What does "Master warning light" mean?

The master warning light is a generic warning light found on most vehicles' instrument panels. It is usually illuminated when there is a problem with the vehicle's electrical system or when a major component needs to be serviced. The master warning light may also be referred to as the check engine light, service engine soon light, or maintenance required light. Here are some reasons that may cause the master warning light to come on: A problem with the battery or alternator A loose gas cap A problem with the emissions system A problem with the cooling system A brake system problem A problem with the steering system A suspension problem A tire pressure issue