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2020 Cadillac CT6 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: Not yet manually reviewed.

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.

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.
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2020 Cadillac CT6 Bulb Size Chart

PositionBulb CodeAliasesTrim / PackageFactory TypeConfidenceReviewNotesShop
Reverse Light921—Standard listingHalogenMedium
Pending

Verify trim, factory lighting package, and the bulb number on the existing bulb.

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2020 Cadillac CT6 Fitment Notes

Our database shows the same listed bulb sizes for the Cadillac CT6 across the 2016 to 2020 range. Still verify your trim, lighting package, and the bulb number in the housing 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 2020 Cadillac CT6's bulbs compare to other years?

The 2020 Cadillac CT6 uses the same bulbs as the 2019 model.

This bulb configuration covers the 2019–2020 model years. ← 2019

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Other CT6 Years

2019201820172016

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Frequently Asked Questions

Our database lists N/A for the 2020 Cadillac CT6 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 2020 Cadillac CT6 high beam position. Some vehicles vary by trim, lighting package, or previous housing changes.

Dim headlights on a 2020 Cadillac CT6 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 2020 Cadillac CT6 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 2020 Cadillac CT6 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 2020 Cadillac CT6 uses the same bulb sizes as the 2019 model. This configuration has been consistent across the 2019–2020 generation.

The 2020 Cadillac CT6 is the last year in the 2019–2020 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 2020 Cadillac CT6.