Lights

LED headlight or taillight isn't working

LED lights fail differently than traditional bulbs, often needing the whole LED module or driver replaced rather than a simple bulb swap, since LEDs rarely burn out individually.

Difficulty
Intermediate
Time
30–90 minutes to diagnose
DIY cost
$50–$300
Pro cost
$200–$800

Symptoms

  • LED headlight or taillight segment is completely dark
  • Part of an LED light strip works while another section doesn't
  • Light flickers or pulses instead of staying steady
  • No change even after checking fuses

Likely causes

  • CommonFailed LED driver or control moduleLED lights use a small driver circuit to regulate power, and this can fail even if the LEDs themselves are fine.
  • CommonConnector or wiring issue specific to the LED unitLED assemblies are sensitive to connection issues that can cause partial or full failure.
  • PossibleWater intrusion damaging the LED circuit boardLED units have exposed circuitry that can be damaged by moisture more easily than a simple bulb.
  • PossibleManufacturing defect in an individual LED segmentOccasionally a single LED within a strip fails, taking out just that segment.

What to do

  1. Check the fuse box first for a blown fuse related to that light, even though LED failures are often not fuse related.
  2. Inspect the connector at the back of the light assembly for looseness or corrosion.
  3. Look for any visible moisture inside the housing, which can indicate water damage to the LED circuit.
  4. Note whether the whole light is out or just a segment, which helps determine if it's the driver or an individual LED.
  5. Avoid attempting to repair the LED circuit board yourself unless experienced with electronics repair.
  6. Check if your vehicle's LED headlight/taillight is sold as a full assembly or if individual driver modules are available separately.
  7. Have a shop diagnose whether the issue is the driver module, wiring, or the LED board itself.
  8. Replace the affected assembly or module as identified, since LED repairs are less DIY-friendly than traditional bulbs.

Tools and parts

  • Fuse puller or pliers
  • Flashlight
LED headlight/taillight assembly or driver moduleSearch: “LED headlight assembly for [your car make model year]”

When to call a pro

LED lighting systems are often not repairable at the individual bulb level; a shop can confirm whether the whole assembly needs replacing.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.