens when you let off the gas. It is not there while accelerating. Two different Dodge dealerships can’t figure it out. Any help is greatly appreciated.
That sort of sounds like a drive shaft, CV joint, or trans-axle problem to me. Try experimenting to see if there’s any brake involvement maybe. Drive it at a steady speed for example, then let off the gas and take note of the noise. Then drive it at that same steady speed while applying the brakes a little, then let off the gas while still applying the brakes. Any difference in the sound or how the car responds?
Next time your shop gets it on a lift, make sure they check for any unusual play in the drive line components, the CV boots are ok, and that there’s the proper amount of fluid in the trans axle/differential. Nothing? Sometimes a failing wheel bearing might cause this, so ask the shop to check for that. Still nothing? hmm … when you let off the gas it changes the suspension components configuration a little, so there’s a chance something is rubbing on the wheels due to the front end lowering as a result of the deceleration. Ask the shop to look at the inside of the wheels for any unusual rubbing marks.
Is it still under factory warranty? If not, do you have documentation the 2 dealerships could not diagnose the problem while under factory warranty?. If you do it is Dodge’s problem until properly repaired.
Check brake backing plates
I agree with sgtrock21. The dealerships may not want to find what’s wrong with your car until the warranty is over. Make sure you document that the problem thoroughly to hold Dodge accountable.
That is a misconception, dealer employees are aware that a complaint can’t be dismissed when the warranty expires.
How many miles are on the car and what is the duration of the warranty?
I’ll post this just in case @je_allen checks back here.
I’d have the dealer technicians check engine/transmission mounts carefully and look for any evidence of alignment problems or defects involving mounts.
I experienced a problem like this once that was difficult to locate. It turned out to be what I have described.
While accelerating, engine torque moved the engine/transmission just enough to make the noise cease.
However, while decelerating, lack of much torque allowed the engine/transmission to transfer noise and vibration through metal-to-metal contact of the mounting parts, to the car’s body.