Cadillac XT4 Warning Lights: What They Mean

Red: stop or act now

Airbag Readiness Light

If it stays on after starting or comes on while driving, the airbag system may not work properly; airbags might not inflate in a crash.
What to do: Have the vehicle serviced right away. PDF page 102

Brake System Warning Light

Staying on indicates a brake problem; it may come on if brake fluid is low. Braking may need more pedal effort or distance.
What to do: Have brakes inspected right away. If it comes on while driving, stop carefully off the road; if still on, have vehicle towed. PDF page 105

Engine Coolant Temperature Warning Light

The engine has overheated. Driving with it on can damage the engine, and damage may not be covered by warranty.
What to do: See Engine Overheating section. PDF page 108

Engine Oil Pressure Light

If on while the engine runs, oil pressure may be inadequate; oil level may be low or another oil system problem exists.
What to do: Turn the engine off when safe and contact your dealer. PDF page 110

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: See your dealer if it does not come on or keeps flashing. PDF page 105

Amber: check soon

Antilock Brake System (ABS) Warning Light

If it stays on or comes on while driving, ABS needs service. With the brake light also on, regular brakes have a problem too.
What to do: See your dealer for service. PDF page 105

Service Electric Parking Brake Light

If on or coming on while driving, there is an Electric Parking Brake problem; other safety functions using it may be degraded.
What to do: Take the vehicle to a dealer as soon as possible. PDF page 105

Pedestrian Ahead Indicator

A nearby pedestrian is detected in front of the vehicle. PDF page 107

Other warnings and indicators

Traction Control System (TCS)/Electronic Stability Control Light

Steady on means TCS and possibly StabiliTrak/ESC are not fully operational. Flashing means the system is actively working.
What to do: Adjust driving accordingly; if it persists, see your dealer as soon as possible. PDF page 108

Charging System Light

Comes on briefly with ignition on as a check and should go out once the engine starts. PDF page 102

Traction Off Light

Traction Control System has been turned off, so wheel slip during acceleration is not limited unless needed to protect the driveline.
What to do: Adjust driving accordingly. PDF page 107

Electronic Stability Control (ESC) Off Light

StabiliTrak/ESC is turned off, which also turns TCS off; the systems do not assist in controlling the vehicle.
What to do: Adjust driving accordingly. PDF page 108

Automatic Emergency Braking (AEB) Disabled Light

AEB or Front Pedestrian Braking is turned off or unavailable due to malfunction, weather, or a dirty windshield. PDF page 107

Low Fuel Warning Light

Comes on when the fuel gauge nears empty. It turns off when fuel is added.
What to do: If it stays on after adding fuel, have the vehicle serviced. PDF page 110

Security Light

If it stays on and the vehicle does not start, there could be a problem with the theft-deterrent system. PDF page 110

Passenger Airbag Status Indicator

ON means the front passenger frontal and knee airbags may inflate; OFF means the sensing system turned them off.
What to do: If both or neither are lit, or airbag light is on, see your dealer right away. PDF page 102

Auto Stop Indicator

The engine is in an Auto Stop. PDF page 110

High-Beam On Light

The high-beam headlamps are in use. PDF page 110

Green: system on

Vehicle Ahead Indicator

Green when a vehicle is detected ahead; amber when following a vehicle much too closely. PDF page 107

Summarized in our own words from the 2025 Cadillac XT4 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.