2020 Mazda 3 Won't Start

Common Causes for Your 2020 Mazda 3 Not Starting and How to Resolve Them

Find Repair Location
Reviewed by
Bo Fader
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 2020 Mazda 3 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 for a 2020 Mazda 3 that won't start?

When your 2020 Mazda 3 refuses to start, it's essential to adopt a methodical diagnostic approach to identify the root cause. Begin by checking the battery, as a weak or dead battery is often the most common culprit. Use a multimeter to measure the voltage or attempt a jump-start to see if that resolves the issue. If the battery checks out, turn your attention to the ignition system; ensure the ignition switch is operational and inspect for any loose connections or damaged wiring that could hinder functionality. Next, verify the fuel system by ensuring there’s enough fuel in the tank and listening for the fuel pump's activation when the key is turned to the "on" position. If these initial checks don’t yield results, utilize an OBD-II scanner to look for error codes that can provide valuable insights into potential engine or system malfunctions. Additionally, assess the starter motor to confirm it’s working correctly, as a faulty starter can prevent the engine from turning over. Finally, inspect the spark plugs to ensure they are in good condition and properly connected, as defective spark plugs can also impede the starting process. By following this structured approach, you can effectively narrow down the possible reasons your Mazda 3 won’t start and take the necessary steps to fix the issue.

What are the common problems that could cause a 2020 Mazda 3 to not start?

When your 2020 Mazda 3 refuses to start, it can be frustrating, but understanding the common problems can help you diagnose the issue effectively. One of the first things to check is the battery; a dead or weak battery is often the culprit, especially if you notice dim lights or hear a clicking sound when turning the key. If the battery seems fine, the next step is to inspect the starter motor, as a malfunction here can prevent the engine from cranking. Additionally, consider the fuel system; a clogged fuel filter or a failing fuel pump can hinder fuel delivery, making it impossible for the engine to start. Don't overlook the ignition switch, which can fail and disrupt the starting process, or the spark plugs, which, if worn out, can lead to ignition issues. Lastly, problems within the ignition system, such as a faulty ignition coil, can also contribute to starting difficulties. By systematically checking these components, you can identify the root cause of the problem and take appropriate action, whether that means replacing a part or seeking professional help.

How urgent is it to address the starting issue in a 2020 Mazda 3 that won't start?

When your 2020 Mazda 3 won't start, it is crucial to act swiftly to diagnose and resolve the issue. Delaying attention to a starting problem can lead to more severe complications, such as damage to the battery, starter motor, or ignition system, which can escalate repair costs significantly. Moreover, a vehicle that fails to start unexpectedly can create safety hazards, particularly if it occurs in a precarious situation, leaving you and your passengers vulnerable. Additionally, the inconvenience of a non-starting car can disrupt your daily activities, making it essential to restore your vehicle's functionality as soon as possible. By prioritizing the resolution of starting issues, you not only safeguard your vehicle's integrity but also ensure your safety and maintain the convenience of reliable transportation.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.