Short answer
Reduced engine power, often called limp mode, means the engine computer has detected a fault and limited power to protect the engine or transmission. The car will feel sluggish and may hold one gear. Drive slowly to a nearby shop or safe place, avoid highways, and have the stored fault codes read.
- Also shown as:
- Limp mode · Limp home mode · “Reduced engine power” message · Ford amber wrench light (powertrain fault)
- What it looks like:
- Usually a text message; some cars show an engine outline with a downward arrow, and Ford uses an amber wrench.
Is it safe to keep driving?
Slowly, and only to a nearby shop. The car will feel very sluggish and may be held to low speeds. Avoid highways.
Stop driving now if:
- The temperature or oil pressure warning is also on.
- The check engine light is flashing.
- The car loses power so badly that you cannot keep up with traffic — get off the road rather than press on.
What causes the reduced engine power / limp mode?
Most common first. Symbols and meanings vary by manufacturer; your owner's manual has the definitive meaning for your model.
- Throttle body or accelerator pedal sensor fault. Modern throttles are electronic. If the sensors on the pedal or the throttle disagree, or the throttle body is dirty or failing, the computer limits power to stay safe.
- Turbo boost fault. On turbocharged engines, too much or too little boost — a stuck wastegate, a split hose or a sensor fault — triggers limp mode to protect the engine.
- Transmission fault. Many automatics hold a single gear when they detect a problem, so the car pulls away slowly and revs high at speed.
- Overheating. Some engines cut power when they run too hot. Check the temperature gauge before anything else.
- Wiring or low voltage. A corroded connector or a weak battery can make sensors read nonsense, which the computer answers with reduced power.
What should you do right now?
- Turn on your hazard lights if you cannot keep up with traffic and move to a slower lane or off the road.
- Check the temperature and oil warnings. If either is on, stop.
- Pull over, switch off for a minute and restart — it sometimes clears a transient fault.
- If it returns, drive slowly to the nearest shop, avoiding highways.
- Have the codes read; limp mode almost always stores one.
What does the fix usually involve?
The stored codes point to the system that triggered it. Common repairs: cleaning or replacing the throttle body, a pedal sensor, a turbo hose or actuator, a wiring repair, or a transmission fluid service or solenoid.
Some limp-mode faults are fixed by a software update from the manufacturer, and some are covered by recalls or extended warranties — check your VIN.
How much does it cost to fix?
$100 – $2,500
A throttle body clean at the low end; a turbo or transmission repair at the high end.
A typical range, not a quote. Actual cost depends on the car, the shop and the fault.
Common questions
Can I drive on the highway in limp mode?
Not safely. Power is limited and the car may not accelerate enough to merge or keep up with traffic. Use slower roads to reach a shop, or have it towed.
Will limp mode go away on its own?
Sometimes it clears after a restart if the fault was momentary, but the code stays stored and the fault usually returns. Have it read even if the car seems normal again.
Is reduced engine power the same as the check engine light?
They often come together, but they are different. The check engine light reports a fault; reduced power is what the computer does about some faults. Either way, the code reader is the next step.
Check your car
Free VIN check: open NHTSA recalls, owner complaints and the safety rating for your exact car.