The Tesla Model S Facelift DRL Issue: Causes and Symptoms

If you drive a facelift Tesla Model S, you already know how much those sleek LED daytime running lights (DRLs) define the car’s futuristic look. But as these vehicles age, a growing number of owners are noticing a frustrating flaw: that crisp, bright white light is starting to fade, change color, or die out completely.

If your Model S is suffering from a tired-looking headlight, you aren’t alone. Here is a breakdown of why this happens, what symptoms to look out for, and how you can fix it without draining your wallet.

Which Tesla Model S Vehicles Are Affected?

This issue specifically targets the facelift Tesla Model S produced between 2016 and early 2021.

When Tesla refreshed the Model S design in 2016, they introduced a modernized headlight assembly featuring a continuous, sweeping LED light strip. While it looked incredible on showroom floors, time and real-world driving conditions have revealed a design vulnerability in these specific units.

The Symptoms: What Does DRL Failure Look Like?

DRL degradation doesn’t always happen overnight. It usually starts subtly before becoming glaringly obvious. Note that while some LED issues involve flickering, this specific Model S defect typically does not involve flickering lights.

Instead, look out for these key symptoms:

• Yellow or Amber Tinting: The most common symptom. Your crisp white DRL begins to develop an ugly, burned-looking yellow or brownish hue, usually starting at the edges or corners.

• Uneven Brightness: The light strip looks dim in some patches and bright in others, losing its seamless appearance.

• Partial Failure: Sections of the DRL strip go completely dark while other parts remain lit.

• Complete DRL Shutdown: The entire daytime running light strip fails to turn on, leaving your front fascia looking asymmetrical and dated.

The Root Causes: Why Do These DRLs Fail?

The underlying cause comes down to physics and component aging. There are three main culprits behind the yellowing and failure:

1. Heat Degradation

LEDs are highly efficient, but they still generate heat. Because the DRL strip is tightly sealed inside the headlight assembly, heat builds up over thousands of hours of operation. Over time, this intense thermal exposure literally bakes the clear acrylic light tubes or the phosphor coating on the LEDs, causing them to degrade and turn yellow.

2. Aging LED Components

Like all electronics, LEDs have a lifespan. As the diodes inside the Model S headlight reach the end of their operational life, their light output drops significantly, leading to a dim, tired appearance.

3. Failure of Internal Electronics

Sometimes the issue isn’t the light itself, but the internal circuitry or driver boards that control power to the DRLs. When these sub-components fail due to heat or moisture, the light strip loses power and shuts down.