What is the low beam headlight bulb size for a 2001 GMC Sierra 2500?

The 2001 GMC Sierra 2500 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 2001 GMC Sierra 2500?

The high beam bulb size for the 2001 GMC Sierra 2500 is 74.

Why are my 2001 GMC Sierra 2500 headlights dim?

Dim headlights on a 2001 GMC Sierra 2500 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 2001 GMC Sierra 2500 fog light?

The 2001 GMC Sierra 2500 uses a 880 LED bulb for the fog light position.

Is the 2001 GMC Sierra 2500 single or dual beam?

The 2001 GMC Sierra 2500 uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 2001 GMC Sierra 2500?

Yes, the 2001 GMC Sierra 2500 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 2001 GMC Sierra 2500 have fog lights?

Yes, the 2001 GMC Sierra 2500 takes a 880 LED bulb for the fog light position.

How do I change the headlight on a 2001 GMC Sierra 2500?

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 2001 GMC Sierra 2500?

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 2001 GMC Sierra 2500 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 2001 GMC Sierra 2500?

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 2001 GMC Sierra 2500

What Size Bulbs Does a 2001 GMC Sierra 2500 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 2001 GMC Sierra 2500 Have?

When it comes to nighttime visibility, the 2001 GMC Sierra 2500 relies on an arrangement of 13 specialized bulbs. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate 9006 LED low beam and 74 high beam bulbs for precise light distribution.

Can You Put LED Bulbs in a 2001 GMC Sierra 2500?

For a GMC 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 74 LED kit later will complete the look and ensure consistent lighting performance. Don't forget the 880 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

2001 GMC Sierra 2500 Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9006 LED	Buy 9006 LED →
High Beam	74	Buy 74 →
Fog Light	880 LED	Buy 880 LED →
Brake Light	74	Buy 74 →
Side Marker	194 LED	Buy 194 LED →
Turn Signal Front	3157NA LED	Buy 3157NA LED →
Turn Signal Rear	3157K LED	Buy 3157K LED →
Reverse Light	3157K	Buy 3157K →
Dome Light	211-2	Buy 211-2 →
License Plate	194	Buy 194 →
Map Light	578 or 168	Buy 578 or 168 →
Parking Light	3157NA	Buy 3157NA →
Trunk Light	912	Buy 912 →