Symptoms
- Vibration or shaking felt mainly when accelerating, less so coasting
- May be accompanied by a clicking sound when turning (CV joint)
- Vibration changes with vehicle speed
- Felt through the seat, floor, or steering wheel
Likely causes
- CommonWorn CV joints (front-wheel drive)Worn joints often click when turning and vibrate under acceleration as play increases.
- CommonWorn or unbalanced driveshaft (rear-wheel or 4WD/AWD)A driveshaft that's out of balance or has worn U-joints vibrates more noticeably under load.
- PossibleWorn engine or transmission mountA bad mount lets the drivetrain shift position under torque, which can feel like vibration.
- PossibleTire or wheel imbalance (often mistaken for drivetrain)An imbalance that's more noticeable under acceleration can mimic a drivetrain vibration.
- Less commonTorque converter issue (automatic)Some torque converter problems present specifically as an acceleration-related vibration.
What to do
- Note whether the vibration happens only when accelerating, only at certain speeds, or also while coasting.
- Listen for a clicking sound when turning at low speed, which points strongly to a CV joint.
- Check engine and transmission mounts for visible wear or excess movement.
- Rule out tires by checking for uneven wear or having them checked for balance if the vibration is speed-related rather than load-related.
- Avoid continued hard acceleration until the source is identified, since a failing CV joint or driveshaft can eventually fail completely.
- Have a shop put the vehicle on a lift to inspect CV joints, the driveshaft, and mounts.
- Get the confirmed worn component replaced, since these don't improve on their own.
Tools and parts
CV axle or jointSearch: “CV axle for [make model year]”
When to call a pro
See a mechanic for a lift inspection, since CV joints, driveshaft balance, and mounts all need a hands-on look to tell apart.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.