BMW M4 Wont Start? Here’s Quick Solutions to Most Common Problems

Introduction

As a trained mechanic with over two decades of hands on experience, I’ve helped plenty of people struggling when their BMW M4 Won’t Start. And I’ll be straight with you, not being able to start your car when you need to drive straight up sucks.

But keep your chin up, you’ve come to the right place, no need to keep googling searches like “BMW wont start because of alarm“, I got you covered. My name’s Robby, a certified auto mechanic with over two decades of experience, and in this guide, I’ll walk you through the most common explanations for why your M4 refuses to start. I’ll cover all the commonplace offenders so you can identify what’s going on, plus what to do to fix each particular problem. Drawing on my 20 years of personal experience, I’ll provide actionable repair advice to get your BMW M4 up and moving ASAP!

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Why Won’t My a BMW Start?

BMW M4 wont start

Before we tackle the list of possible faults and fixes, it’s key to first get on the same page of the core problem. When you climb into your BMW M4 and discover “it won’t start!”, there could be several parts causing the difficulties. Maybe the engine isn’t cranking at all, or maybe it’s cranking but not firing. 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 BMW M4 Won’t Start

There are numerous reasons why your M4 won’t turn on. The usual suspects cover a weak or drained battery, defective alternator, starter motor complications, fuel system problems, plus electrical or wiring issues. Each of these concerns can present differently, requiring 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 BMW M4 That Won’t Start

Recognizing these red flags will lead you to the main issue. For instance, when you turn the key and you hear it turning over yet no start up, it often signifies a problem with either fuel delivery or ignition issues.

Analysis of The Reasons Why Your BMW M4 Won’t Start

The initial move in remedying the no-start nuisance is understanding the specific origin of the problem. So let’s explore the most frequent explanations for the M4 refusing to start when you turn the key.

Battery Issues in a BMW M4

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

In the majority of cases, the most common reason a BMW M4 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. Symptoms of a struggling battery entail labored or difficult cranking, dim headlights, or a battery alert symbol 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 BMW M4

car wont start alternator

The Alternator keeps the battery juiced up by harnessing engine power while driving. A busted alternator can easily stop your BMW M4 from starting since it fails to recharge the battery, draining it completely so that one day you hop in your beloved BMW M4 and it just can’t start. Symptoms of a faulty alternator can be an illuminated battery or alternator warning symbol on its dashboard, dim headlights while idling, or a grinding noise from the engine while running.

Starter Motor Failures in a BMW M4

car wont start wont turn over

The starter motor is key to cranking the engine when you go to start up your BMW. If the starter is faulty, the engine might not crank, preventing your M4 from starting. Listen for clicking noises when you turn the key or grinding while trying to start, which could indicate starter problems.

Fuel System Issues in a BMW M4

car wont start fuel filter

This isn’t about running out of gas like a silly goose. Rather, it’s problems in the fuel system itself potentially leaving your M4 unable to start up. Your car uses gas uses gas to mix with air and powers the engine. Issues in fuel delivery like a clogged fuel filter or failing fuel pump relay may mean the engine lacking the fuel it needs to start. 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 BMW M4

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. Even in older BMW’s, the usual suspects include blown fuses, ignition problems, faulty ignition switches, or non-working sensors. Faulty wiring and electronics like these may prevent your BMW M4 from starting. Be on the lookout for your car only starting sometimes, dashboard alerts, or failure to crank as indicators pointing to an underlying electrical issue. Diagnosing and repairing these typically requires a knowledgeable mechanic near you.

Solutions: Let’s Get Your BMW M4 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 next step is to attempt to mend the problem. Here are some tips for frequent problems we’ve covered thus far:

How to Identify and Fix Battery Issues in a BMW M4

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 M4 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 BMW 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 M4’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 BMW M4

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 auto running (you may need a jump start), and while the engine is running, disconnect the positive terminal of your car’s battery. It’s probably the alternator if the engine conks out soon after disconnecting the positive lead. However, be warned this test can be risky and damage sensitive electronics in your wheels, so seeking advice from a qualified mechanic in your area or online is best prior to 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 BMW M4. You find all the information you need about your specific vehicle by searching online for something like “BMW specs by VIN 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 BMW M4

starter motor issues in a ford

If you suspect the starter motor is the culprit behind your BMW struggling to start, keep an ear out for a clicking sound when you turn the key. If present, but the engine does not turn over, the starter motor likely requires replacement. 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 BMW M4

clogged fuel filter car wont start

If you think a fuel system issue might be causing 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 you can’t hear that noise, the fuel pump could be defective. Problematic starting, stalling, or poor throttle response may also result from a blocked fuel filter. Both pump and filter issues usually need a professional mechanic to diagnose and fix them properly, often using fuel pressure testing and specialized diagnostic equipment. Later in this article, I detail the best ways to get help from a local BMW mechanic near you. 

How to Fix Electrical or Wiring Problems in a BMW M4

fuses to check when car wont start

If you suspect it’s an electrical problem, first inspect the fuses for the ignition system, and replace any that have blown. If your M4 starts after this, it was an effective, cheap repair! 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 damaged component. These can be complex issues needing a professional mechanic to identify and fix (see below advice on local mechanics).

How to Prevent Starting Issues in a BMW M4

As my dad would say: “An ounce of prevention is worth a pound of cure”. Here’s how to avoid future problems starting your M4:

Routine Maintenance of Your BMW M4

Regular maintenance on car to prevent starting issues

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

Drive Your M4 Regularly

drive regular to avoid car troubles

If your BMW M4 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 BMW M4 regularly to maintain a charged battery. If you remember you have not driven your car in a while, take it for a quick drive 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 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 BMW Mechanic Online

If your schedule is packed, or you gave fixing the no start yourself an honest effort but with no luck, consider consulting a BMW mechanic online. It delivers quick professional advice from the comfort of your living room, and is far less expensive than a tow and diagnosis at the local garage.

Advantages of an Online BMW 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 BMW mechanics available they can help fix nearly any problem, it doesn’t if matter it’s your M4 that’s having issues or a BMW M3 wont 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 describe the issues you’re having, ask BMW mechanics unlimited questions, and even upload pics and videos so you can demonstrate to the expert what you mean. You can chat with them via instant messenger or voice chat, whatever you like. The BMW specialist will diagnose the problem, advise the best fix for your specific situation, and even guide you on simple repairs 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 BMW mechanic online chat service and see for yourself!

When and How to Get a Local BMW Mechanics Help

automobile mobile mechanic

When your BMW M4 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 M4 started again ASAP.

So if you think a mobile mechanic is the best solution for you, instead of searching on Google something like  “auto mechanic near my location“, 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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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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Super easy, super reliable, super convenient, and highly recommended.

Conclusion

In short, when your BMW M4 doesn’t turn over, it can be a total bummer. However, understanding what might be triggering the issues, being able to troubleshoot them, and knowing what actions are needed in each case, and where to get help if needed, will be a huge help. Remember that routine maintenance is key to avoiding most vehicle problems.

Frequently Asked Questions (FAQs) When a BMW M4 Won’t Start

BMW M4 won’t start but lights come on?

If your BMW M4‘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 starter motor. Investigate 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 inspect the starter motor – it may need to be repaired or replaced.

BMW M4 won’t start but has power?

When your BMW M4 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 cranking the key – you should hear the fuel pump prime for a few seconds. If not, have a mechanic check the fuel system.

BMW M4 won’t start but battery is good?

If your BMW M4‘s battery checks out OK and is fully charged, but the car still refuses to start, the underlying cause is likely electrical. Potential culprits 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.

BMW M4 won’t start just clicking?

When you turn the key and just hear clicking 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 BMW M4 running again.

What if my BMW M4 won’t start up?

First things first, take a deep breath and don’t panic. Check 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’ll talk about here. If you still can’t identify the exact issue, you’ll have to consult a trusted BMW mechanic locally or online.

How do I know if my BMW M4 won’t start because of the battery?

Clues that your BMW’s battery is the issue include, a slow cranking engine, dim front lights, and battery warning symbols 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 completely.

How to prevent my BMW M4 from failing to start in the future?

To prevent this nuisance from repeating, routine upkeep is vital. This includes oil changes, inspecting the battery and scrubbing its terminals, changing out the fuel filter when needed, and getting your BMW M4 inspected by a mechanic frequently. Also, be diligent about drive the car regularly so the battery stays charged.

Can I consult an online mechanic if my BMW M4 fails to start up?

Yes, you can. An online mechanic service like ours can offer instant expert BMW mechanic aid and recommendations, without you having to leave your home. This is especially helpful if your BMW M4 is unable to start and is immobile in the parking area,.

In what ways can websites like MechanicAnswer.com be of service if my BMW M4 fails to start?

We link you with qualified BMW specialists who can provide recommendations specific to your individual predicament. You can brief them about your vehicle troubles, ask as many questions as needed, and even submit videos or pictures so you can show in detail the problem. The mechanic will be capable to assist, diagnose the fault, and put forward the best remedy and walk you through it.

Interesting BMW M4 Facts

Did you know that the BMW M4 has a top speed of 155 mph? That’s faster than a cheetah! And get this – it can go from 0 to 60 mph in just 3.8 seconds. That’s like being shot out of a cannon! Plus, the M4 comes with a carbon-fiber roof, which not only looks super cool but also helps to lower the car’s center of gravity for better handling. And if you’re a fan of the sound of a powerful engine, you’ll love the M4’s signature quad exhaust pipes, which make it sound like a beast on the prowl. With all these impressive stats and features, it’s no wonder the BMW M4 is a dream car for so many people.

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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