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2018 Chevrolet Silverado 1500 Bulb Size Chart

Bulb sizes may vary by trim, factory lighting package, region, production date, and previous modifications. Verify the bulb number on your existing bulb before buying.

Last database update: May 2026. Manual review status: Manually reviewed 2026-05-16.

Audit priority: High traffic truck.

Fitment data needs verification

This page is available for browsing, but it is marked noindex until the core bulb data is complete and unresolved manual-review findings are cleared.

Some fitment rows have conflicting source data

Rows marked Conflict or Needs review should not be used as purchase recommendations until the installed bulb, trim, and factory lighting package are confirmed.

  • Brake Light: 921
Verify before buying: check the bulb number printed on your existing bulb, confirm your trim and factory lighting package, and review the seller's fitment notes.
Disclosure: We may earn a commission from links marked Affiliate. Unmarked retailer links may be plain search links. Always verify bulb fitment before purchasing.

2018 Chevrolet Silverado 1500 Bulb Size Chart

PositionBulb CodeAliasesTrim / PackageFactory TypeConfidenceReviewNotesShop
Side Marker7443—Standard listingHalogenHigh
Verified2026-05-16

XenonPro lists 2016-2018 front and rear side marker as 7440/7443 and CarClubsUSA lists front side marker as 7443A. Keep the canonical value in the 7443/7440 family and verify amber/rear marker trim differences before purchase.

Amazon
Turn Signal Front7443—Standard listingHalogenHigh
Verified2026-05-16

XenonPro lists 2016-2018 front turn signal as 7440/7443 and CarClubsUSA lists front turn signal as 7443A. Keep the canonical value in the 7443/7440 family and verify amber socket requirements.

Amazon
Parking Light7443—Standard listingHalogenHigh
Verified2026-05-16

XenonPro lists 2016-2018 parking light as 7440/7443 and the 2018 Silverado fitment charts group the front marker/turn/parking lamps in the 7443-family. Verify trim and amber socket requirements.

Amazon
Reverse Light921—Standard listingHalogenHigh
Verified2026-05-16

XenonPro lists 2016-2018 reverse light as 912/921 and CarClubsUSA lists back-up reverse light as 921. Owner manual lamp service guidance still requires trim and assembly verification.

Amazon
Brake Light921—Standard listingHalogenMedium
Needs review2026-05-16

Current data lists 921, which matches the 912/921 high-mounted brake family in XenonPro. Rear brake/tail references list 7440/7443 or 7444, so this position needs a split between rear brake and high-mounted brake before marking verified.

Verify first
License PlateW5W—Standard listingHalogenHigh
Verified2026-05-16

Current W5W value is consistent with the 2825/W5W and 194/168 license-plate wedge family: CarClubsUSA lists 2825 and XenonPro lists 194/168. Keep W5W while retaining the equivalent-family caveat.

Amazon

2018 Chevrolet Silverado 1500 Fitment Notes

Across the 1999-2022 production range, our database shows changes in the listed High Beam, Low Beam, Brake Light positions. Use the chart above for this 2018 model, then confirm the bulb number in your vehicle before buying.

Known fitment limitations

  • factory HID or LED packages may use different parts
  • fog lights may depend on equipment package
  • aftermarket headlight assemblies may use different bulbs
  • regional models and production-date splits may differ

See an incorrect bulb size? Submit a correction.

How do the 2018 Chevrolet Silverado 1500's bulbs compare to other years?

The 2018 Chevrolet Silverado 1500 uses the same bulbs as the 2017 model.

The 2020 model switched to a different bulb configuration.

This bulb configuration covers the 2017–2018 model years. ← 2017 2020 →

Finding the best installation guide...

Other Silverado 1500 Years

2022202120202017201620152014201320122011201020092008200720062005200420032002200120001999

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Frequently Asked Questions

Our database lists N/A for the 2018 Chevrolet Silverado 1500 low beam headlights. Verify the bulb number on your existing bulb and confirm your trim or factory lighting package before buying.

Our database lists N/A for the 2018 Chevrolet Silverado 1500 high beam position. Some vehicles vary by trim, lighting package, or previous housing changes.

Dim headlights on a 2018 Chevrolet Silverado 1500 can come from aging halogen bulbs, cloudy lenses, weak electrical connections, or an incorrect bulb. Confirm the listed N/A size against the bulb in the housing before choosing a replacement or upgrade.

The 2018 Chevrolet Silverado 1500 does not have a fog light bulb listed in our current database. If your vehicle has fog lights, verify the bulb in the housing or owner's manual before buying.

The 2018 Chevrolet Silverado 1500 uses a dual bulb headlight system. This means you have separate bulbs for high and low beams.

LED upgrades are available for many N/A applications, but fitment, beam pattern, dashboard warnings, and road-use legality can vary. Use products that list your exact bulb family, such as N, and verify the factory housing before buying.

No — the 2018 Chevrolet Silverado 1500 uses the same bulb sizes as the 2017 model. This configuration has been consistent across the 2017–2018 generation.

The 2018 Chevrolet Silverado 1500 is the last year in the 2017–2018 generation to use the N/A bulb for the low beam headlight.

Access varies by engine bay layout and headlight housing. Before disassembly, confirm the listed N/A low beam size on the existing bulb or owner's manual, then follow the service procedure for your exact trim.

Rules for LED headlight retrofits vary by location and by housing type. Avoid products that create glare or lack road-use compliance claims, and check local requirements before using an LED conversion on public roads.

Replacement cost depends on bulb technology, brand, and labor access. Common halogen N/A replacements are usually cheaper than LED conversion kits. Check seller fitment notes before comparing prices.

Halogen bulbs and LED replacements differ in output, heat behavior, beam pattern, and electronics. A correct bulb code does not guarantee a correct LED beam pattern, so verify physical fit and seller compatibility notes for the 2018 Chevrolet Silverado 1500.