What is a CV axle? A CV axle transfers power from the engine to the front wheels on vehicles with front-wheel drive. Axles with CV joints do require maintenance sometimes. Debris and dirt can get on the CV axle and damage it, but if you can catch it early, you can salvage the cv joint. In this video, Bruce Bonebrake tells you what symptoms indicate problems with the cv axle and cv joint and how to diagnose the problem.