Your descriptions could be MANY things.
Can you possibly create a video, upload to YouTube and provide a link here? That may help us understand what the issue is.
Is it a shake, a wobble, a grind, a noise, or other? There are many things to think about.
How about giving us more info like...
When the VC fails, it typically fails in the "locked" configuration, so the thought here is it may be acting like the CDL is locked, when in fact the VC has failed.