How to Jump Start a Cadillac ELR

1. Attach the red positive (+) cable to the ELR's positive (+) terminal (1), keeping the other end off any metal.
2. Attach the other end of the red positive (+) cable to the positive (+) terminal of the other vehicle.
3. Attach the black negative (−) cable to the negative (−) battery terminal of the other vehicle, keeping its free end clear of everything.
4. Attach the other end of the black negative (−) cable to the ELR's negative (−) terminal (2).
5. Press the POWER O button to start; once the cluster initializes, the ELR charges its 12-volt battery from the high voltage battery.
6. Disconnect in reverse: black from the ELR, black from the other vehicle, red from the other vehicle, then red from the ELR.

• Connecting or removing the cables in the wrong order can cause electrical shorting that the warranty does not cover.
• If the ELR does not start, call your dealer or Roadside Service.
• After the jumper cables are removed, let the vehicle idle for several minutes.

Source: 2016 Cadillac ELR owner's manual, PDF pages 302, 304, 305. 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.