What is the low beam headlight bulb size for a 1997 GMC Sonoma?

The 1997 GMC Sonoma uses a H4666 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 1997 GMC Sonoma?

The high beam bulb size for the 1997 GMC Sonoma is PC74.

Why are my 1997 GMC Sonoma headlights dim?

Dim headlights on a 1997 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 H4666 LED LED conversion kit can provide a significantly brighter and whiter light output.

Which bulb fits the 1997 GMC Sonoma fog light?

The 1997 GMC Sonoma uses a H3 LED bulb for the fog light position.

Is the 1997 GMC Sonoma single or dual beam?

The 1997 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 1997 GMC Sonoma?

Yes, the 1997 GMC Sonoma comes with standard halogen bulbs from the factory, but they can be upgraded to LED. You will need a H4666 LED LED conversion kit for the low beams.

Does the 1997 GMC Sonoma have fog lights?

Yes, the 1997 GMC Sonoma takes a H3 LED bulb for the fog light position.

How do I change the headlight on a 1997 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 H4666 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 1997 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 H4666 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 1997 GMC Sonoma headlights?

A pair of halogen H4666 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 1997 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 H4666 LED position are available as direct plug-and-play replacements.

This vehicle is part of the 1995–1997 GMC Sonoma generation. All models in this range share identical light bulb sizes.

Fitment Guaranteed for 1997 GMC Sonoma

What Size Bulbs Does a 1997 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 1997 GMC Sonoma Have?

The 1997 GMC Sonoma utilizes a refined lighting configuration featuring 11 distinct bulb positions. It features an extensive lighting system powered by a dual-bulb halogen configuration using separate H4666 LED low beam and PC74 high beam bulbs for precise light distribution. This model belongs to the early years of the Sonoma's 1995-2004 production span.

Can You Put LED Bulbs in a 1997 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 H4666 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 H3 LED fog lights; switching these to LED can dramatically improve your visibility in adverse weather.

1997 GMC Sonoma Bulb Size Chart

Position	Bulb Size	Shop
Low Beam	H4666 LED	Buy H4666 LED →
High Beam	PC74	Buy PC74 →
Fog Light	H3 LED	Buy H3 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	1156	Buy 1156 →
License Plate	192	Buy 192 →
Parking Light	3157NA	Buy 3157NA →
Trunk Light	LED Light	Buy LED Light →