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?

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: Where are the safety labels located?

Your vehicle has a few different safety labels to help you understand dangers and potential hazards for your vehicle. The labels have different pieces of information, and are located in a few different spots: 1. The driver side doorjamb. 2....

Q: Canister purge valve code keeps popping up even after it was replaced.

This means that the problem was either not the canister purge valve or the wrong part was replaced. The electronic control computer can detect faults in components as well as their circuits. An electrical problem like an open circuit or...

Q: What does the Seat Belt warning light and chime mean?

It’s vital that you and your passengers are buckled up for safety. Not only is it the law in most US states, but it’s just good common sense. Your Altima is designed to detect when there’s a seat belt not...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...