Skip the auto shop - Our mechanics make house calls

Q: What does the Master warning light on the dash mean?

asked by on

What does the Master warning light on the dash mean?

A: The Master Warning Light is usually accompa...

The Master Warning Light is usually accompanied by another warning light, and indicates that one or more warning systems have been detected. The Master Warning Light ranges in its levels of significance and severity. It is important to check your vehicle before operating it, to try and determine the cause of the Master Warning Light. If you are unable to make a determination as to the cause of the Master Warning Light, it would be a good idea to have it diagnosed to check if there is a serious issue present that needs to be addressed immediately.

Dashboard indicator lights and their meaning may differ depending on the make and model of a vehicle, but the following are some potential reasons for why the Master Warning Light may be on in the dashboard:

  • Low tire pressure
  • Low fuel
  • Low washer fluid
  • Low coolant
  • Low battery voltage
  • A door is ajar
  • The parking brake is still engaged
  • Headlights have been left on
  • The fuel cap is loose or missing

If you are having trouble figuring out why this light is on, you can have a certified mechanic, such as one from YourMechanic, diagnose your Master Warning Light to have this issue resolved.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: What safety tips should I follow when towing a trailer?

Adding a trailer to your car means that you have additional weight to deal with, but it also means that you have additional length. Depending on the load you’re carrying, it may also mean additional height. Follow these simple safety...

Q: 2013 Subaru Impreza. Speedometer not working. Abs light on check engine light on and brake light on what could be going on?

Hello, thank you for writing in. The multiple lights coming on is a sign that one of the major components in the vehicle is failing. Considering the lights all seem to be related to the ABS or wheel speed sensors,...

Q: What does the Engine Oil Pressure warning light on the dash mean?

The Engine Oil Pressure Warning Light on the dashboard is most commonly an indication that the engine is burning oil or that the engine is losing oil. Some other reasons that the Engine Oil Pressure Warning Light is on in...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...