How to Jump Start a Cadillac CT6

1. Check that the other vehicle has a 12-volt battery with a negative ground system, and park the two vehicles so they do not touch.
2. Set the parking brake, shift to P (Park), turn the ignition off, and turn off all lights and accessories in both vehicles.
3. Connect one end of the red positive (+) cable to the remote positive (+) terminal on the discharged battery, under the red cover.
4. Connect the other end of the red positive (+) cable to the positive (+) terminal of the good battery.
5. Connect one end of the black negative (–) cable to the negative (–) terminal of the good battery.
6. Connect the other end of the black negative (–) cable to the remote negative (–) ground terminal on the driver side shock tower.
7. Start the engine of the good vehicle and run it at idle for at least four minutes, then try starting the dead vehicle.

• Remove the cables in exactly the reverse order, then let the started vehicle idle for several minutes.
• If the vehicle will not start after a few tries, it probably needs service.
• Connecting or removing the cables in the wrong order can cause electrical shorting and damage.

Source: 2020 Cadillac CT6 owner's manual, PDF pages 346, 347. 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.