2025 Tesla Model Y Bulb Sizes & Lighting Guide

As an ASE-certified master technician, I’ve seen the automotive lighting landscape change dramatically over the last decade. A perfect example of this evolution is the 2025 Tesla Model Y. If you are looking for traditional halogen bulb sizes to upgrade or replace on your Model Y, you might be in for a surprise: Tesla has moved entirely to integrated LED technology.

Whether you are dealing with a burnt-out fog light or a dimming interior light, this guide will help you understand the lighting system of your 2025 Model Y and what your options are for repairs and modifications.

Quick reference: 2025 Tesla Model Y Bulb Sizes

Unlike older vehicles that use standardized bulb sizes (like H11, 9005, or 3157), the 2025 Tesla Model Y utilizes factory-sealed LED assemblies for nearly all external and internal illumination.

Note: The 2025 Model Y comes standard with Matrix LED headlights across most trims, providing advanced beam control. There are no halogen or HID variants.

LED vs Halogen Upgrade Considerations

Because the 2025 Model Y is 100% LED straight from the factory, the traditional conversation about upgrading from halogen to LED doesn't apply. You won't have to worry about CANBUS error decoders, hyper-flashing resistors, or melting wire harnesses from high-wattage halogen bulbs.

However, many Tesla owners still look to customize their lighting. The most common "upgrades" include replacing the interior footwell lights, puddle lights (under the doors), and trunk lights with brighter, aftermarket LED modules. These are usually direct plug-and-play replacements. If you decide to modify exterior lighting (like adding an aftermarket illuminated rear trunk light bar), ensure the product is specifically designed for the Model Y's electrical architecture to avoid triggering errors in the vehicle's low-voltage system.

How to Replace Each Bulb (Assembly)

Since you cannot simply twist out a burnt bulb and replace it, "bulb replacement" on a Model Y actually means replacing the entire lighting housing or module.

• Headlights (Low/High/DRL/Turn): If a headlight fails, the entire front headlight assembly must be replaced. This involves removing the front bumper fascia. Due to the Matrix LED technology, a replacement assembly must be calibrated via the Tesla software menu after installation to ensure proper beam alignment.
• Fog Lights: Similar to the headlights, the fog lights are integrated into the lower bumper housing. Access requires removing the front aero shield and bumper trim.
• Tail Lights / Brake / Rear Turn Signals: The rear lighting is split between the outer quarter panels and the liftgate. Replacing these involves unclipping the interior trunk trim and unbolting the assemblies.
• Interior / Puddle Lights: These are the easiest to service. Simply use a plastic trim removal tool to carefully pry out the factory LED module, unplug the small harness, and plug in the replacement module.

Common Lighting Issues for this Generation

While LED technology boasts a lifespan that often exceeds the life of the car, issues can still arise:

1. Condensation in Taillights: A very common issue on the Model Y. While Tesla notes that minor fogging is normal and should clear up when the lights are on, pooling water inside the lens indicates a failed seal and warrants a warranty replacement.
2. Firmware Glitches: Because the lights are controlled by the car's computer, a software update can sometimes cause erratic behavior (e.g., DRLs not turning on). Usually, a soft reboot of the MCU (holding both scroll wheels) resolves this.
3. Matrix Headlight Regulation: If you are driving a 2025 model, you benefit from Matrix LEDs. However, if the active matrix features aren't behaving properly, the vehicle may require a software push from Tesla or a manual headlight calibration on a level surface.

When dealing with advanced vehicle networks and sealed LED housings, electrical diagnostics can get tricky. If your Tesla is out of warranty or you need a professional to handle a bumper removal for a headlight swap, don't risk damaging the fragile clips or expensive sensors. Find a trusted shop on Repairius.