Mercedes SLS AMG Wont Start? Here’s Quick Solutions to Most Common Problems

Mercedes SLS AMG

Intro

As an experienced mechanic with over two decades of hands on experience, I’ve seen plenty of people struggling when their Mercedes SLS AMG Won’t Start. And let’s face it, not being able to start your car when you need to drive is extremely bothersome.

But don’t lose hope, you’ve come to the right place, no need to keep googling searches like “reason a Mercedes won’t start“, I got you covered. My name’s Robby, a certified auto mechanic with over two decades of experience, and in this guide, I’ll explain the usual causes for why your SLS AMG struggles to start. I’ll discuss all the commonplace offenders so you can diagnose what’s happening, plus what to do to resolve each particular situation. Drawing on my 20 years of personal experience, I’ll offer practical repair advice to get your Mercedes SLS AMG started as quick as possible!

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Why Won’t My a Mercedes Start?

Mercedes SLS AMG wont start

Before we tackle the list of possible issues and solutions, it’s key to first gain an understanding of the central issue. When you climb into your Mercedes SLS AMG and realize “it won’t start!”, there could be a number of components causing the headaches. Maybe the engine isn’t cranking at all, or maybe it’s turning over partially yet not igniting. Or you might notice clicking sounds when you try to start it, but sadly no ignition occurs. All these situations can be a sign of various problems under the hood.

Common Reasons Why Your Mercedes SLS AMG Won’t Start

There are many culprits as to why your SLS AMG won’t turn on. Typical causes cover a dead or weak battery, broken alternator, starter motor issues, fuel system snags, plus electrical or wiring defects. Each of these issues can show up differently, needing specific methods of troubleshooting and fixing to get you driving again as quick as possible. All of which, we’ll delve into.

Symptoms of a Mercedes SLS AMG That Won’t Start

Recognizing these red flags will lead you to the core cause. For instance, when you turn the key or press the start button and you hear it clicking but no ignition, it often means a problem with either fuel delivery or ignition issues.

Analysis of The Reasons Why Your Mercedes SLS AMG Won’t Start

The first step in fixing the no-start hassle is understanding the exact origin of the issue. So let’s take a closer look at the most frequent reasons behind the SLS AMG failing to start when you turn the key.

Battery Issues in a Mercedes SLS AMG

car wont start but battery is good
Image Credit: MechanicAnswer.com

In the majority of cases, the most frequent reason a Mercedes SLS AMG won’t start comes down to battery troubles. Specifically, a drained or weak battery prevents the engine from cranking. The car’s battery provides the required power to start the engine and activate all your vehicle’s electrical components. Symptoms of a failing battery entail labored or difficult cranking, dim headlights, or a battery alert symbol illuminated on the dash. A battery charger can recharge a drained battery if you don’t have the help of another vehicle to jump start it, but do have an electrical socket nearby like at home.  And a portable jump starter lets you charge p the battery without another vehicle, and by the roadside without the need for an electrical socket, so you are never stuck.

Alternator Problems in a Mercedes SLS AMG

car wont start alternator

The Alternator keeps the battery charged by harnessing engine power while driving. A worn out alternator can easily prevent your Mercedes SLS AMG from starting since it cannot recharge the battery, draining it completely so that one day you climb into your beloved Mercedes SLS AMG and it just can’t start. Signs of a faulty alternator can be a lit up battery or alternator caution light on its dashboard, faint headlights while idling, or a grinding noise from the engine while running.

Starter Motor Failures in a Mercedes SLS AMG

car wont start wont turn over

The starter motor is key to cranking the engine when you go to start up your Mercedes. If the starter is faulty, the engine may fail to crank, preventing your SLS AMG from starting. Listen for clicking sounds when you turn the key or grinding during cranking, which could indicate starter issues.

Fuel System Issues in a Mercedes SLS AMG

car wont start fuel filter

We’re not talking about running out of gas like a silly goose. Instead, it’s problems in the fuel system itself potentially leaving your SLS AMG unable to start up. Your Mercedes SLS AMG uses gas to combine with oxygen and runs the engine. So problems here like a clogged fuel filter or damaged fuel pump relay may mean the engine is unable to get the fuel it needs to start. Fuel injectors can also get clogged over time, so try a fuel injector cleaner like Red Line to clear any blockages and improve starting.

Electrical System or Wiring Problems in a Mercedes SLS AMG

car wont start electrical issue
Image Credit: MechanicAnswer.com

Ok, well yes that image is a joke, but I want to emphasize modern cars now rely heavily on electronics, opening up what can go wrong. With older vehicles, the usual suspects include blown fuses, ignition problems, damaged ignition switches, or broken sensors. Electrical issues and electronics like these may prevent your Mercedes SLS AMG from starting. Pay attention to your car only starting sometimes, warning lights, or failure to crank as indicators pointing to an underlying electrical problem. Diagnosing and repairing these typically requires a certified mechanic near you.

Solutions: Let’s Get Your Mercedes SLS AMG Starting Again!

If you think you might know what the issue may be, it’s time to figure out the cause of your car’s inability to start up, and then the logical next move is to attempt to fix the issue. Here’s advice for the frequent issues we’ve discussed up to this point:

How to Identify and Fix Battery Issues in a Mercedes SLS AMG

car not starting but battery is fine

If you suspect a battery issue is to blame for your Mercedes’s trouble starting, first examine the battery terminals Verify they are corrosion-free, secure, and correctly connected. If the terminals are in fact dirty, try cleaning them with a sodium bicarbonate(baking soda) and water mixture.

Once you have checked the battery terminals, you can check to see if the battery is just out of charge, or worse, it’s old and weak, or dead and needs to be replaced. For this, you can charge the battery in a few different ways:

If the battery charges fully and performs as expected, the issue may be resolved. However, replacing the battery will be required if it is aged, dead or lacks capacity. Otherwise, even sufficiently charging it to start your SLS AMG may only provide temporary relief before it likely runs out of power again soon. Using a multimeter or OB2 scanner to evaluate the battery’s condition can determine if it’s worth preserving or requires swapping out. Suitable replacement batteries for your specific Mercedes can be found on Amazon here by entering your vehicle details to filter for the right fit and choosing a highly-rated seller.

Robby Recommends:

Portable Car Battery Jump Starter Charger - NOCO Boost Plus GB40

At Home Battery Charger - YONHAN - Fully Automatic

Jumper Cables by Energizer for Car Battery - Heavy Duty

NOCO Boost Plus GB40 1000A UltraSafe Car Battery Jump Starter

YONHAN Battery Charger Fully-Automatic

Energizer Jumper Cables for Car Battery, Heavy Duty

If charging your SLS AMG’s battery fails to solve ongoing issues like frequent draining and recharging even after installing a new battery, an underlying problem likely causes the excessive drain. Professional diagnostic services would then be needed to inspect and identify the root cause. You can also consult a mechanic online through us or obtain an instant quote from a mobile mechanic.

How to Identify and Fix Alternator Problems in a Mercedes SLS AMG

Car wont start replace alternator needed

If you suspect the alternator is causing your car to have issues starting, you can test it yourself. If you can temporarily get the vehicle running (you may need a jump start), with the engine on, remove the positive battery terminal. If the vehicle dies right quickly after that, it’s likely a bad alternator. However, be careful this test can be dangerous and harm delicate electronics in your motor, so it’s best to consult with a professional mechanic locally or online first since this test risks harming the delicate electronics in your Mercedesvehicle.

If you figure out that the alternator is the problem, it’s a case of having it replaced. I recommend consulting an online or local mechanic as they will advise you on how difficult the repair is for your specific model, and you can work out if you want to try it yourself, or with the advice of an online mechanic

If you do want to try it yourself or take it to a local garage, you can often buy the replacement parts yourself cheaper than at the garage, but you need to know what to get for your model of Mercedes SLS AMG. You find all the information you need about your specific vehicle by searching online for something like “vin check license plate Mercedes“, which is a purchasable report, that will give the specs for your vehicle and which parts are compatible, and then you can go get the alternator parts you need. However, an easier option is, Amazon probably has the alternator you need online, at a cheaper price, and their site easily shows which ones will go in your specific car model. Check the Amazon alternator page here

How to Identify and Fix Starter Motor Problems in a Mercedes SLS AMG

starter motor issues in a ford

If you believe the starter motor might be causing your Mercedes SLS AMG to not start up, listen closely for a clicking sound when you try and start it. If present, but the engine does not turn over, the starter motor likely needs replacing. You can take it to a local garage and have them repair it, or repair it yourself with the help and advice from an online mechanic guiding you. 

If you need it, one of the cheapest and easiest places to get a new starter motor, for your exact vehicle model is on the Amazon here.

How to Identify and Solve Fuel System Problems in a Mercedes SLS AMG

clogged fuel filter car wont start

If you think a fuel system issue might be to blame for the no-start, tune your ears for the fuel pump noise when you flip the key to “on” before trying to turn over the car. The pump should emit a quiet humming for a few seconds. If such a noise is not heard, the fuel pump could be defective. Difficult starting, stalling, or lagging acceleration may also come from a clogged fuel filter. Both pump and filter issues normally require a skilled mechanic to diagnose and fix them properly, often using fuel pressure testing and precise diagnostic gear. Later in this article, I detail the best ways to get help from a local Mercedes mechanic near you. 

How to Repair Electrical or Wiring Issues in a Mercedes SLS AMG

fuses to check when car wont start

If you think it’s an wiring issue, first check the fuses for the ignition system, and swap out any that have blown. If your SLS AMG starts after this, it was a successful, inexpensive fix! However, if it still won’t start, even sometimes, the ignition switch itself could be the cause of the issue. Warning lights on the dashboard could additionally mean a faulty component. These can be intricate issues needing a professional mechanic to identify and properly repair (see below advice on local mechanics).

How to Prevent Starting Issues in a Mercedes SLS AMG

As my dad would say: “An ounce of prevention is worth a pound of cure”. Here’s how to avoid future problems starting your SLS AMG:

Routine Upkeep of Your Mercedes SLS AMG

Regular maintenance on car to prevent starting issues

Routine maintenance is essential to avoiding issues, including oil changes, checking the battery, cleaning terminals, replacing the fuel filter as needed, and having a mechanic inspect the vehicle regularly. If confused about maintenance for your model, consult a mechanic locally or online for guidance.

Drive Your SLS AMG Frequently

drive regular to avoid car troubles

If your Mercedes SLS AMG happens to sit unmoved in your garage or driveway for extended times without being driven, the battery can deplete as it is not being recharged by the engine running, through the alternator. Try your best to drive your car regularly to maintain a charged battery. If you remember you have not driven your car in a while, take it for a brief spin around town to ensure there is still a charge left.

Note: Letting the battery completely run out of charge is also bad for its longevity, so try to avoid that.

Pay Attention to Warning Signs

Check Engine Control Light on a Vehicle Dashboard

If you notice any weird things like unusual noises, changes in driving and performance, or warning lights lit up on the dashboard, do not ignore them. These are often early signs of an issue that should be addressed ASAP before they escalate into larger problems later on. Consult with a mechanic locally or online about these problems and get advice on if they require attention.

When to Ask a Mercedes Mechanic Online

If you have limited time available, or despite putting in real effort on your own, you still can’t get your car to start, consider consulting a Mercedes mechanic online. It delivers expert guidance in just minutes from the comfort of home, and is far less expensive than a tow and diagnosis at the local garage.

Advantages of an Online Mercedes Mechanic

Happy mechanic repairing car looking at camera

Online Mercedes mechanics can review your symptoms, past repair history, and circumstances to provide troubleshooting steps tailored to your situation. With so many Mercedes mechanics available they can help fix nearly any problem, it doesn’t if matter it’s your SLS AMG that’s having issues or a Mercedes SLR-Class won’t start, the online mechanics can help sort anything in no time. And with many household budgets tighter these days, the convenience and affordability of online mechanics help, keep your wallet happy too.

You can explain the issues you’re having, ask Mercedes mechanics unlimited questions, and even submit images and videos so you can show the expert what you mean. You can connect with them via instant messenger or voice chat, whichever you prefer. The Mercedes mechanic will diagnose the issue, advise the top solution for your specific situation, and even walk you through basic maintenance step-by-step.

If you’re seeking reassurance from a certified mechanic before purchasing expensive parts, or just pressed for time – online assistance has real benefits. Give it a try to see firsthand how convenient fixing problems can be.

So feel free to try out our Mercedes repair questions service and see for yourself!

When and How to Get a Local Mercedes Mechanics Help

automobile mobile mechanic

When your Mercedes SLS AMG won’t start, and you are unable to repair it yourself, thinking about how to get your vehicle to the garage can be a nightmare. There are options like roadside services, that come to you and can provide simple fixes to get your car moving enough again, so you can get it to a mechanic garage for proper repairs. You can also use a towing service, but these can be costly, easily into the hundreds of dollars. A much better option is the use of a mobile mechanic, who will come to you at your home, place of work, or by the roadside, and carry out repairs there and then for you, so you can get your SLS AMG started again ASAP.

So if you think a mobile mechanic is the best solution for you, instead of searching on Google something like  “mobile auto mechanics near me“, the best in the USA that also covers most towns is YourMechanicI have personally recommended them to countless people across the country and they always have a great experience.

Reasons I recommend them:

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If you would like to know more, the process to use them is this.

  1. Visit their official website here: YourMechanic
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Conclusion

In short, when your Mercedes SLS AMG won’t start, it can be a total bummer. However, understanding what might be triggering the problems, being able to troubleshoot them, and knowing what actions are required in each case, and where to find help if necessary, will be a huge help. Remember that routine care is key to avoiding most vehicle issues.

Frequently Asked Questions (FAQs) When a Mercedes SLS AMG Won’t Start

Mercedes SLS AMG won’t start but lights come on?

If your Mercedes SLS AMG‘s lights illuminate but it still won’t start, the issue may not be related to the battery. It’s highly possible there is a problem with the engine starter. Investigate if you hear any clicking noises when trying to turn the key. If so, the starter motor is attempting to activate but failing. Have a mechanic check over the starter motor – it may need to be fixed or swapped out.

Mercedes SLS AMG won’t start but has power?

When your Mercedes SLS AMG has power (lights, radio etc work) but fails to start, there may be a fuel delivery problem. Issues like a faulty fuel pump relay could prevent fuel getting to the engine. Without enough fuel, combustion can’t happen and the engine won’t start. Check around the back seat when turning the key – you should hear the fuel pump prime for a few seconds. If not, have a mechanic check the fuel system.

Mercedes SLS AMG won’t start but battery is good?

If your Mercedes SLS AMG‘s battery tests fine and is fully charged, but the car still refuses to start, the underlying cause is likely electrical. Possible issues include a bad ignition switch, broken sensor, or wiring problems. As electrical issues can be tricky, diagnosis by a professional mechanic is best. They can correctly pinpoint the specific electrical fault and have it repaired.

Mercedes SLS AMG won’t start just clicking?

When you turn the key and there’s only a clicking noise but the engine fails to turn over, the most common cause is a faulty starter motor. The click comes from the starter solenoid attempting to activate the starter motor, but the motor itself fails to spin up the engine. As the starter motor needs mechanical repair or replacing, consult with a reliable mechanic to get your Mercedes SLS AMG running again.

What if my Mercedes SLS AMG won’t start up?

First things first, take a deep breath and try to stay calm. Look for any odd noises, flashing lights, or changes in how it runs that could point to the issue. Most likely the culprit is one of the common problems we will talk about here. If you still can’t locate the exact issue, you’ll have to ask for help from a trusted Mercedes mechanic locally or online.

How do I know if my Mercedes SLS AMG won’t start because of the battery?

Clues that your Mercedes’s battery is the issue include, a slow cranking engine, dim front lights, and battery warning symbols lighting up on the dash. You can also make sure the battery terminals are clean, corrosion-free, and tightly fastened. If your battery is exhausted it’s probably best to just replace it completely.

How to prevent my Mercedes SLS AMG from failing to start in the future?

To prevent this hassle from happening again, scheduled servicing is essential. This includes oil changes, inspecting the battery and scrubbing its terminals, replacing the fuel filter when necessary, and getting your Mercedes SLS AMG inspected by a mechanic frequently. Also, make sure to drive the car regularly so the battery stays charged.

Can I consult an online mechanic if my Mercedes SLS AMG fails to start up?

Yes, you can. An online mechanic service like ours can offer instant professional Mercedes mechanic help and recommendations, without you having to leave your residence. If your vehicle fails to start and is immobile in the parking area, this is particularly useful.

How can services like MechanicAnswer.com provide assistance if my Mercedes SLS AMG isn’t starting?

We connect you with certified Mercedes specialists who can offer proposals tailored to your unique situation. You can update them about your auto problems, ask unlimited questions as needed, upload images and videos so you can fully detail the issue. The mechanic will be able to aid, diagnose the issue, and propose the best plan of action and guide you through it.

Interesting Mercedes SLS AMG Facts

Did you know that the Mercedes SLS AMG has gullwing doors that open upwards like a bird spreading its wings? It’s like something out of a futuristic movie! And get this – the car can go from 0 to 60 mph in just 3.5 seconds. That’s faster than it takes to brew a cup of coffee! Plus, the SLS AMG has a top speed of 197 mph, making it one of the fastest cars on the market. But here’s the really mind-blowing part: the car’s body is made of aluminum, which not only makes it super lightweight, but also incredibly strong. It’s like driving a high-powered spaceship on wheels! No wonder you’re itching to get it started and hit the road. Who wouldn’t want to experience the thrill of driving such an extraordinary machine?

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  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic Near You. They will come to you and fix your vehicle at a time that suits you. If there are none near you, you will be redirected to the online mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just £5.
  2. Get help from a Mobile Mechanic. We  recommend Fixter. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper for you, and you may not need an in-person mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic. We recommend YourMechanic. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper, and you may not need an in-person mechanic.

Choose Your Mechanic

1. Chat with A.I. Mechanic (Robot Robby)
  • Free 7-day trial
  • A.I. Mechanic that is trained by our human mechanic writers. As helpful as a human mechanic for expert advice, troubleshooting, and repair guidance.
2. Chat with a Human Mechanic Online
  • Join for just $5, and $39/month. Cancel anytime
  • Real human ASE-certified mechanics available 24/7

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic Near You. They will come to you and fix your vehicle at a time that suits you. If there are none near you, you will be redirected to the online mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just £5.
  2. Get help from a Mobile Mechanic. We  recommend Fixter. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper for you, and you may not need an in-person mechanic.

Which Mechanic Suits You?

  1. Chat with an Online Mechanic to get instant, unlimited help and advice for 1 full week, for just $5.
  2. Get in-person help from a Mobile Mechanic. We recommend YourMechanic. They will come to you and fix your vehicle at a time that suits you. Instant free quote online below. We recommend the online mechanic first, as it’s cheaper, and you may not need an in-person mechanic.

Where Can I Find My VIN?

Your vehicle’s unique Vehicle Identification Number (VIN) can be found on the title document, the vehicle registration, and the insurance policy. It is a series letters and numbers like this as example: WAUGC0896JA235262. The VIN can also be located on the following locations on the vehicle itself:

how to find VIN on vehicle