GMC Sierra 1500 Warning Lights: What They Mean

Amber: check soon

Pedestrian Ahead Indicator

A pedestrian is detected in front of the vehicle. PDF page 129

Other warnings and indicators

Service Electric Parking Brake Light

Problem with the electric parking brake; other safety functions that use it may also be affected. May show briefly at startup as a normal test.
What to do: Take the vehicle to a dealer as soon as possible. PDF page 127

Antilock Brake System (ABS) Warning Light

ABS has detected a problem and is not working as expected, though regular brakes still work. Also shows if the front axle lock is engaged.
What to do: See your dealer for service. If the brake system warning light is also on, both systems are affected. PDF page 127

Electric Parking Brake Light

Shows when the parking brake is applied. Flashing after release or while driving means a problem with the system.
What to do: If the light does not display or keeps flashing, see your dealer. PDF page 127

Traction Off Light

The Traction Control System is turned off; turning off StabiliTrak also turns off traction control. Wheel slip does not limit acceleration unless needed to protect the driveline.
What to do: Adjust your driving accordingly. PDF page 129

Traction Control System (TCS)/Electronic Stability Control Light

Flashes when traction control and/or StabiliTrak stability control is actively working. Shows briefly at startup as a normal test. PDF page 129

Green: system on

Vehicle Ahead Indicator

Green when a vehicle is detected ahead; amber if you are following a vehicle too closely. PDF page 129

Regular Cruise Control Indicator

Lit green when regular cruise control is engaged; the following gap is not displayed. PDF page 256

Summarized in our own words from the 2026 GMC Sierra 1500 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.