Is it safe to?Reviewed: 2025-12-26~1 min
Is it safe to run a car in a closed garage?
Short answer
ℹ️Quick answer
No—running a car in a closed garage can quickly lead to deadly carbon monoxide buildup.
Why people ask this
People may start a car briefly for warmth or maintenance without realizing the danger.
When it might be safe
There are no commonly accepted situations where this is considered safe.
When it is not safe
- Running the engine in a closed or poorly ventilated garage
- Assuming modern cars are safe indoors
Possible risks
- Carbon monoxide poisoning
- Loss of consciousness
- Death
Safer alternatives
- Open the garage door fully
- Move the car outside before running
- Avoid idling indoors
Bottom line
Never run a car in a closed garage, even for a short time.
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