If a CO alarm sounds: Move every person and pet into fresh air immediately and call emergency help if symptoms or a continuing alarm are present. Do not stay inside to troubleshoot.

Portable generators are the highest-risk setup

Never run a portable generator inside the RV, under the RV, in a garage, in a storage bay, under an awning enclosure or near windows and vents. Place it outside with exhaust directed away from RV openings and neighboring campsites.

Built-in generators still need inspection

A factory-installed generator is designed with an exhaust path, but damage, missing hangers, rust, improper extensions or body repairs can let exhaust enter the RV. Inspect visible exhaust before use and stop for unusual smell, sound, soot or vibration.

CO alarms are not optional

Use listed CO alarms within their service life. Test them, replace them by the date on the alarm and make sure sleeping occupants can hear them. A working alarm is backup protection, not permission to run a bad exhaust setup.

Know the symptoms

Headache, dizziness, weakness, nausea, vomiting, sleepiness and confusion can be carbon-monoxide symptoms. Treat them seriously, especially if more than one person or pet seems affected.

Related generator pages

Sources and review notes

The U.S. Consumer Product Safety Commission warns that portable generators produce dangerous carbon monoxide and advises outdoor-only placement away from openings. See the CPSC carbon monoxide information center. Always follow the generator and RV manufacturer instructions.