Constant Velocity Joint or CV allows a driveshaft to transmit power through an irregular angle during rotational speed without increased friction or play.
- Unusual noise in the driveline of a front-drive vehicle usually indicates a damaged or worn CV joint. Other conditions in the transaxle, bearings, and tires also create noise.
- A clicking noise while turning indicates a worn or damaged outer CV joint. A clunk when accelerating or decelerating indicated a worn or damaged inner CV joint. Shudder or vibration during acceleration is also probably caused by a defective inner joint. Other possible causes include a bad intermediate shaft bearing, outer joint, engine mount, or torque strut. Causes of vibration at highway speed include outbalance tiers, out of round tires or wheels, or an alignment problem
- Vibration or growl may also be caused by a bad wheel bearing. To check the wheel bearing, raise the wheel with a jack. Place a safety stand under the lower control arm, then spin the wheel by hand while listening at the hub for bearing inspection
The CV-joint boots deteriorate and may crack or tear during normal use. The boots and outer CV joints fail more frequently than the inner boots and joints. This is because the front wheels move through greater angles for steering. Some vehicle manufacturers recommend inspecting the boots every time the engine oil is changed.