How to Jump Start a GMC Yukon and Yukon XL

1. Make sure the other vehicle has a 12-volt battery with a negative ground, and park the vehicles close but not touching.
2. Set the parking brake on both vehicles, put an automatic in P (Park), and turn the ignition off on both.
3. Turn off or unplug unneeded accessories, radio and lights, then check that the jumper cables have no damaged insulation.
4. Connect one end of the red positive (+) cable to the discharged battery positive (+) terminal.
5. Connect the other red end to the good battery positive (+) terminal, without letting it touch metal first.
6. Connect the black negative (−) cable to the good battery negative (−) terminal, keeping the other end clear of anything.
7. Connect the other black end to the discharged battery negative (−) grounding point, then start the good vehicle and run it for a while.
8. Try starting the vehicle with the dead battery; if it will not start after a few tries, it probably needs service.

• The discharged battery positive (+) terminal is under a cover on the passenger side; the negative grounding point is also on the passenger side.
• To remove the cables, reverse Steps 8–11 in exact order, then let the revived vehicle idle for several minutes.
• Do not connect the negative (−) cable to the dead battery's negative (−) terminal because this can cause sparks.

Source: 2026 GMC Yukon and Yukon XL owner's manual, PDF pages 374, 375. 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.