2015 BMW M4 Won't Start

Common Causes for Your 2015 BMW M4 Not Starting and How to Resolve Them

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
38% chance it's the
Battery
0%
27% chance it's the
Alternator
0%
20% chance it's the
Starter
0%
15% chance it's
Something else
The most common reasons a 2015 BMW M4 won't start are a dead battery, an alternator problem, or failed starter.
  • Battery: A weak or failing battery can result in difficulty starting the engine and electrical system malfunctions due to insufficient power supply.
  • Alternator: A failing alternator can result in insufficient electrical power to the vehicle, leading to battery drain and electrical system malfunctions.
  • Starter: A faulty starter motor or a weak battery can prevent the engine from cranking properly, leading to starting issues.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How urgent is it to address the starting issue in a 2015 BMW M4?

Addressing the starting issue in a 2015 BMW M4 is of utmost urgency, as neglecting this problem can lead to serious safety risks and further mechanical complications. A malfunctioning starting system can prevent the engine from receiving the necessary electrical current, which not only hinders the vehicle's ability to start but can also result in more extensive damage if left unaddressed. The longer you wait to inspect and resolve these issues, the greater the risk of a complete breakdown, which could leave you stranded and facing costly repairs. Moreover, a reliable starting system is essential for the overall performance and safety of your vehicle, making it crucial to prioritize timely maintenance and inspections. By addressing these symptoms promptly, you can ensure your BMW M4 remains in optimal condition, avoiding potential inconveniences and enhancing your driving experience.

What are the common problems that could cause a 2015 BMW M4 to not start?

When troubleshooting a 2015 BMW M4 that won't start, it's essential to consider several common problems that could be at play. A dead or weak battery is often the primary culprit, so checking the battery's charge and connections should be your first step. If the battery is functioning properly, the next areas to investigate include the alternator and starter motor, as failures in these components can also lead to starting issues. Additionally, faulty fuel or ignition components, such as spark plugs or fuel injectors, may prevent the engine from firing. It's also wise to examine the crankshaft and camshaft sensors, as their malfunction can disrupt the engine's timing and prevent it from starting. Lastly, don't overlook potential ignition key problems; a faulty key or issues with the electronic chip can hinder the starting process. By systematically checking these components, you can effectively diagnose and resolve the starting issue, getting your BMW M4 back on the road.

What are the steps to diagnose a starting issue in a 2015 BMW M4?

To effectively diagnose a starting issue in your 2015 BMW M4, begin with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Start by examining the battery and electrical system, as these are often the culprits behind starting problems. Ensure the battery is fully charged and inspect all electrical connections for signs of corrosion or damage. Next, turn your attention to the fuel and ignition components; faulty parts in these systems can prevent the engine from starting, so testing their functionality is crucial. Additionally, check the crankshaft and camshaft sensors, as failures in these sensors can disrupt the starting process. If the battery and sensors are in good condition, verify the key and ignition system, since modern BMW keys contain electronic chips that must communicate properly with the vehicle's security system. If these initial checks do not resolve the issue, it may be time to consult a professional mechanic who can conduct advanced diagnostics to identify more complex problems. By following this structured diagnostic approach, you can efficiently pinpoint the cause of the starting issue and take the necessary steps to fix it.

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