Why Do Car LED Headlights Often Show Error Codes and How to Fix Them?

Many drivers upgrade their halogen bulbs to LED headlights for brighter light and longer lifespan. However, after installation, some notice that the dashboard frequently shows an error code, indicating a headlight malfunction—even though the lights work normally. Why does this happen, and how can you solve it?

1. Why Do LED Headlights Trigger Error Codes?

Different Power Consumption

Halogen bulbs typically use 55W, while most LED headlights consume only 20W–40W.

The vehicle’s CANBUS system detects the reduced power and mistakenly assumes the bulb is burned out.

Current Fluctuations

LED headlights draw different current at startup, which can confuse the car’s electronic system.

Sensitive CANBUS Systems

German cars (VW, Audi, BMW, Mercedes, etc.) are known for stricter current and voltage monitoring. Even slight differences may trigger an error.

2. Common Solutions

Use a Decoder/Resistor (CANBUS Decoder)

Adding a decoder to the circuit simulates halogen bulb load, making the system recognize the LEDs as normal.

Pros: Simple, plug-and-play.

Note: Choose high-quality, heat-resistant resistors to avoid overheating issues.

Choose LED Headlights with Built-in CANBUS Decoder

Many premium LED headlights (e.g., CONPEX Smart LED Series) come with an integrated decoder.

Pros: Stable performance, safer, and no extra wiring required.

ECU Reprogramming or System Update

Some high-end vehicles allow disabling bulb detection via software.

Cons: Requires professional service and can be costly.

3. Tips to Prevent Error Codes

Check compatibility before purchase: Different cars have different detection sensitivity.

Choose reliable brands: Branded LEDs offer better current control and anti-interference features.

Ensure proper installation: Avoid reversed polarity or loose connections.

4. Recommended Solution: CONPEX LED Headlights

As a professional automotive lighting brand, CONPEX LED headlights feature advanced CANBUS decoding technology that ensures smooth installation on most vehicles:

✔ Built-in intelligent decoder, no external resistor needed

✔ True plug-and-play design

✔ High brightness with long lifespan

✔ Tested on multiple vehicle models, proven error-free

Upgrade to CONPEX LED headlights for safer driving and say goodbye to annoying dashboard error codes!

Conclusion: Error codes on LED headlights are mainly caused by power and current mismatches with the vehicle’s system. The best solution is to use LED headlights with built-in CANBUS decoding or install a decoder. With the right product, you can enjoy brighter light, longer service life, and error-free performance.