How to Jump Start a Cadillac CT5

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 put your vehicle in P (Park) with an automatic transmission, or N (Neutral) with a manual.
3. Turn the ignition off, and turn off all lights and accessories in both vehicles except hazard flashers if needed.
4. Connect one end of the red positive (+) cable to the remote positive (+) terminal on the discharged battery, then the other end to the good battery's positive (+) terminal.
5. Connect one end of the black negative (–) cable to the good battery's negative (–) terminal.
6. Connect the other black end to the negative (–) grounding point for the discharged battery, not to the dead battery itself.
7. Start the vehicle with the good battery and let it idle for at least four minutes, then try starting the dead vehicle.

• The remote terminals for the discharged battery are on the driver side; the positive one is under a cover you lift.
• To remove the cables, reverse Steps 6–9 in exact order, then let the started vehicle idle for several minutes.
• If the vehicle will not start after a few tries, it probably needs service.

Source: 2026 Cadillac CT5 owner's manual, PDF pages 363, 364, 365. 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.