Buick LaCrosse Warning Lights: What They Mean

Other warnings and indicators

Engine Coolant Temperature Warning Light

The vehicle has overheated; driving with the light on can cause damage. PDF page 128

Charging System Light

Staying on or coming on while driving suggests a problem with the electrical charging system; driving could drain the battery.
What to do: Have it checked by your dealer. If you must drive a short distance, turn off accessories like radio and air conditioner. PDF page 123

Antilock Brake System (ABS) Warning Light

Staying on or coming on while driving means the antilock brakes are not working, though regular brakes still work. With the brake light too, regular brakes have a problem.
What to do: Stop safely, turn off the vehicle, restart to reset. If light stays on or returns, have the vehicle serviced. PDF page 126

Malfunction Indicator Lamp (Check Engine Light)

A malfunction in the emission control diagnostic system has been detected while the engine is running; the vehicle may need service.
What to do: Seek service promptly to possibly prevent damage. PDF page 123

Airbag Readiness Light

If it comes on and stays on, something may be wrong with the airbag system.
What to do: Have the vehicle serviced right away. PDF page 123

Electric Parking Brake Light

Comes on when the parking brake is applied. Continued flashing after release or while driving indicates an Electric Parking Brake problem.
What to do: If it does not come on or keeps flashing, see your dealer. PDF page 126

Service Electric Parking Brake Light

Staying on indicates a problem with the Electric Parking Brake system.
What to do: Take the vehicle to your dealer as soon as possible. PDF page 126

Traction Control System (TCS)/StabiliTrak Light

Steady means TCS and possibly StabiliTrak/ESC are disabled. Flashing means the system is actively working.
What to do: Check DIC messages to see which feature is not working and whether service is needed. PDF page 128

Traction Off Light

Traction Control System has been turned off; wheel spin is not limited.
What to do: Adjust driving accordingly. PDF page 127

StabiliTrak OFF Light

StabiliTrak/ESC is turned off, and TCS is off too, so 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 128

Adaptive Forward Lighting (AFL) Light

Solid means a problem with the AFL system. Flashing means the system is switching between lighting modes. PDF page 130

Security Light

If it stays on and the engine does not start, there may be a problem with the theft-deterrent system. PDF page 130

Low Fuel Warning Light

The fuel tank is low on fuel.
What to do: Add fuel; if the light does not turn off, have the vehicle serviced. PDF page 130

High-Beam On Light

The high-beam headlamps are in use. PDF page 130

Green: system on

Lane Keep Assist (LKA) Light

Green means LKA is available. It turns amber when LKA assists; flashing amber is a Lane Departure Warning that a lane marking was crossed. PDF page 127

Vehicle Ahead Indicator

Green when a vehicle is detected ahead; amber when you are following much too closely. PDF page 127

Summarized in our own words from the 2019 Buick LaCrosse 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.