car shakes when driving

Most Likely Causes

1. 1

   Worn or Warped Brake Rotors

   When brake rotors become warped or unevenly worn, they cause vibration when braking—and sometimes even when driving if the rotor is severely damaged. Car shakes when driving may indicate the rotor is pulsing against the caliper. This is one of the most common causes and requires immediate attention for safety.

   More common in older vehicles or those with high mileage in wet climates.

2. 2

   Unbalanced or Damaged Tires

   Tires that are out of balance or have uneven wear create a rhythmic vibration, especially at highway speeds. A flat spot, bulge, or feathering on the tire surface will cause noticeable shaking when driving. Wheel weight distribution issues can also contribute.

   Check tires after hitting a pothole or curb hard.

3. 3

   Worn Suspension Components

   Damaged struts, shocks, control arm bushings, or worn ball joints allow the suspension to move excessively, creating shaking throughout the vehicle. The shaking often gets worse over bumps or when turning. This requires professional inspection and replacement.

   Common in high-mileage vehicles (80,000+ miles).

4. 4

   Engine Misfire or Ignition Issues

   A misfiring engine (caused by bad spark plugs, ignition coils, or fuel injector problems) creates vibration felt throughout the car, especially at idle and low speeds. Car shakes when driving at low RPM and may improve at higher speeds. Check the check engine light for cylinder misfire codes.

5. 5

   Worn or Damaged CV Joints (Front-Wheel Drive)

   A torn CV axle boot or failing CV joint creates clicking and shaking, especially when accelerating or turning. The vibration is usually felt in the front of the car and may worsen with sharp turns. This typically requires axle replacement.

   Specific to front-wheel drive and all-wheel drive vehicles.

6. 6

   Wheel Hub or Bearing Problems

   A failing wheel bearing creates a grinding noise and vibration that may feel like the car shakes when driving at certain speeds. The vibration often increases when turning toward the bad bearing. This requires prompt repair to avoid wheel lockup or separation.

How to Diagnose It

1. 1

   Visual Tire Inspection

   Park on level ground and inspect all four tires for bulges, flat spots, uneven wear patterns, or debris. Feel the tire surface for lumps or damage. Look for any visible signs of damage that would explain why the car shakes when driving.

2. 2

   Brake Rotor Feel Test

   After a short drive, carefully feel the outside of each wheel with your hand (be careful—rotors are hot). A warped rotor may feel uneven or have a noticeable high spot. If you feel significant roughness or variations, the rotor likely needs replacement.

3. 3

   Suspension Component Check

   Park on level ground and push down hard on each corner of the vehicle bumper. The car should bounce once and settle; if it bounces multiple times or feels mushy, suspension components are worn. Have a helper watch for clunking noises from the suspension.

4. 4

   Check Engine Light Diagnostic Scan

   Use an OBD2 scanner to read trouble codes from the engine computer. Codes related to cylinder misfire (P0300–P0308) indicate ignition or fuel delivery problems. This test pinpoints engine-related causes of vibration.

   Tool: OBD2 scanner

5. 5

   Test Drive Analysis

   Drive at different speeds (20 mph, 40 mph, 60 mph) and note when shaking occurs. At a stop, accelerate gently and listen for misfires or clunking. Test braking to see if shaking increases during deceleration. Document when the shaking is worst to help identify the cause.

How to Fix It

• Replace Brake Rotors and Pads

  If rotors are warped or damaged, they must be replaced—resurfacing is not a reliable permanent fix for severe warping. Brake pads should always be replaced at the same time to ensure even braking. This is a critical safety repair that restores smooth braking and eliminates vibration.

• Rebalance or Replace Tires

  A tire shop can rebalance all four wheels to eliminate vibration caused by weight distribution. If tires are damaged or worn unevenly, they must be replaced. Proper wheel alignment should also be checked to prevent uneven wear in the future.

• Replace Worn Suspension Parts

  Shop recommended

  Struts, shocks, control arm bushings, and ball joints that are worn must be replaced by a mechanic. These components wear over time and cannot be repaired—replacement is the only solution. After replacement, a wheel alignment is recommended to ensure proper handling.

• Replace Spark Plugs and Ignition Coils

  If engine misfire is diagnosed, replace worn spark plugs and any faulty ignition coils. Follow your vehicle's maintenance schedule for spark plug replacement intervals. This simple fix often eliminates vibration caused by misfiring cylinders.