GMC Yukon Denali Warning Lights: What They Mean

Red: stop or act now

Brake System Warning Light

Comes on if the parking brake is set or not fully released, or if the brake system has a problem.
What to do: If it comes on while driving, pull off and stop carefully. If still on, have the vehicle towed for service. PDF page 134

Charging System Light

There may be a problem with the electrical charging system; driving with it on could drain the battery.
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 131

Amber: check soon

Antilock Brake System (ABS) Warning Light

The antilock brakes are not functioning; regular brakes still work unless the brake system light is also on.
What to do: Stop safely, turn off, and restart. If the light stays on or returns, have the vehicle serviced. PDF page 134

Traction Control System (TCS)/StabiliTrak® Light

Steady means TCS and possibly StabiliTrak are disabled. Flashing means the systems are actively working.
What to do: Check the DIC messages to see which feature is not working and whether service is needed. PDF page 136

Other warnings and indicators

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 131

StabiliTrak® OFF Light

StabiliTrak is turned off, which also turns off TCS, so the system does not assist in controlling the vehicle.
What to do: Turn the TCS and StabiliTrak systems back on to turn the light off. PDF page 136

Traction Off Light

The Traction Control System has been turned off using the TCS/StabiliTrak button, so wheel spin is not limited.
What to do: Adjust driving accordingly. PDF page 136

Low Fuel Warning Light

The fuel tank is low on fuel.
What to do: Add fuel; the light turns off. If it does not, have the vehicle serviced. PDF page 138

Security Light

If it stays on and the engine does not start, there could be a problem with the theft-deterrent system.
What to do: See Immobilizer Operation in the manual. PDF page 138

Passenger Airbag Status Indicator

ON means the front passenger airbag may inflate; OFF means the sensing system turned it off. If both or neither stay lit, there may be a problem.
What to do: If both or no lights remain after several seconds, see your dealer for service. PDF page 131

High-Beam On Light

The high-beam headlamps are in use. PDF page 138

IntelliBeam® Light

The IntelliBeam system, if equipped, is enabled. PDF page 138

Summarized in our own words from the 2016 GMC Yukon Denali 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.