Cadillac XTS Warning Lights: What They Mean

Red: stop or act now

Brake System Warning Light

There is a brake problem; if it stays on, the brake system may not be working properly.
What to do: Have the brakes inspected right away. If still on after stopping carefully off the road, have the vehicle towed. PDF page 134

Amber: check soon

Lane Keep Assist (LKA) Light

Green when LKA is available; turns amber when it assists, and flashes amber as an LDW alert when a lane marking is crossed. PDF page 136

Other warnings and indicators

Engine Coolant Temperature Warning Light

The vehicle has overheated; driving with this light on can damage the engine. PDF page 137

Airbag Readiness Light

If it comes on and stays on, the airbag system might not be working properly and airbags may not inflate in a crash.
What to do: Have the vehicle serviced right away. PDF page 131

Antilock Brake System (ABS) Warning Light

Antilock brakes are not working; regular brakes still work. With the brake light also on, the regular brakes have a problem too.
What to do: Stop safely, turn off, restart to reset. If it stays on or returns, have it serviced. PDF page 135

Electric Parking Brake Light

Comes on when the parking brake is applied. Continued flashing after release or while driving means an Electric Parking Brake problem.
What to do: If it does not come on or keeps flashing, see your dealer. PDF page 135

Service Electric Parking Brake Light

If it stays on, the electric parking brake system needs service.
What to do: Take the vehicle to a dealer as soon as possible. PDF page 135

Traction Control System (TCS)/StabiliTrak Light

Steady: TCS and possibly StabiliTrak/ESC are disabled. Flashing: the system is actively working.
What to do: Check DIC messages to see which feature isn't working and whether service is needed. PDF page 137

Low Tire Pressure Warning Light

Tire pressure is low. If it flashes about a minute then stays on, the TPMS has a malfunction.
What to do: Stop as soon as possible and inflate tires to the pressure on the Tire and Loading Information label. PDF page 283

Traction Off Light

Traction Control System has been turned off, so wheel spin is not limited.
What to do: Adjust driving accordingly. PDF page 136

StabiliTrak OFF Light

StabiliTrak/ESC is turned off, which also turns TCS off; the system does not assist in controlling the vehicle.
What to do: Turn TCS and StabiliTrak/ESC back on to turn the light off. PDF page 137

Low Fuel Warning Light

The fuel tank is low on fuel.
What to do: Add fuel; if the light stays on afterward, have the vehicle serviced. PDF page 139

Security Light

If it stays on and the engine will not start, there could be a problem with the theft-deterrent system. PDF page 139

Passenger Airbag Status Indicator

ON means the front passenger frontal and knee airbags can inflate; OFF means the sensing system turned them off.
What to do: If both or neither light stay on after several seconds, see your dealer. PDF page 131

High-Beam On Light

The high-beam headlamps are in use. PDF page 139

IntelliBeam Light

The IntelliBeam system, if equipped, is enabled. PDF page 139

Lamps On Reminder

The exterior lamps are in use. PDF page 139

Green: system on

Vehicle Ahead Indicator

Green when a vehicle is detected ahead; amber when following a vehicle much too closely. PDF page 136

Summarized in our own words from the 2019 Cadillac XTS owner's manual (AI-assisted; every light name was matched against its cited page 2026-10-18). Your vehicle may not have every light, and other years can differ. A red warning that stays on usually means stop safely and check: your manual has the final word.