Buick Regal Warning Lights: What They Mean

Amber: check soon

Lane Keep Assist (LKA) Light

Amber when LKA is assisting; flashing amber is a lane departure warning that a lane marking was crossed. White: on but not ready; green: ready. PDF page 124

Pedestrian Ahead Indicator

A nearby pedestrian is detected in front of the vehicle. PDF page 125

Vehicle Ahead Indicator

Amber means you are following a vehicle ahead much too closely; green means a vehicle is detected ahead. PDF page 124

Other warnings and indicators

Airbag Readiness Light

Electrical problem in the airbag system; airbags might not inflate in a crash or could inflate without one.
What to do: Have the vehicle serviced right away. A light that fails to come on at startup should also be fixed immediately. PDF page 119

Engine Coolant Temperature Warning Light

The engine has overheated; driving with it on can damage the engine and may not be covered by warranty.
What to do: Pull over and turn off the engine as soon as possible. PDF page 126

Charging System Light

If it stays on or comes on while driving, there may be a problem with the electrical charging system; the battery could drain.
What to do: Have it checked by your dealer. If driving a short distance, turn off all accessories such as radio and air conditioner. PDF page 120

Malfunction Indicator Lamp (Check Engine Light)

Part of the emission control diagnostic system; on while the engine runs means a malfunction was detected and service may be needed.
What to do: Seek service promptly to possibly prevent damage. PDF page 120

Traction Control System (TCS)/StabiliTrak Light

On and steady: TCS and possibly StabiliTrak/ESC are disabled. Flashing: the system is actively working.
What to do: Check the DIC messages to see which feature is not working and whether service is needed. PDF page 126

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 125

Traction Off Light

Traction Control System has been turned off, so wheel spin is not limited. Also on when StabiliTrak/ESC is off.
What to do: Adjust driving accordingly. PDF page 125

Summarized in our own words from the 2020 Buick Regal 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.