How to Jump Start a Cadillac CT4

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 firmly and shift to P (Park) with an automatic or N (Neutral) with a manual transmission.
3. Turn the ignition off and switch off all lights and accessories in both vehicles, except hazard flashers if needed.
4. Connect the red positive (+) cable to the remote positive (+) terminal on the discharged battery, then to the positive (+) terminal of the good battery.
5. Connect the black negative (–) cable to the good battery's negative (–) terminal, then to the discharged battery's negative (–) grounding point.
6. Start the engine of the vehicle with the good battery and let it idle at least four minutes, then try starting the other vehicle.
7. To remove the cables, reverse Steps 6–9 in exact order.

• The remote positive terminal is under a cover on the passenger side; lift the cover to expose it.
• If the vehicle will not start after a few tries, it probably needs service.
• Let the started vehicle idle for several minutes after removing the cables.

Source: 2026 Cadillac CT4 owner's manual, PDF pages 350, 351, 352. 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.