How to Jump Start a Volvo XC90 Twin Engine

1. Put the ignition in mode 0 and check that the auxiliary battery is 12 volts.
2. If the auxiliary battery is in another vehicle, switch that engine off and keep the vehicles from touching.
3. Clamp the red cable to the auxiliary battery's positive (+) terminal, then fold back the cover and clamp its other end to your vehicle's positive (+) jump start terminal.
4. Clamp the black cable to the auxiliary battery's negative (-) terminal, then the other end to your vehicle's negative (-) ground point.
5. Check the clamps are secure, then run the assisting vehicle's engine at about 1500 rpm for a few minutes.
6. Start your vehicle's engine; if it does not start, wait an additional 10 minutes of charging and try again.
7. Remove the cables in reverse order, black first and then red, without letting black clamps touch positive terminals or red clamps.

• The vehicle cannot be started if the hybrid battery is discharged.
• Do not touch the cable connections during the start attempt because of sparking risk.
• Do not use the battery terminals in the luggage/cargo area; use the engine compartment connection points.

Source: 2018 Volvo XC90 Twin Engine owner's manual, PDF pages 472, 473, 617. 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.