2018 BMW 750i Won't Start

Troubleshooting Common Issues That Prevent Your 2018 BMW 750i from Starting and How to Resolve Them

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Reviewed by
Devin Cabugcal
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 2018 BMW 750i 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.
  • Alternator: A failing alternator can result in insufficient electrical power, 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.

What are the initial diagnostic steps to take when a 2018 BMW 750i won't start?

When your 2018 BMW 750i refuses to start, the first step is to check the battery, as a dead or weak battery is a common culprit. If the battery appears low, consider jump-starting the vehicle or testing the voltage with a multimeter. Next, inspect the key fob; a malfunctioning key fob can prevent the car from recognizing the key, so ensure the battery in the fob is functioning properly. Additionally, confirm that the gear selector is in the correct position, either Park or Neutral, as many vehicles have safety features that inhibit starting if the gear is not properly set. If these initial checks do not resolve the issue, using an OBD-II scanner can help identify any error codes that may indicate underlying problems. Also, verify that there is sufficient fuel in the tank, as a low fuel level can sometimes lead to starting difficulties. Lastly, check the engine immobilizer system; if it is engaged, it may prevent the engine from starting. By systematically addressing these areas, you can effectively diagnose and potentially resolve the starting issue with your BMW.

What are the common problems that could cause a 2018 BMW 750i to not start?

When troubleshooting starting issues with a 2018 BMW 750i, it's essential to consider several common problems that could be at play. A weak or dead battery is often the first suspect, as it can stem from age, a faulty battery, or issues within the charging system. If the battery is in good condition, the next component to check is the starter motor, which is responsible for turning the engine over; a malfunction here can prevent the car from starting altogether. Additionally, the fuel system plays a critical role; a clogged fuel filter or a failing fuel pump can hinder fuel delivery, making it difficult for the engine to start. The ignition switch is another potential culprit; if it’s faulty, turning the key may not engage the starting process. Furthermore, worn-out spark plugs can lead to ignition problems, causing the engine to struggle to start. Lastly, issues with the Engine Control Module (ECM) can disrupt various engine functions, leading to starting difficulties. By systematically examining these components, you can effectively diagnose and address the starting issues with your BMW 750i.

How urgent is it to address the starting issue in a 2018 BMW 750i that won't start?

When your 2018 BMW 750i refuses to start, the urgency to address the issue cannot be overstated. Delaying repairs can lead to further complications, such as damage to the battery, starter, or ignition system, which may escalate repair costs significantly. Moreover, a non-starting vehicle can create dangerous situations, especially if it happens unexpectedly while driving, putting both the driver and passengers at risk. Additionally, ignoring the problem can leave you stranded in unsafe or inconvenient locations, making timely intervention essential. By addressing the starting issue promptly, you not only safeguard your vehicle's integrity but also ensure a more accurate diagnosis from a mechanic, leading to a quicker and more effective resolution. Therefore, it is crucial to take immediate action when faced with a starting issue in your BMW 750i to prevent further damage and ensure safety.

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2018 BMW 750i Starting Issues: Troubleshooting Guide