Ford C-Max Hybrid / C-Max Energi Warning Lights: What They Mean

Other warnings and indicators

Stability and traction control light

Lights briefly at start-up and flashes when either system activates. Steady illumination means a problem or failure in either system.
What to do: Check traction control wasn't manually switched off; if still steady, have an authorized dealer service it immediately. PDF page 159

Low tire pressure telltale

One or more tires are significantly under-inflated. If it flashes about one minute then stays lit, the TPMS has a malfunction.
What to do: Stop and check tires as soon as possible and inflate to the proper pressure. Check the telltale after replacing tires or wheels. PDF page 268

Service engine soon indicator

The OBD-II system has detected an emission-control malfunction, which may be temporary, such as running out of fuel, poor fuel, or a loose fuel inlet.
What to do: If it stays on after three driving cycles, have the vehicle serviced at the first available opportunity. PDF page 148

Seatbelt warning lamp

Lights with a chime when the driver seatbelt is not fastened as the ignition is turned on.
What to do: Buckle the driver seatbelt; the lamp and chime turn off. PDF page 36

Stability and traction control off light

Lights briefly at engine start-up and stays on when the traction control system is switched off. PDF page 159

Passenger airbag status indicator

Stays lit to show the front passenger frontal airbag is disabled, such as when the seat is empty or a child seat is detected.
What to do: If an adult is seated and it stays lit, restart with the person upright for two minutes; otherwise have them ride in the rear. PDF page 44

Summarized in our own words from the 2018 Ford C-Max Hybrid / C-Max Energi owner's manual (AI-assisted; every light name was matched against its cited page 2026-10-18). Your vehicle may not have every light, and other years can differ. A red warning that stays on usually means stop safely and check: your manual has the final word.