Mercedes B-Class Wont Start? Here’s Quick Solutions to Most Common Problems

Intro

As a skilled auto mechanic with over 20 years of hands on experience, I’ve helped plenty of people struggling when their Mercedes B-Class Won’t Start. And let’s face it, 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 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 B-Class refuses to start. I’ll cover all the commonplace suspects so you can diagnose what’s causing issues, plus what to do to fix each specific situation. Drawing on my two decades of training and on the job experience, I’ll provide actionable repair advice to get your Mercedes B-Class fire up and moving as soon as possible!

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Why Won’t My a Mercedes Start?

Mercedes B-Class wont start

Before we tackle the list of possible faults and fixes, it’s vital to first get on the same page of the central issue. When you climb into your Mercedes B-Class and discover “it won’t start!”, there could be several components causing the headaches. Perhaps the engine doesn’t turn over whatsoever, 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. Each scenario can signal various problems under the hood.

Common Reasons Why Your Mercedes B-Class Won’t Start

There are a host of reasons why your B-Class won’t start. The usual suspects cover a dead or weak battery, broken alternator, starter motor failures, fuel system snags, plus electrical or wiring malfunctions. Each of these issues can present differently, requiring specific methods of troubleshooting and fixing to get you driving again ASAP. All of which, we’ll delve into.

Symptoms of a Mercedes B-Class That Won’t Start

Spotting these red flags will help uncover the core issue. Take for example, when you turn the key or press the start button and you hear it clicking but no ignition, it often signifies a fuel or ignition issue.

Analysis of The Reasons Why Your Mercedes B-Class Won’t Start

The initial move in remedying the no-start nuisance is pinpointing the specific source of the trouble. So let’s explore the most common causes of the B-Class failing to start when you turn the key.

Battery Issues in a Mercedes B-Class

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

In the majority of cases, the most frequent reason a Mercedes B-Class won’t start comes down to issues with the battery. Specifically, a weak or dead battery prevents the engine from cranking. The car’s battery provides the necessary electrical juice to ignite the engine and activate all your vehicle’s electrical components. Signals of a struggling battery entail sluggish or strained cranking, faint headlights, or a warning light aglow 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 B-Class

car wont start alternator

The Alternator keeps the battery charged by using engine power while driving. A broken alternator can easily stop your Mercedes B-Class from starting since it fails to recharge the battery, depleting it completely so that one day you climb into your ride and it simply can’t start. Clues of a malfunctioning alternator may include a lit up battery or alternator warning symbol on your dashboard, faint headlights while idling, or a whirring noise from the engine while running.

Starter Motor Failures in a Mercedes B-Class

car wont start wont turn over

The starter motor is key to turning the engine when you attempt to start your Mercedes. If the starter is faulty, the engine might not crank, keeping your B-Class from starting. Listen for clicking sounds when you turn the key or grinding while trying to start, potentially signaling starter troubles.

Fuel System Issues in a Mercedes B-Class

car wont start fuel filter

We’re not talking about running out of gas like a silly goose. Rather, it’s problems in the fuel system itself potentially leaving your B-Class unable to drive. Your Mercedes B-Class uses gas to combine with oxygen and powers 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 requires for ignition. Fuel injectors can also get clogged over time, so try a fuel injector cleaner like Red Line to clean them out and improve starting.

Electrical System or Wiring Problems in a Mercedes B-Class

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 the number of things that can go wrong. Even in older models, the usual suspects include blown fuses, spark issues, faulty ignition switches, or non-working sensors. Electrical issues and electronics like these can all prevent your car from starting. Be on the lookout for your car only starting sometimes, warning lights, or failure to crank as indicators pointing to an underlying electrical issue. Pinpointing and fixing these often needs a skilled mechanic near you.

Solutions: Let’s Get Your Mercedes B-Class 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 are some tips for common problems we’ve talked about already:

How to Identify and Fix Battery Issues in a Mercedes B-Class

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. Make sure they are corrosion-free, tight, and properly connected. Should you find corrosion on the terminals, a baking soda and water solution can help clean them.

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 B-Class may only provide temporary relief before it runs out of charge again in the near future. 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 B-Class’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 B-Class

Car wont start replace alternator needed

If you suspect the alternator is causing your ride to have issues starting, you can test it yourself. If you can temporarily get the car running (you may need a jump start), and while the engine is running, disconnect the positive terminal of your car’s battery. If the car dies fairly quickly after that, it’s likely a bad alternator. However, be careful this test can be dicey and mess up sensitive electronics in your ride, so seeking advice from a skilled mechanic in your area or online is best before trying it.

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

starter motor issues in a ford

If you think the starter motor is the reason behind your Mercedes not starting, keep an ear out for a clicking sound when you turn the key. If heard, 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 B-Class

clogged fuel filter car wont start

If you suspect a fuel system issue might be causing the no-start, listen closely for the fuel pump hum when you turn the key to “on” before attempting to start the car. The pump should emit a quiet humming for a few seconds. If you can’t hear that noise, the fuel pump could be faulty. Difficult starting, stalling, or lagging acceleration may also result from a problematic or clogged fuel filter. Filter and pump issues usually need a professional mechanic to inspect and repair them properly, often involving fuel pressure testing and specialized diagnostic equipment. 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 Issues in a Mercedes B-Class

fuses to check when car wont start

If you think it’s an electrical issue, first check the fuses for the ignition system, and swap out any that have blown. If your B-Class starts after this, it was a successful, cheap fix! However, if it still won’t start, even sometimes, the ignition switch itself could be problematic. Dash lights on the dashboard could also mean a faulty component. These can be complex issues needing a qualified mechanic to diagnose and properly repair (see below advice on local mechanics).

How to Prevent Starting Issues in a Mercedes B-Class

As grandfather used to say: “An ounce of prevention is worth a pound of cure”. Here’s how to avoid future issues starting your B-Class:

Routine Maintenance of Your Mercedes B-Class

Regular maintenance on car to prevent starting issues

Routine maintenance is critical to avoiding issues, including oil changes, checking the battery, cleaning terminals, replacing the fuel filter as needed, and having a mechanic check over the car routinely. If confused about maintenance for your model, ask a mechanic locally or online for guidance.

Drive Your B-Class Frequently

drive regular to avoid car troubles

If your Mercedes B-Class happens to sit motionless in your garage or driveway for extended times 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 use your Mercedes B-Class regularly to keep 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 fully 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 abnormal 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

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 B-Class that’s having issues or a Mercedes AMG GT won’t start, the online mechanics can help sort anything in no time. And with many household budgets tighter these days, an online mechanic provides instant affordable help when you need it most, 24/7.

You can explain the issues you’re having, ask Mercedes mechanics unlimited questions, and even submit photos and videos so you can demonstrate to the mechanic what you mean. You can connect with them via online chat or phone call, whatever you like. The Mercedes mechanic will diagnose the problem, recommend the best fix for your specific situation, and even walk you through basic repairs 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 – you may be surprised just how easy and stress-free it is.

So feel free to try out our online Mercedes mechanic help service and see for yourself!

When and How to Get a Local Mercedes Mechanics Help

automobile mobile mechanic

When your Mercedes B-Class 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 B-Class 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 repair 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:

  • They use experienced ASE-certified mechanics
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  • Low Cost compared to regular garages

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

  1. Visit their official website here: YourMechanic
  2. Get an instant free quote for what you need
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Conclusion

In short, when your Mercedes B-Class won’t start, it can be a total bummer. However, understanding what might be triggering the issues, being able to diagnose them, and knowing what steps are required in each case, and where to get help if necessary, will be a huge help. Remember that routine maintenance is vital to preventing most car problems.

Frequently Asked Questions (FAQs) When a Mercedes B-Class Won’t Start

Mercedes B-Class won’t start but lights turn on?

If your Mercedes B-Class‘s lights illuminate but it still won’t start, the issue may not be related to the battery. More than likely there is a problem with the engine starter. Check to see if you hear any clicking sounds when attempting to crank the key. If so, the starter motor is trying to engage but failing. Get a mechanic check over the starter motor – it may need to be repaired or replaced.

Mercedes B-Class won’t start but has power?

When your Mercedes B-Class 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 prevent fuel getting to the engine. Without enough fuel, combustion can’t happen and the engine won’t start. Listen near 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 B-Class won’t start but battery is fine?

If your Mercedes B-Class‘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 accurately identify the specific electrical fault and have it repaired.

Mercedes B-Class 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 crank the engine. As the starter motor needs physical fixing or swapping out, seek help from a reliable mechanic to get your Mercedes B-Class running again.

What if my Mercedes B-Class 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. Chances are the culprit is one of the common problems we will talk about here. If you still can’t identify 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 B-Class won’t start because of the battery?

Signs that your Mercedes’s battery is the issue include, 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 older it’s probably best to just replace it entirely.

How to prevent my Mercedes B-Class from failing to start in the future?

To prevent this hassle from repeating, regular upkeep is crucial. This includes oil changes, testing the battery and scrubbing its terminals, replacing the fuel filter when necessary, and getting your Mercedes B-Class checked out by a mechanic on a regular basis. Also, be diligent about drive the car often so the battery stays charged.

Can I consult an online mechanic if my Mercedes B-Class fails to start up?

Yes, you can. An online mechanic service like ours can offer instant expert Mercedes mechanic assistance and advice, without you having to leave your home. This is particularly beneficial if your Mercedes B-Class is unable to start and is immobile in the driveway,.

How can websites like MechanicAnswer.com be of service if my Mercedes B-Class won’t turn on?

We connect you with licensed Mercedes technicians who can provide recommendations tailored to your unique predicament. You can update them about your vehicle problems, ask as many questions as needed, upload images and videos so you can comprehensively demonstrate the problem. The specialist auto mechanic will be capable to help, identify the problem, and put forward the ideal solution and walk you through it.

Interesting Mercedes B-Class Facts

Did you know that the Mercedes B-Class is actually a compact multi-purpose vehicle (MPV) designed to combine the functionality of a hatchback with the luxury and performance of a Mercedes-Benz? It’s like the Swiss Army knife of cars! And get this – the B-Class is available in both gasoline and electric versions, making it a versatile choice for eco-conscious drivers. Plus, with its spacious interior and advanced safety features, it’s the perfect vehicle for families on the go. Oh, and did I mention that the B-Class also comes with the latest in-car technology, including a user-friendly infotainment system and driver assistance features? It’s like driving into the future! No wonder you’re itching to get back behind the wheel of your B-Class.

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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