What is the low beam headlight bulb size for a 2003 Chevrolet Avalanche?

The 2003 Chevrolet Avalanche uses a 9006 LED bulb for the low beam headlights. We recommend upgrading to LED for better visibility.

What is the high beam headlight bulb size for a 2003 Chevrolet Avalanche?

The high beam bulb size for the 2003 Chevrolet Avalanche is 9011 LED.

Why are my 2003 Chevrolet Avalanche headlights dim?

Dim headlights on a 2003 Chevrolet Avalanche can be caused by aging halogen bulbs, which lose brightness over time, or oxidation (cloudiness) on the plastic headlight lenses. Upgrading to a 9006 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 2003 Chevrolet Avalanche fog light?

The 2003 Chevrolet Avalanche uses a 9145 LED bulb for the fog light position.

Is the 2003 Chevrolet Avalanche single or dual beam?

The 2003 Chevrolet Avalanche uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2003 Chevrolet Avalanche?

Yes, the 2003 Chevrolet Avalanche comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a 9006 LED LED conversion kit for the low beams.

Does the 2003 Chevrolet Avalanche have fog lights?

Yes, the 2003 Chevrolet Avalanche takes a 9145 LED bulb for the fog light position.

How do I change the headlight on a 2003 Chevrolet Avalanche?

Turn off the vehicle and open the hood. Locate the headlight assembly from behind, remove the dust cover or retaining clip, disconnect the wiring harness, twist the old 9006 LED bulb counter-clockwise to remove it, then insert the new bulb and reassemble. The whole process typically takes 10 to 30 minutes per side depending on accessibility.

Are LED headlights legal for a 2003 Chevrolet Avalanche?

LED bulbs used off-road or in auxiliary lights are legal everywhere. For on-road headlight use, legality varies by state. Many states allow LED retrofits as long as the beam pattern meets DOT standards. For the best legal compliance, choose a DOT-approved 9006 LED LED kit that is designed as a direct replacement and produces a proper cutoff pattern without excessive glare.

How much does it cost to replace 2003 Chevrolet Avalanche headlights?

A pair of halogen 9006 LED bulbs costs $15 to $40, while LED conversion kits run $25 to $60 per pair. If you have a shop do the work, expect an additional $20 to $50 in labor per bulb. Replacing them yourself at home saves the labor cost and usually takes under 30 minutes.

What is the difference between halogen and LED for a 2003 Chevrolet Avalanche?

Halogen bulbs produce a warm yellow light (around 3200K), last 500 to 1000 hours, and draw more power. LED bulbs emit a brighter white light (5000-6000K), last 25,000+ hours, and use less energy. LED upgrades for the 9006 LED position are available as direct plug-and-play replacements.

Fitment Guaranteed for 2003 Chevrolet Avalanche

What Size Bulbs Does a 2003 Chevrolet Avalanche Use?

Correct headlight, fog light, and tail light bulb sizes. Sourced from OEM catalog data.

Installation Difficulty

Easy (Plug and Play)

Est. Replacement Cost

$15 - $40 (Halogen) / $30+ (LED)

What Lighting System Does the 2003 Chevrolet Avalanche Have?

Lighting on the 2003 Chevrolet Avalanche is managed by a total of 13 bulbs, covering everything from primary headlights to signal indicators. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate 9006 LED low beam and 9011 LED high beam bulbs for precise light distribution. This model belongs to the early years of the Avalanche's 2002-2011 production span.

Can You Put LED Bulbs in a 2003 Chevrolet Avalanche?

For a Chevrolet built for the road and trail, LED upgrades provide the high-contrast lighting needed for better obstacle detection. We recommend starting your upgrade with the 9006 LED low beams, as they see the most use. Adding a matching 9011 LED LED kit later will complete the look and ensure consistent lighting performance. Don't forget the 9145 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2003 Chevrolet Avalanche Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9006 LED	Buy 9006 LED →
High Beam	9011 LED	Buy 9011 LED →
Fog Light	9145 LED	Buy 9145 LED →
Brake Light	LED Bulb	Buy LED Bulb →
Side Marker	194 LED	Buy 194 LED →
Turn Signal Front	4157K LED	Buy 4157K LED →
Turn Signal Rear	3157K LED	Buy 3157K LED →
Reverse Light	3157K	Buy 3157K →
Dome Light	578	Buy 578 →
License Plate	194	Buy 194 →
Map Light	578	Buy 578 →
Parking Light	4157K	Buy 4157K →
Trunk Light	578	Buy 578 →

Installation Guide

Open in YouTube →

Video suggestion: Installation GuideBy YouTube

Other Avalanche Years

2011 2010 2009 2008 2007 2006 2004 2002

More from Chevrolet

Astro Aveo Beretta Blazer Bolt EV Camaro Camaro Z28 Camaro ZL1

Other Vehicles That Use 9006 LED Bulbs

2020 Dodge Journey 2019 GMC Savana 2500 HD 2019 GMC Savana 3500 HD 2015 Honda Civic 2015 Nissan Armada 2015 Nissan Titan