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How To Fix Flickering LED Headlights

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Nothing makes a splendor-looking car turn hideous than a flickering headlight. It is one of those things that you can’t ignore and needs to be fixed right away. Here in this article, you will learn how to fix flickering LED headlights. 

How To Fix Flickering LED Headlights

The flickering of LED could be possible due to various reasons like a defect in the alternator or battery that needs to be replaced. In addition, LED headlights to flicker when moisture finds its way interior of the battery, damaging the circuit board.

Car with its headlights turned on

Causes Of Flickering of LED Headlights

To understand the root cause of the flickering, you have to dig deep and find the possible reasons. However, you can narrow down the issue by checking the following checkpoints instead of pondering where to start searching for the defect.

  • Flickering of light after ignition
  • Voltage fluctuation
  • Unsteady AC power supply

The causes of the flickering headlight are:

  • Unsteady electric supply from the car
  • Problem with CAN-bus system
  • Failed communication between car’s computer system and headlight’s electrical system
  • Loose connection: check if the light flicker when you drive

How To Know The Flickering Headlight Could Be Fixed?

LED bulbs are energy-efficient and last longer than their predecessors, like halogen headlamps. As a result, a flicker of the headlight can be noticed easily when you turn in or off the ignition.

  • Make sure it is not a loose connection that is giving you all the trouble.
  • Check the connection of supply to make sure the voltage is constant.
  • Remove the headlight cover and check for any damage from the exterior.

Materials Required

You’ll likely have most of these car tools and accessories in your garage already, especially if you regularly inspect and fix up your car.

  • Multimeter
  • Voltage Tester
  • Wire Strippers
  • Screwdrivers and Nut drivers
  • Pliers
  • Torch
  • Utility Knife
  • Bulb Tester
  • Rubber gloves

Step 1: Check The Faults

This is the preventive step. Doing it will save time and will make sure that unknowingly you won’t overlook anything.

Close up of a car's headlights
  • Turn off the power of the car and remove the headlight cover from the headlamps.
  • Next, check the wires for damage. If the wires are overstressed or not connected properly, then you need to work on that.
  • To check the wiring connection or voltage fluctuation, use a voltmeter. If any reading comes when you touch one probe to the battery and the other to the terminal, it shows the circuit has corrosion or overstressed wiring.
  • After you check the fault of the wirings, check the battery of the car. When the battery is at the end of its lifecycle, it can’t provide the required amount of power to the lights, hence, causes flickering.

These steps will ensure that no external factors are influencing the flickering of light.

Step 2: Check The Wire Fusing Panel

Once you check the possible faults from the outside, look at the fuse box to check if all the flickering is due to a bad fuse.

  • Open the bonnet of the car and secure it with the windshield.
  • Look for the fuse box and open the box by compressing it from two sides and pulling it out.
  • In the fuse box, you can see the labeled headlight fuse, pull it out with the pliers and check for any breakage.
  • Check for corrosion, loose wire connection, and damage to the fuse. Check the fuse with the bulb tester.
  • If it is damaged, then replace it with a new one.

Check whether it has stopped flickering; if not, then move ahead to the next step.

Step 3: Use LED Decoder

If the light still flickers, this is an effective method to stop it from flickering. In addition, the LED decoder can store electric current and release it stably, ensuring the stable and consistent current is supplied.

  • To install the LED decoder, first, take out the assembly of the headlight cover. It is easy to open with the help of a screwdriver.
  • Open the screws at the two ends of the assembly, remove the assembly by pulling it in the car’s front, and then slowly lifting it upwards.
  • Unplug the wire connection by pushing down on the locking tab and pulling it apart.
  • You will find the factory connector, and the decoder has to be installed between the factory connector and the bulb.
  • The decoder has two ends; one goes into the factory harness and connects to the bulb.
  • After connecting, push all the wires back into the fixed place and cover it with the dust cover. Reassemble the assembly in the same procedure it was opened.
Car with flickering headlights

Repeat the same procedure on the other headlight, and you are good to go. This fixes the power issue with the headlights and stops them from flickering. Here is a video guide to follow.

Step 4: Anti-flicker Adapters

If the light is flickering, check for the communication between the car’s computer system and the electrical system; then, you may need anti-flickering adapters.

  • Put out the headlights from the car, then take the anti-flickering light and install it with the in-line headlight harness.
  • Take a screwdriver and install the adapter and tuck it all in behind the headlight.
  • The anti-flickering acts as a translator between the car’s computer system and the electrical system. It resolves the communication issue, hence stops the flickering of LED headlights.

The installation of anti-flickering is hassle-free, and this tiny gadget even works to resolve wiring issues in the car.

Frequently Asked Questions

How to Fix Dim LED Headlights?

The procedure is simple, clean the ground connection of the bulb, and it will fix the problem. If only one headlight is dim, then you need to replace the bulb of the headlight.

Do LED Headlights Flicker When They Burn Out?

No, when the LED headlight burns out, it dims slowly. This is because the brightness of the bulb reduces over time. If the headlight is dimming out while flickering, then it has burned out. Consider replacing with a new one.


Flickering headlights are a sign of trouble, and this is a serious car problem that should be fixed without delay. But, first, diagnose the issue and then move on to the tips and steps shared in this article.

Once you know the root cause of the problem, you can easily fix it at home, depending on your mechanical skills. However, if you are not proficient with technical skills, we recommend you get it fixed at an auto mechanic shop.