Car juddering or shaking? Diagnose it by when it happens
Updated 23 July 2026 · OBDCode UK editorial
Can you keep driving?
Stop if the engine light flashes, a tyre has a bulge, steering shakes violently, or braking is affected. A mild repeatable vibration still needs prompt inspection because tyre and brake faults can worsen quickly.
Match what the car is doing
| What you notice | Most likely | How to separate it |
|---|---|---|
| Judder pulling away | Clutch contamination/wear or engine mount | Compare clutch bite with engine running quality and stored misfire codes. |
| Shake under braking | Disc run-out, pad deposit or sticking caliper | Does it pulse through pedal, steering wheel or whole car? Inspect temperatures and run-out. |
| Rough only at idle | Misfire, air leak or engine mount | P030x/fuel trims separate combustion from a mechanical mount. |
| Vibration at 60–70 mph | Wheel balance, tyre damage or buckled wheel | Front faults often reach steering wheel; rears often reach seat, but inspect all four. |
Checks to do before buying parts
- Write down speed, gear, throttle, braking and engine temperature when it occurs.
- Inspect tyres for bulges, cords, uneven wear and lost balance weights.
- Scan for pending misfire codes even if the lamp is off.
- Check prior brake, tyre and suspension notes in the MOT history.
Typical UK costs
| Likely job | Typical fitted price |
|---|---|
| Wheel balance | £10–£20 per wheel |
| Coil/plugs for misfire | £55–£350 |
| Pads and discs per axle | £180–£400 |
| Engine mount | £90–£350 |
| Clutch/DMF | £450–£1,600 |
Indicative 2026 independent-garage prices for mainstream cars; London, prestige, SUV and seized-part jobs can cost more. Diagnose first.
MOT relevance
The symptom itself is not scored, but its cause may be: damaged tyres, excessive suspension play, brake imbalance, warning lamps and emissions faults are all relevant.
- Topdon OBD2 scannersTopdon diagnostic scanners with full-system readouts
- XTOOL diagnostic toolsXTOOL code readers for petrol and diesel cars
- Autel UK testersAutel professional-grade diagnostic testers
Frequently asked questions
Why does my car shake at 70 mph but not 50?
Wheel/tyre imbalance often resonates in a particular speed band. Inspect tyres first, then balance and wheel condition.
Can a misfire feel like clutch judder?
Yes under acceleration. A cylinder code, flashing lamp or uneven idle points to combustion rather than the clutch.
Sources and further reading
General guidance for UK drivers, not professional advice. MOT rules follow the DVSA inspection manual (2026 edition).