What is the low beam headlight bulb size for a 1999 GMC Sonoma?

The 1999 GMC Sonoma 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 1999 GMC Sonoma?

The high beam bulb size for the 1999 GMC Sonoma is PC74.

Why are my 1999 GMC Sonoma headlights dim?

Dim headlights on a 1999 GMC Sonoma 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 1999 GMC Sonoma fog light?

The 1999 GMC Sonoma uses a 881 LED bulb for the fog light position.

Is the 1999 GMC Sonoma single or dual beam?

The 1999 GMC Sonoma uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

Can I install LED bulbs on my 1999 GMC Sonoma?

Yes, the 1999 GMC Sonoma 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 1999 GMC Sonoma have fog lights?

Yes, the 1999 GMC Sonoma takes a 881 LED bulb for the fog light position.

Did the 1999 GMC Sonoma change headlight bulb sizes from the previous year?

No — the 1999 GMC Sonoma uses the same bulb sizes as the 1998 model. This configuration has been consistent across the 1998–2000 generation.

How do I change the headlight on a 1999 GMC Sonoma?

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 1999 GMC Sonoma?

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 1999 GMC Sonoma 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 1999 GMC Sonoma?

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.

The 1999 GMC Sonoma shares its bulb sizes with the 1998–2000 generation.

Fitment Guaranteed for 1999 GMC Sonoma

What Size Bulbs Does a 1999 GMC Sonoma 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 1999 GMC Sonoma Have?

Lighting on the 1999 GMC Sonoma 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 PC74 high beam bulbs for precise light distribution. This model belongs to the mid years of the Sonoma's 1991-2004 production span.

Can You Put LED Bulbs in a 1999 GMC Sonoma?

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 PC74 LED kit later will complete the look and ensure consistent lighting performance. Don't forget the 881 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

1999 GMC Sonoma Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	9006 LED	Buy 9006 LED →
High Beam	PC74	Buy PC74 →
Fog Light	881 LED	Buy 881 LED →
Brake Light	PC74	Buy PC74 →
Side Marker	194 LED	Buy 194 LED →
Turn Signal Front	3157NA LED	Buy 3157NA LED →
Turn Signal Rear	3057 LED	Buy 3057 LED →
Reverse Light	3057	Buy 3057 →
License Plate	192	Buy 192 →
Map Light	212-2	Buy 212-2 →
Parking Light	3157NA	Buy 3157NA →
Trunk Light	211-2	Buy 211-2 →
Tail Light	3157CK	Buy 3157CK →

How do the 1999 GMC Sonoma's bulbs compare to other years?

The 1999 GMC Sonoma uses the same bulbs as the 1998 model.

The 2000 model continues with the same bulb sizes.

This bulb configuration covers the 1998–2000 model years. ← 1998 2000 →

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Other Sonoma Years

2004 2003 2002 2001 2000 1998 1997 1996 1995 1994 1993 1992 1991

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