Limp mode
Car suddenly loses power and limits revs. Use codes + symptoms to find the trigger quickly.
MED RISK
Common symptoms
- Reduced power / limited revs
- Warning lights on dash
- Turbo boost limited
- May reset after restart
Cost expectations
DIY: £0–£60. Garage: £80–£250+.
Note: prices vary by car and region. Use this as a planning range.
Most likely causes (ranked)
- Boost/air fault — Underboost/overboost triggers protection.
- Sensor fault — MAF/MAP/DPF sensors give implausible readings.
- EGR/DPF — Soot load or EGR sticking.
- Transmission fault — Some cars limit torque for gearbox protection.
- Overheating — Temp issues trigger protection mode.
Quick checks (fast, low-cost)
- Scan for stored codes even if light is off.
- Check if it happens under load, heat, or after regen.
- Inspect boost pipes for splits and loose clamps.
- Check coolant level and temps if overheating suspected.
- Clear codes only after noting them and fixing root cause.
Recommended tools
These tools make diagnosis faster and stop you buying random parts.
Related fixes
If your symptoms don’t match perfectly, check these next.
What to do next
- Use codes to guide you — limp mode is a symptom, not a diagnosis.
- Fix air/boost problems first if present.
- If repeated, avoid hard driving until resolved.
AutoSolveHub helps you narrow possibilities. Always confirm critical repairs with proper testing and safe procedures.