Aftermarket Headlight & Tail light Hyperflashing Fix

How to Fix LED Turn Signal Hyperflash

What is hyperflash? Your turn signals blink much faster than normal. It often happens after switching halogen bulbs to LEDs (LEDs use less power, so the car “thinks” a bulb is out).

 

Headlight Hyperflash
Headlight Hyperflash
Tailight Turning Light Hyperflash
Taillight Hyperflash
  • Low power draw from LED bulbs confuses the car’s bulb-out check.
  • Overheating protection in some LED bulbs can also trigger fast blinking until the bulb cools.

4 Simple Fixes

  1. Add a load resistor. Puts the electrical load back to near-original so flashing returns to normal.
    Tip: Mount resistors to metal and away from wires—they run hot.
  2. Replace the flasher relay. If your car uses a separate relay, install an LED-compatible one to set the correct flash rate.
    Note: Some cars don’t have a replaceable relay.
  3. Use anti-flash LED bulbs. These have built-in resistors or smart control. If they get too hot, they may reduce power and blink fast again until cooled.
  4. Keep one original bulb connected. Some people keep the stock halogen fog light or turn signal bulb wired in together with the LEDs. This extra load balances the system and can stop hyperflash.

    Downside: The old bulb will still use power and may need space for mounting.

Comparison of 4 Fixes

Method Pros Cons
1. Load Resistor Cheap, works on almost any car Gets very hot, needs safe mounting
2. Flasher Relay Clean install, no extra heat, long-term solution Not all cars have a replaceable relay
3. Anti-flash LED Bulbs Plug-and-play, no extra wiring Can overheat, usually higher cost
4. Keep One Original Bulb Very simple, DIY-friendly Still wastes power, may take extra space

Quick pick guide

  • Fast, universal: Load resistors.
  • Cleaner wiring (if supported): LED-compatible flasher relay.
  • Plug-and-play: Anti-flash LED bulbs.
  • Simple DIY: Keep one original bulb connected.

After any fix, test both sides. Normal rate is usually about 60–120 flashes per minute.

Normal Headlight Turning Light
Normal Headlight Turning Light
Normal Taillight Turning Light
Normal Taillight Turning Light

FAQ

  • Does hyperflash damage my car?
    No. Hyperflash itself doesn’t harm your car. It’s just a warning signal from the system that the power draw is lower than expected (like when a bulb burns out). The only risk comes if resistors are installed poorly and overheat.
  • Can I drive with hyperflashing?
    Yes, your car will still run normally, but it’s not safe. Other drivers may be confused by the fast blink, and it reduces clear communication on the road. It’s best to fix hyperflash as soon as possible.