Why does my GLS550’s check engine light come on when I start it?

It's okay if your check engine light comes on when you first start your vehicle. It’s just your GLS550 firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.

Why is my Mercedes-Benz GLS550 making engine noise?

Strange engine sounds can be a sign something’s off in your Mercedes-Benz GLS550. Tapping or knocking could mean you're low on oil. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing can be traced back to a loose fan belt, and grinding might be a sign of brake problems rather than engine issues.

What could damage my Mercedes-Benz GLS550 engine?

Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, revving your engine while the vehicle is in Park, or pushing 'the pedal to the metal' before the engine has warmed up. Steer clear of these habits to help protect engine performance and efficiency.

Is it okay to put water in my Mercedes-Benz GLS550 radiator?

Only in emergencies. A 50/50 mix of coolant and water (or a pre-mixed) coolant is recommended. However, if you must keep driving when you're out of coolant, it's better to drive with water in your coolant reservoir than nothing.

What can cause the engine in my GLS550 to suddenly stop?

Reasons your GLS550 car engine may suddenly stop include engine overheating, electrical troubles, mechanical issues, ignition system problems, faulty sensors, and low fuel.

Who fixes Mercedes-Benz GLS550 engines?

For Mercedes-Benz GLS550 engine repair, trust your local Firestone Complete Auto Care. You can make an appointment today at any of our thousands of locations across the U.S.

Reliable Repairs for 2018 Mercedes-Benz GLS550 Engines

Learn about

2018 Mercedes-Benz GLS550 Trim Options

Select your Mercedes-Benz GLS550 trim level to learn more about Mercedes-Benz-recommended engine repair. Use the following chart to find information.

V8/4.7L

Repairs for Your 2018 Mercedes-Benz GLS550

Nothing stays the same forever. Even your Mercedes-Benz GLS550’s engine parts and components will change. We’re here to help when something stops working. Select a repair or category to learn more about 2018 Mercedes-Benz GLS550 services.

We’re Trained to Care for Mercedes-Benz GLS550 Engines

The Mercedes-Benz GLS550 is respected for its reliability. You may have even been thinking about that when you bought it. Even so, pieces and parts can break down over time. Things can go wrong on the road. When they do, you might find yourself searching for 2018 Mercedes-Benz GLS550 engine repair or replacement parts. Luckily, you won’t have to look far, since Firestone Complete Auto Care has 1,700+ locations across the country. We've serviced more than 500 million vehicles since 1926, and our technicians know Mercedes-Benz GLS550 engines. Schedule an appointment if you're experiencing problems that could require engine repair. Firestone Complete Auto Care is a top choice for professional engine diagnosis, service, and repair at an affordable price.

My 2018 Mercedes-Benz GLS550 Check Engine Light Is On

As soon as your GLS550 check engine light turns on, it’s time to get an expert’s opinion. A steady or flashing check engine light could signal a serious issue with your vehicle's ignition, Potential causes may include a faulty oxygen sensor, damaged spark plug, a clogged catalytic converter, or a leaking engine vacuum, but that's only a few of the possible causes. Bring your GLS550 to Firestone Complete Auto Care to get computerized diagnostics and we’ll figure out why that check engine light is giving you grief. Other signs it's time for Mercedes-Benz GLS550 engine service might include essential fluid leaks, or misfiring.

Mercedes-Benz GLS550 Engine Repair

When your Mercedes-Benz GLS550 engine needs repairs, our technicians will make sure you understand what’s going on before they start working on your engine. We don't start working until we have your approval. If a repair can wait, we'll let you know. But if immediate repairs are necessary for your safety, we’ll make sure that's clear, too. We want to provide you with the information you need to make an informed engine repair decision. Choose Firestone Complete Auto Care for Mercedes-Benz GLS550 engine repairs and you can feel confident knowing that we use Mercedes-Benz-approved parts and components like the serpentine belt, engine oil seal, fuses, or other parts.

Engine Q&A 2018 Mercedes-Benz GLS550

Why does my GLS550’s check engine light come on when I start it? It's okay if your check engine light comes on when you first start your vehicle. It’s just your GLS550 firing up its circuits. The dash light shouldn't stay on. If it does, you might want to bring your vehicle in for service.
Why is my Mercedes-Benz GLS550 making engine noise? Strange engine sounds can be a sign something’s off in your Mercedes-Benz GLS550. Tapping or knocking could mean you're low on oil. Whistling sounds could mean you have an intake leak or misaligned belt. Squealing can be traced back to a loose fan belt, and grinding might be a sign of brake problems rather than engine issues.
What could damage my Mercedes-Benz GLS550 engine? Some driving habits are not so great for your engine. These include driving on a near-empty gas tank, revving your engine while the vehicle is in Park, or pushing 'the pedal to the metal' before the engine has warmed up. Steer clear of these habits to help protect engine performance and efficiency.
Is it okay to put water in my Mercedes-Benz GLS550 radiator? Only in emergencies. A 50/50 mix of coolant and water (or a pre-mixed) coolant is recommended. However, if you must keep driving when you're out of coolant, it's better to drive with water in your coolant reservoir than nothing.
What can cause the engine in my GLS550 to suddenly stop? Reasons your GLS550 car engine may suddenly stop include engine overheating, electrical troubles, mechanical issues, ignition system problems, faulty sensors, and low fuel.
Who fixes Mercedes-Benz GLS550 engines? For Mercedes-Benz GLS550 engine repair, trust your local Firestone Complete Auto Care. You can make an appointment today at any of our thousands of locations across the U.S.