Mercedes CLS-klasse AMG Wont Start? Here’s Quick Solutions to Most Common Problems

Introduction

As a trained car mechanic with over two decades of hands on experience, I’ve seen plenty of people struggling when their Mercedes CLS-klasse AMG Won’t Start. And let’s be honest, not being able to start your car when you need to drive straight up sucks.

But don’t lose hope, you’ve come to the right place, no need to keep googling searches like “Mercedes wont turn over“, I got you covered. My name’s Robby, a certified auto mechanic with over two decades of experience, and in this article, I’ll explain the most common causes for why your CLS-klasse AMG fails to start. I’ll cover all the typical culprits so you can diagnose what’s causing issues, plus what to do to fix each specific situation. Drawing on my 20 years of personal experience, I’ll supply practical repair advice to get your Mercedes CLS-klasse AMG up and running as soon as possible!

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Why Won’t My a Mercedes Start?

Mercedes CLS-klasse AMG wont start

Before we tackle the laundry list of possible issues and solutions, it’s critical to first get on the same page of the core problem. When you hop in your Mercedes CLS-klasse AMG and realize “it won’t start!”, there could be multiple parts causing the difficulties. Maybe the engine isn’t cranking at all, or possibly it’s turning over partially yet not igniting. Or you might notice clicking sounds when you try to start it, but ultimately nothing happens. All these situations can indicate various mechanical issues.

Common Reasons Why Your Mercedes CLS-klasse AMG Won’t Start

There are a host of culprits as to why your CLS-klasse AMG won’t fire up. Typical causes cover a weak or drained battery, faulty alternator, starter motor failures, fuel system snags, plus electrical or wiring defects. Each of these issues can present differently, needing specific methods of diagnosis and repair to get you back on the open road ASAP. All of which, we’ll delve into.

Symptoms of a Mercedes CLS-klasse AMG That Won’t Start

Spotting these warning signs will guide you toward the core cause. For instance, when you turn the key and you hear it clicking but no ignition, it often indicates a fuel or ignition issue.

Analysis of The Reasons Why Your Mercedes CLS-klasse AMG Won’t Start

The first step in fixing the no-start headache is understanding the precise origin of the issue. So let’s explore the most common explanations for the CLS-klasse AMG failing to start when you turn the key.

Battery Issues in a Mercedes CLS-klasse AMG

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

In the vast majority of situations, the most frequent reason a Mercedes CLS-klasse AMG won’t start comes down to issues with the battery. Specifically, a drained or weak battery prevents the engine from cranking. The car’s battery supplies the required power to ignite the engine and run all your electronics. Signals of a dying battery include labored or difficult cranking, dim headlights, or a battery alert symbol illuminated on the dash. A battery charger can recharge a dead 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 CLS-klasse AMG

car wont start alternator

The Alternator keeps the battery juiced up by harnessing engine power while driving. A malfunctioning alternator can easily prevent your Mercedes CLS-klasse AMG from starting since it cannot recharge the battery, draining it completely so that one day you hop in your beloved Mercedes CLS-klasse AMG and it simply can’t start. Symptoms of a malfunctioning alternator can be an illuminated battery or alternator caution light on the dash, faint headlights while idling, or a grinding noise from the engine while running.

Starter Motor Failures in a Mercedes CLS-klasse AMG

car wont start wont turn over

The starter is crucial for turning the engine when you try and start up your Mercedes. Should the starter fail, the engine might not crank, preventing your CLS-klasse AMG from starting. Listen out for clicking noises when you turn the key or grinding while trying to start, which could indicate starter issues.

Fuel System Issues in a Mercedes CLS-klasse AMG

car wont start fuel filter

We’re not talking about running out of gas like a silly goose. Rather, it’s issues with the fuel system itself potentially leaving your CLS-klasse AMG unable to start. Your car uses gas uses gas to combine with oxygen and powers the engine. Issues in fuel delivery 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 consider a fuel injector cleaner like Red Line to clear any blockages and improve starting.

Electrical System or Wiring Problems in a Mercedes CLS-klasse AMG

car wont start electrical issue
Image Credit: MechanicAnswer.com

Ok, well yes that image is a joke, but I want to emphasize today’s cars depend greatly on electronics, opening up what can go wrong. With older models, the usual suspects include blown fuses, ignition problems, damaged ignition switches, or broken sensors. Electrical issues and electronics like these may prevent your car from starting. Pay attention to your car only starting sometimes, dashboard alerts, or failure to crank as indicators pointing to an underlying electrical issue. Pinpointing and fixing these often needs a qualified mechanic near you.

Solutions: Let’s Get Your Mercedes CLS-klasse AMG Starting Again!

If you think you might know what the issue may be, it’s time to figure out the reason behind your car’s inability to start up, and then the logical next move is to try to repair the issue. Here’s advice for the frequent problems we’ve talked about already:

How to Identify and Fix Battery Issues in a Mercedes CLS-klasse AMG

car not starting but battery is fine

The first step if a battery problem is suspected for the no start is to inspect the battery terminals. Ensure they are corrosion-free, secure, and properly connected. If the terminals are in fact corroded, try scrubbing them with a baking soda and water solution.

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, if the battery has aged or lacks capacity, replacing it will be necessary. Otherwise, even sufficiently charging it to start your CLS-klasse 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 CLS-klasse 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 CLS-klasse AMG

Car wont start replace alternator needed

If you think the alternator is the reason your Mercedes CLS-klasse AMG won’t start, a test can confirm. If you can temporarily get the car running (you may need a jump start), with the engine on, detach the positive battery terminal. It’s probably the alternator if the motor conks out soon after disconnecting the positive lead. Keep in mind though this test can be dangerous and mess up sensitive electronics in your ride, so it’s best to talk to an experienced mechanic locally or online first since this test risks harming the delicate electronics in your auto.

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 CLS-klasse AMG. You find all the information you need about your specific vehicle by searching online for something like “free Mercedes vin owner lookup“, 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 CLS-klasse AMG

starter motor issues in a ford

If you think the starter motor might be causing your Mercedes CLS-klasse AMG to not start up, listen closely for a clicking noise 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 CLS-klasse AMG

clogged fuel filter car wont start

If you suspect a fuel system malfunction 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 make a quiet humming for a few seconds. Should no such quiet hum be audible, the fuel pump could be faulty. Difficult starting, stalling, or lagging acceleration may also stem from a problematic or clogged fuel filter. Both pump and filter issues normally need a professional mechanic to diagnose and fix them properly, often involving fuel pressure testing and specialized diagnostic gear. Later in this article, I detail the best ways to get help from a local Mercedes mechanic near you. 

How to Fix Electrical or Wiring Problems in a Mercedes CLS-klasse AMG

fuses to check when car wont start

If you suspect it’s an wiring problem, first examine the fuses for the ignition system, and swap out any that have blown. If your CLS-klasse 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. Dash lights on the dashboard could additionally mean a faulty sensor. These can be complex problems needing a qualified mechanic to diagnose and fix (see below advice on local mechanics).

How to Prevent Starting Issues in a Mercedes CLS-klasse AMG

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

Routine Maintenance of Your Mercedes CLS-klasse AMG

Regular maintenance on car to prevent starting issues

Routine maintenance is key to avoiding issues, including oil changes, battery checks, cleaning terminals, replacing the fuel filter as needed, and having a mechanic inspect the car regularly. If unsure about maintenance for your model, consult a mechanic locally or online for clarification.

Drive Your CLS-klasse AMG Regularly

drive regular to avoid car troubles

If your Mercedes CLS-klasse AMG happens to sit unmoved in your garage or front yard for weeks without being driven, the battery can decrease as it is not being charged up by the engine running, through the alternator. Try your best to drive your vehicle regularly to keep a charged battery. If you remember you haven’t driven your car in a while, take it for a short drive around town to ensure there is still a charge left.

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

Take Notice Of Warning Signs

Check Engine Control Light on a Vehicle Dashboard

If you notice any weird things like unusual sounds, 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 your living room, and is far less expensive than a tow and diagnosis at the local garage.

Benefits of an Online Mercedes Mechanic

Happy mechanic repairing car looking at camera

By detailing what you’ve already tried and sharing specifics on the no-start issue, online mechanics can then offer a custom action plan to help get your car started again. With so many Mercedes mechanics available they can help fix nearly any problem, it doesn’t if matter it’s your CLS-klasse AMG that’s having issues or a Mercedes CLS-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 upload pics and videos so you can demonstrate to the mechanic what you mean. You can connect with them via instant messenger or voice chat, whatever you like. The Mercedes specialist will ID the problem, recommend the best fix for your particular case, and even guide you on basic maintenance step-by-step.

Whether you want an expert second opinion or are simply short on time, online repairs assistance is there when you need it. Give it a try – you may be surprised just how easy and stress-free it is.

So feel free to try out our ask a Mercedes mechanic live chat service and see for yourself!

When and How to Get a Local Mercedes Mechanics Help

automobile mobile mechanic

When your Mercedes CLS-klasse 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 CLS-klasse AMG started again ASAP.

So if you think a mobile mechanic is the best solution for you, instead of searching on Google something like  “mechanic to come to 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 CLS-klasse AMG doesn’t turn over, it can be a major inconvenience. However, understanding what might be causing the problems, being able to troubleshoot them, and knowing what actions are needed in each case, and where to find help if necessary, will be a huge help. Remember that routine maintenance is vital to avoiding most car problems.

Frequently Asked Questions (FAQs) When a Mercedes CLS-klasse AMG Won’t Start

Mercedes CLS-klasse AMG won’t start but lights turn on?

If your Mercedes CLS-klasse AMG‘s lights turn on 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 starter motor. Investigate if you hear any clicking noises when trying to turn the key. If so, the starter motor is trying to engage but failing. Get a mechanic examine the starter motor – it may need to be fixed or swapped out.

Mercedes CLS-klasse AMG won’t start but has power?

When your Mercedes CLS-klasse AMG has power (lights, radio etc work) but does not start up, there may be a fuel delivery problem. Issues like a faulty fuel pump relay could stop 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, get a mechanic check the fuel system.

Mercedes CLS-klasse AMG won’t start but battery is fine?

If your Mercedes CLS-klasse AMG‘s battery checks out OK 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 CLS-klasse 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 physical fixing or swapping out, consult with a reliable mechanic to get your Mercedes CLS-klasse AMG running again.

What if my Mercedes CLS-klasse AMG won’t start up?

First things first, take a deep breath and don’t panic. 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’ll 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.

Determine if my Mercedes CLS-klasse AMG won’t start because of the battery?

Clues that your Mercedes’s battery is the issue are, a slow cranking engine, dim front lights, and battery alerts lighting up on the dash. Also check that 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 CLS-klasse AMG from failing to start in the future?

To prevent this frustration from repeating, scheduled servicing is vital. This includes oil changes, testing the battery and cleaning its terminals, changing out the fuel filter when needed, and getting your Mercedes CLS-klasse AMG inspected by a mechanic frequently. Additionally, make sure to drive the car frequently so the battery stays charged.

Can I consult an online mechanic if my Mercedes CLS-klasse AMG fails to start up?

Yes, you can. An online mechanic service like ours can offer instant professional Mercedes mechanic aid and recommendations, without you having to leave your residence. This is particularly helpful if your Mercedes CLS-klasse AMG is unable to start and is immobile in the parking area,.

In what ways can platforms like MechanicAnswer.com lend a hand if my Mercedes CLS-klasse AMG fails to start?

We link you with qualified Mercedes mechanics who can offer suggestions particular to your individual situation. You can brief them about your vehicle problems, ask unlimited questions as needed, and even submit videos or pictures so you can fully detail the problem. The mechanic will be capable to aid, identify the problem, and put forward the best solution and guide you through it.

Interesting Mercedes CLS-klasse AMG Facts

Did you know that the Mercedes CLS-klasse AMG has a top speed of 155 mph? That’s faster than most sports cars on the market! And get this – it can go from 0-60 mph in just 4.1 seconds. That’s like lightning speed! Plus, the interior of the CLS-klasse AMG is like a luxurious spaceship, with ambient lighting, premium materials, and a state-of-the-art infotainment system. It’s no wonder you’re itching to get it started and hit the road. But don’t worry, once you get this baby up and running, you’ll be turning heads and leaving everyone in the dust. So hang in there, because the thrill of driving your Mercedes CLS-klasse AMG is just around the corner!

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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