How to Jump Start a Ford C-Max Hybrid / C-Max Energi

1. Remove the red cap from the positive prong (A) on your vehicle before connecting any cables.
2. Connect the positive (+) jumper cable to the positive (+) terminal of the discharged battery.
3. Connect the other end of the positive (+) cable to the positive (+) terminal of the booster vehicle battery.
4. Connect the negative (-) cable to the negative (-) terminal of the booster vehicle battery.
5. Connect the last end of the negative (-) cable to exposed metal on the stalled engine, or to a ground point if available.
6. Start the booster vehicle and press the accelerator pedal moderately, then start the disabled vehicle.
7. Run both vehicles for an additional three minutes, then remove the cables in reverse order.

• Do not use fuel lines, engine valve covers, wiper arms, the intake manifold or hood latch as ground points.
• Check the instrument cluster for the Ready to Drive light, as the gasoline engine may not start while the electric motor runs.
• Afterward let the vehicle sit in Ready to Drive mode for several minutes to charge the 12V battery.

Source: 2018 Ford C-Max Hybrid / C-Max Energi owner's manual, PDF pages 192, 193. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.