CHECK ENGINE LIGHT
A check-engine light tells you the vehicle computer has detected a fault, but the way the light behaves can change how urgently you should respond. A scan code is a starting clue—not a complete diagnosis by itself.
A solid check-engine light
A steady light generally means a fault has been stored. The vehicle may appear to drive normally or it may have noticeable symptoms. Schedule diagnosis rather than ignoring it, especially if fuel economy, power, idle quality or starting has changed.
A flashing check-engine light
A flashing light can indicate a more severe active fault such as a misfire that may damage emissions components. Reduce driving and seek prompt professional guidance. If the vehicle is running very poorly, shaking severely, overheating or showing other serious symptoms, do not keep driving simply to reach a shop.
Why reading the code is not the same as diagnosing the problem
A diagnostic trouble code identifies the system or condition that the computer detected. It does not always identify the failed part. Testing can involve live data, electrical checks, vacuum/leak testing, ignition/fuel checks or other system-specific steps.
Useful information to tell the technician
Patterns help diagnosis. Note when the light came on and whether the problem changes with speed, temperature or load.
- Whether the light is solid or flashing
- Any rough running, hesitation or loss of power
- Recent fuel fill-up or repair work
- Whether the vehicle is hard to start
- Other warning lights that appeared at the same time
Can the light reset itself?
Some faults can turn the light off after the condition no longer occurs, but the history may remain stored. If the symptom returns or the underlying cause is not corrected, the light can return as well.
Related services & guides
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