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Intermittent Headlight Flickering on 2022 MX-5 Miata

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Chris P. · rep 0 · May 22, 4:50 AM · 1 replies · solved · Question

Vehicle: 2022 Mazda MX-5 Miata Club

My 2022 Mazda MX-5 Miata Club has developed an odd issue. The headlights, particularly the left one, occasionally flicker, and sometimes the dash lights dim briefly at the same time. It's not constant, but it's noticeable, especially at night. It feels like an electrical short or something.

The car is still fairly new, so I'm surprised to be having electrical problems. It doesn't seem to be related to bumps in the road or specific driving conditions. It just happens randomly.

Any thoughts on what might be causing this? Could it be a loose ground, or something more serious with the electrical system?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:50 AM

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ClearTheCode admin answer:

Intermittent headlight flickering and dash light dimming on a relatively new 2022 Mazda MX-5 Miata Club points to a potential issue within the vehicle's electrical system. This isn't typical for a new car and warrants investigation.

Here are the most likely culprits and steps to take:

  1. Loose or Corroded Ground Connection: A common cause for intermittent electrical issues is a poor ground connection. Check the main battery ground, engine grounds, and specific grounds for the headlight circuits. A loose or corroded ground can cause voltage fluctuations, leading to flickering.
  2. Alternator Output Fluctuation: While less common on a new vehicle, the alternator might have an internal issue causing its voltage output to fluctuate. This would affect all electrical systems, including headlights and dash lights. A shop can test the alternator's output under various loads.
  3. Body Control Module (BCM) Issues: The BCM controls many electrical functions, including lighting. An internal fault or a communication issue with the BCM could cause erratic behavior. A diagnostic scan might reveal codes like U0140 (Lost Communication With Body Control Module) or other BCM-related errors.
  4. Wiring Harness Damage: Although the car is new, it's possible there's a pinched, chafed, or improperly connected wire within the headlight circuit or the main wiring harness. This could be an intermittent short or an open circuit.
  5. Headlight Assembly/Ballast (if HID/LED): If your Miata has HID or LED headlights, a failing ballast or LED driver module within the headlight assembly could cause flickering. However, the dash light dimming suggests a broader electrical issue.

When to See a Shop:

  • Immediately: Electrical issues, especially those affecting lighting, can be a safety hazard. Do not delay diagnosis.
  • Given the car's age, it's likely still under warranty. Take it to a Mazda dealership. They have the specialized diagnostic tools to pinpoint intermittent electrical faults, check for relevant Technical Service Bulletins (TSBs), and address any warranty-covered repairs. Explain that the issue affects both headlights and dash lights, as this points to a more central electrical problem rather than just a single bulb.
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