Buick Lucerne Warning Lights: What They Mean

Red: stop or act now

Brake System Warning Light

A brake problem exists; it also comes on when the parking brake is set or does not fully release.
What to do: Pull off the road and stop carefully. Try restarting once or twice; if the light stays on, have the vehicle towed for service. PDF page 189

Engine Coolant Temperature Warning Light

The engine has overheated.
What to do: Pull over and turn off the engine as soon as possible. Never drive with this light on. PDF page 192

Other warnings and indicators

Charging System Light

If it stays on or comes on while driving, there may be a charging system problem, such as a generator drive belt or electrical fault.
What to do: Have it checked right away. If you must drive a short distance, turn off accessories such as the radio and air conditioner. PDF page 188

Antilock Brake System (ABS) Warning Light

The antilock brakes need service if the light stays on or returns while driving. Regular brakes still work if the brake warning light is off.
What to do: Stop safely, turn the ignition off, restart to reset. If the light stays on or returns, have the vehicle serviced. PDF page 189

Traction Control System (TCS) Warning Light

Flashes when the system limits wheel spin. Steady on means a possible system problem or that TCS was manually turned off.
What to do: If it stays on with a SERVICE TRACTION CONTROL message, the vehicle may need service. PDF page 190

Low Tire Pressure Warning Light

Comes on when low tire pressure is detected. Flashing about a minute then staying on indicates a TPMS malfunction. PDF page 352

StabiliTrak Indicator Light

Flashes when the system is operating. Steady on with SERVICE STABILITRAK message means the system is not working.
What to do: Adjust your driving accordingly. PDF page 260

Summarized in our own words from the 2011 Buick Lucerne 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.