How to Jump Start a GMC Sierra 1500

1. Park the vehicles close enough for the cables to reach without touching, set the parking brake on both, and put automatic transmissions in P (Park).
2. Turn the ignition off on both vehicles and switch off or unplug unneeded accessories, radio and lights.
3. Check that the jumper cables have no loose or missing insulation.
4. Connect one end of the red positive (+) cable to the discharged battery positive (+) terminal.
5. Connect the other end of the positive (+) cable to the good battery positive (+) terminal, or the remote positive (+) terminal if there is one.
6. Connect the black negative (−) cable to the good battery negative (−) terminal, then the other end to the discharged vehicle's negative (−) grounding point.
7. Start the vehicle with the good battery and run it for a while, then try starting the vehicle with the dead battery.

• Never connect the negative (−) cable to the dead battery's negative (−) terminal, as this can cause sparks.
• To remove the cables, reverse Steps 8–11 in exact order, then let the started vehicle idle for several minutes.
• On a four-wheel-drive vehicle, make sure the transfer case is in a drive gear, not N (Neutral).

Source: 2026 GMC Sierra 1500 owner's manual, PDF pages 381, 382. 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.