2020 GMC Yukon Dashboard Symbols | Warning Messages
The 2020 GMC Yukon’s dashboard is an important part of the interaction between the driver and the vehicle. It shows important information through a variety of icons and warning signs. These symbols are very important for making sure that driving is safe and smooth. They do this by warning of possible technical problems and safety alerts. Each symbol stands for a different system or function in the car, giving drivers information about its state and how well it’s working. Knowing what these marks mean is important for keeping the car in good shape, fixing any problems right away, and staying safe on the road. We go into great detail in this guide about what these dashboard icons and danger messages mean, giving drivers the knowledge they need to feel safe on their trips.
2023 – 2024 GMC YUKON Review, Specs, Price and Mileage (Brochure)
Seat Belt Reminders
Driver Seat Belt Reminder Light
There is a driver seat belt reminder light on the instrument cluster. When the vehicle is started, this light flashes and a chime may come on to remind the driver to fasten their seat belt. Then the light stays on solid until the belt is buckled. This cycle may continue several times if the driver remains or becomes unbuckled while the vehicle is moving. If the driver seat belt is buckled, neither the light nor the chime comes on.
Passenger Seat Belt Reminder Light
There may be a passenger seat belt reminder light near the passenger airbag status indicator. For vehicles equipped with the passenger seat belt reminder light, when the vehicle is started this light flashes and a chime may come on to remind passengers to fasten their seat belts. Then the light stays on solid until the belt is buckled. This cycle continues several times if the passenger remains or becomes unbuckled while the vehicle is moving. If the passenger seat belt is buckled, neither the chime nor the light comes on. The front passenger seat belt reminder light and chime may turn on if an object is put on the seat such as a briefcase, handbag, grocery bag, laptop, or other electronic device. To turn off the reminder light and/or chime, remove the object from the seat or buckle the seat belt.
Airbag Readiness Light
This light shows if there is an electrical problem with the airbag system. The system check includes the airbag sensor(s), passenger sensing system (if equipped), the pretensioners, the airbag modules, the wiring, and the crash sensing and diagnostic module. The airbag readiness light comes on for several seconds when the vehicle is started. If the light does not come on then, have it fixed immediately.
Warning
If the airbag readiness light stays on after the vehicle is started or comes on while driving, it means the airbag system might not be working properly. The airbags in the vehicle might not inflate in a crash, or they could even inflate without a crash. To help avoid injury, have the vehicle serviced right away.
If there is a problem with the airbag system, a Driver Information Center (DIC) message may also come on.
Passenger Airbag Status Indicator
The vehicle has a passenger sensing system. The passenger airbag status indicator is in the overhead console.
When the vehicle is started, the passenger airbag status indicator will light ON and OFF, or the symbols for on and off, for several seconds as a system check. Then, after several more seconds, the status indicator will light either ON or OFF or the on or off symbol, to let you know the status of the front outboard passenger frontal airbag. If the word ON or the on symbol is lit on the passenger airbag status indicator, it means that the front outboard passenger frontal airbag is allowed to inflate. If the word OFF or the off symbol is lit on the airbag status indicator, it means that the passenger sensing system has turned off the front outboard passenger frontal airbag. If, after several seconds, both status indicator lights remain on, or if there are no lights at all, there may be a problem with the lights or the passenger sensing system. See your dealer for service.
Warning
If the airbag readiness light ever comes on and stays on, it means that something may be wrong with the airbag system. To help avoid injury to yourself or others, have the vehicle serviced right away.
Charging System Light
The charging system light comes on briefly when the ignition is turned on, but the engine is not running, as a check to show the light is working. It should go out when the engine is started. If the light stays on, or comes on while driving, there may be a problem with the electrical charging system. Have it checked by your dealer. Driving while this light is on could drain the battery. When this light comes on or is flashing, the Driver Information Center (DIC) also displays a message. If a short distance must be driven with the light on, be sure to turn off all accessories, such as the radio and air conditioner.
Malfunction Indicator Lamp (Check Engine Light)
This light is part of the vehicle’s emission control onboard diagnostic system. If this light is on while the engine is running, a malfunction has been detected and the vehicle may require service. The light should come on to show that it is working when the ignition is in Service Mode. Malfunctions are often indicated by the system before any problem is noticeable. Being aware of the light and seeking service promptly when it comes on may prevent damage.
Caution
If the vehicle is driven continually with this light on, the emission control system may not work as well, the fuel economy may be lower, and the vehicle may not run smoothly. This could lead to costly repairs that might not be covered by the vehicle warranty. Modifications to the engine, transmission, exhaust, intake, or fuel system, or the use of replacement tires that do not meet the original tire specifications, can cause this light to come on. This could lead to costly repairs not covered by the vehicle warranty. This could also affect the vehicle’s ability to pass an Emissions Inspection/ Maintenance test.
If the light is flashing: A malfunction has been detected that could damage the emission control system and increase vehicle emissions. Diagnosis and service may be required. To help prevent damage, reduce vehicle speed and avoid hard accelerations and uphill grades. If towing a trailer, reduce the amount of cargo being hauled as soon as possible. If the light continues to flash, find a safe place to park. Turn the vehicle off and wait at least 10 seconds before restarting the engine. If the light is still flashing, follow the previous guidelines and see your dealer for service as soon as possible.
If the light is on steady: A malfunction has been detected. Diagnosis and service may be required.
Check the following:
- If fuel has been added to the vehicle using the capless fuel funnel adapter, make sure that it has been removed. The diagnostic system can detect if the adapter has been left installed in the vehicle, allowing fuel to evaporate into the atmosphere. A few driving trips with the adapter removed may turn off the light.
- Poor fuel quality can cause inefficient engine operation and poor driveability, which may go away once the engine is warmed up. If this occurs, change the fuel brand. It may require at least one full tank of the proper fuel to turn the light off.
Emissions Inspection and Maintenance Programs
If the vehicle requires an Emissions Inspection/Maintenance test, the test equipment will likely connect to the vehicle’s Data Link Connector (DLC).
The DLC is under the instrument panel to the left of the steering wheel. Connecting devices that are not used to perform an Emissions Inspection/Maintenance test or to service the vehicle may affect vehicle operation. See your dealer if assistance is needed.
The vehicle may not pass inspection if:
- The light is on when the engine is running.
- The light does not come on when the ignition is in Service Mode.
- Critical emission control systems have not been completely diagnosed. If this happens, the vehicle will not be ready for inspection and might require several days of routine driving before the system is ready for inspection. This can happen if the 12-volt battery has recently been replaced or run down, or if the vehicle has been recently serviced.
See your dealer if the vehicle will not pass or cannot be made ready for the test.
Brake System Warning Light
This light should come on briefly when the vehicle is turned on. If it does not come on then, have it fixed so it will be ready to warn you if there is a problem. When the vehicle is on, the brake system warning light also comes on when the parking brake is set. The light stays on if the parking brake does not fully release. If it stays on after the parking brake is fully released, there is a brake problem. Have the brake system inspected right away. If the light comes on while driving, pull off the road and stop carefully. The brake pedal might be harder to push, or the brake pedal may go closer to the floor. It could take longer to stop. If the light is still on, have the vehicle towed for service.
Warning
The brake system might not be working properly if the brake system warning light is on. Driving with the brake system warning light on can lead to a crash. If the light is still on after the vehicle has been pulled off the road and carefully stopped, have the vehicle towed for service.
Antilock Brake System (ABS) Warning Light
This warning light should come on briefly when the vehicle is turned on. If the light does not come on, have it fixed so it will be ready to warn if there is a problem. If the light comes on while driving, safely stop as soon as it is possible and turn off the vehicle. Then turn on the vehicle again to reset the system. If the ABS warning light stays on, or comes on again while driving, the vehicle needs service. A chime may also sound when the light stays on. If the ABS warning light is the only light on, the vehicle has regular brakes, but ABS is not functioning. If both the ABS warning light and the brake system warning light are on, ABS is not functioning and there is a problem with the regular brakes. See your dealer for service.
Four-Wheel-Drive Light
The four-wheel-drive light comes on when the transfer case is shifted into four-wheel drive and the front axle engages. LO or HI will also be next to this light when the vehicle is in a four-wheel low or four-wheel high. Some delay between the shifting and the light coming on is normal.
Tow/Haul Mode Light
For vehicles with the Tow/Haul Mode feature, this light comes on when the Tow/Haul Mode has been activated.
Lane Keep Assist (LKA) Light
After the vehicle is started, this light turns off and stays off if LKA has not been turned on or is unavailable. If available, this light is white if LKA is turned on, but not ready to assist. This light is green if LKA is turned on and is ready to assist. LKA may assist by gently turning the steering wheel if the vehicle approaches a detected lane marking. The LKA light is amber when assisting. This light flashes amber as a Lane Departure Warning (LDW) alert, to indicate that the lane marking has been crossed. LKA will not assist or alert if the turn signal is active in the direction of lane departure, or if LKA detects that you are accelerating, braking, or actively steering.
Vehicle Ahead Indicator
If equipped, this indicator will display green when a vehicle is detected ahead and amber when you are following a vehicle ahead much too closely.
Traction Off Light
This light comes on briefly while starting the engine. If it does not, have the vehicle serviced by your dealer. If the system is working normally, the indicator light then turns off. The traction off light comes on when the Traction Control System (TCS) has been turned off by pressing and releasing the TCS/StabiliTrak/ESC button. This light and the StabiliTrak/ESC OFF light come on when StabiliTrak/ Electronic Stability Control (ESC) is turned off. If the TCS is off, wheel spin is not limited. Adjust driving accordingly.
StabiliTrak OFF Light
This light comes on briefly while starting the engine. If it does not, have the vehicle serviced by your dealer. This light comes on when the StabiliTrak/Electronic Stability Control (ESC) system is turned off. If StabiliTrak/ESC is off, the Traction Control System (TCS) is also off. If StabiliTrak/ESC and TCS are off, the system does not assist in controlling the vehicle. Turn on the TCS and the StabiliTrak/ESC systems, and the warning light turns off.
Traction Control System (TCS)/StabiliTrak Light
This light comes on briefly when the engine is started. If the light does not come on, have the vehicle serviced by your dealer. If the system is working normally, the indicator light turns off. If the light is on and not flashing, the TCS and potentially the StabiliTrak/ ESC system have been disabled. A Driver Information Center (DIC) message may be displayed. Check the DIC messages to determine which feature(s) are no longer functioning and whether the vehicle requires service. If the light is on and flashing, the TCS and/or the StabiliTrak/ESC system is actively working.
Engine Coolant Temperature Warning Light
This light comes on briefly while starting the vehicle. If it does not, have the vehicle serviced by your dealer. If the system is working normally the indicator light goes off.
Caution
The engine coolant temperature warning light indicates that the vehicle has overheated. Driving with this light on can damage the engine and it may not be covered by the vehicle warranty.
The engine coolant temperature warning light comes on when the engine has overheated. If this happens, pull over and turn off the engine as soon as possible.
Tire Pressure Light
For vehicles with the Tire Pressure Monitor System (TPMS), this light comes on briefly when the engine is started. It provides information about tire pressures and the TPMS.
When the Light Is On Steady
This indicates that one or more of the tires are significantly underinflated. A Driver Information Center (DIC) tire pressure message may also display. Stop as soon as possible, and inflate the tires to the pressure value shown on the Tire and Loading Information label.
When the Light Flashes First and Then Is On Steady
If the light flashes for about a minute and then stays on, there may be a problem with the TPMS. If the problem is not corrected, the light will come on at every ignition cycle.
Engine Oil Pressure Light
Caution
Lack of proper engine oil maintenance can damage the engine. Driving with the engine oil low can also damage the engine. The repairs would not be covered by the vehicle warranty. Check the oil level as soon as possible. Add oil if required, but if the oil level is within the operating range and the oil pressure is still low, have the vehicle serviced. Always follow the maintenance schedule for changing engine oil.
This light should come on briefly as the engine is started. If it does not come on, have the vehicle serviced by your dealer. If the light comes on and stays on, it means that oil is not flowing through the engine properly. The vehicle could be low on oil and might have some other system problem. See your dealer.
Low Fuel Warning Light
This light is near the fuel gauge and comes on briefly when the ignition is turned on as a check to show it is working. It also comes on when the fuel tank is low on fuel. The light turns off when fuel is added. If it does not, have the vehicle serviced.
Security Light
The security light should come on briefly as the engine is started. If it does not come on, have the vehicle serviced by your dealer. If the system is working normally, the indicator light turns off. If the light stays on and the engine does not start, there could be a problem with the theft-deterrent system.
High-Beam On Light
This light comes on when the high-beam headlamps are in use.
IntelliBeam Light
This light comes on when the IntelliBeam system, if equipped, is enabled.
Front Fog Lamp Light
For vehicles with fog lamps, this light comes on when the fog lamps are on. The light goes out when the fog lamps are turned off.
Lamps On Reminder
This light comes on when the exterior lamps are in use, except when only the Daytime Running Lamps (DRL) are active.
Cruise Control Light
The cruise control light is white when the cruise control is on and ready, and turns green when the cruise control is set and active.
Adaptive Cruise Control Light
This light is white when the Adaptive Cruise Control (ACC, if equipped) is on and ready, and turns green when the ACC is set and active.
Door Ajar Light
This light comes on when a door is open or not securely latched. Before driving, check that all doors are properly closed.
FAQs
The exclamation mark inside a triangle typically signals a warning related to the vehicle’s safety systems, such as low tire pressure or a malfunction in the traction control system.
The battery symbol usually indicates a problem with the vehicle’s charging system or battery. It could suggest issues such as a failing alternator or a low battery charge.
The wrench symbol often indicates a general maintenance reminder or a need for service. It may also appear alongside a specific message indicating the nature of the required maintenance.
The check engine light typically indicates an issue with the vehicle’s engine or emissions system. It could range from a minor problem like a loose gas cap to a more serious issue requiring immediate attention.
The key symbol usually suggests an issue related to the vehicle’s security system, such as a problem with the key fob or an attempted theft.
The oil can symbol usually indicates low engine oil pressure, which could lead to engine damage if not addressed promptly.
The thermometer symbol typically indicates that the engine is overheating, which requires immediate attention to prevent potential damage.
The gas pump symbol usually indicates that the vehicle is running low on fuel and needs to be refueled soon.
The seatbelt symbol serves as a reminder for occupants to fasten their seatbelts for safety while driving.
The door open symbol typically indicates that one or more doors of the vehicle are not securely closed.
The padlock symbol usually indicates that the vehicle’s security system is activated or that there is an issue with the system.
The tire with an exclamation mark symbol typically indicates low tire pressure or a problem with the tire pressure monitoring system (TPMS).
The snowflake symbol usually indicates that the outside temperature is near freezing, warning drivers of potentially icy road conditions.
The windshield with wipers symbol typically indicates that the windshield wipers are active or that there is a problem with the wiper system.
The steering wheel with an exclamation mark symbol typically indicates a problem with the vehicle’s power steering system, such as low power steering fluid or a malfunction.
Useful Links
View Full PDF:GMC Yukon 2020 User Manual | Auto User Guide
2023 – 2024 GMC YUKON Review, Specs, Price and Mileage (Brochure)