This page lists 12 electrical bulb & socket parts for the 2018 Cadillac CT6, across 5 part types, covering all 4 engine options (2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged, 3.0L V6 Turbocharged and 3.6L V6). Every part shows its brand, manufacturer part number and fitment notes.
On the 2018 Cadillac CT6, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination. 10 parts of the 12 listed are Back Up / Reverse Lamp Bulb (7 parts), Trunk / Cargo Area Light Bulb (2 parts) and Step / Courtesy Light Bulb (1 part). The other 2 part types cover the remaining 2 parts.
The 2018 Cadillac CT6 was sold with 4 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2018 Cadillac CT6 electrical bulb & socket parts are SYLVANIA (4 parts), WAGNER (3 parts) and GM GENUINE (3 parts), plus 2 more brands. Quality grades include Standard Replacement, Extended Life and Extra Bright.
2 parts on this 2018 Cadillac CT6 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including SYLVANIA 921LL (Back Up / Reverse Lamp Bulb) and HELLA 921 (Back Up / Reverse Lamp Bulb). Click any part number to see every vehicle that part fits.
Back Up / Reverse Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 921LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: W2.1x9.2d | View on Amazon |
| WAGNER Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 921LL | 🇺🇸 US 🇨🇦 CA | Long LifeWedge Base | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 921ST | 🇺🇸 US 🇨🇦 CA | Cool WhiteSilver Star | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 921WLED | 🇺🇸 US 🇨🇦 CA | LEDWhite | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 921 | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: W2.1x9.5d | View on Amazon |
| SYLVANIA Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 921 | 🇺🇸 US 🇨🇦 CA | Base Type: W2.1x9.2dWattage: 18.00 W | View on Amazon |
| WAGNER Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 921 | 🇺🇸 US 🇨🇦 CA | Bulb Type: T-5 Bulb 5/8 (16mm) DiameterVoltage: 12.800 Volts (Direct Current) | View on Amazon |
This table covers the bulbs in the reverse lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
7 Back Up / Reverse Lamp Bulb parts are listed for the 2018 Cadillac CT6, from SYLVANIA, WAGNER and HELLA. SYLVANIA 921LL carries the "Popular" badge.
The Extended Life section lists 2 options from SYLVANIA and WAGNER — grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. SYLVANIA 921LL is listed in this group.
The Extra Bright (improved visibility, but shorter life) section lists 1 option from SYLVANIA — grouped under the catalog's "Extra Bright (improved visibility, but shorter life)" designation — the notes column spells out what sets them apart. SYLVANIA 921ST is listed in this group.
In the LED (instant-on, long life, energy-saving) grade, WAGNER supplies 1 part: grouped under the catalog's "LED (instant-on, long life, energy-saving)" designation — the notes column spells out what sets them apart. A representative part number is WAGNER 921WLED.
The Standard Replacement section lists 3 options from HELLA, SYLVANIA and WAGNER — built to original-equipment specification. HELLA 921 is listed in this group.
This group includes SYLVANIA 921LL and SYLVANIA 921ST and the remaining parts above.
Step / Courtesy Light Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 13500832 | 🇺🇸 US 🇨🇦 CA | RearCLEAR | View on Amazon |
This table covers the bulbs in the step and courtesy lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
One part is listed for the 2018 Cadillac CT6 — GM GENUINE 13500832.
Trunk / Cargo Area Light Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PEAK Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 168 | 🇺🇸 US 🇨🇦 CA | Trunk LightBulb | View on Amazon |
| SYLVANIA Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 175SL | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
This table covers the bulbs in the trunk or cargo-area lamp. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
2 Trunk / Cargo Area Light Bulb parts for the 2018 Cadillac CT6 come from 2 brands — PEAK and SYLVANIA.
Listed part numbers: PEAK 168 and SYLVANIA 175SL.
Turn Signal Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 13503360 | 🇺🇸 US 🇨🇦 CA | TRADE # W16WCLEAR | View on Amazon |
This table covers the bulbs in the turn-signal lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
One part is listed for the 2018 Cadillac CT6 — GM GENUINE 13503360.
Vanity Mirror / Sun Visor Light Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 2.0L L4 ELECTRIC/GAS Turbocharged | 13502343 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the replacement bulbs for the Vanity Mirror / Sun Visor Light. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
This group shows a single part: GM GENUINE 13502343.
Buying Electrical Bulb & Socket Parts for a 2018 Cadillac CT6
On this vehicle, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination.
- Match the engine first. Every electrical bulb & socket part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Back Up / Reverse Lamp Bulb and Trunk / Cargo Area Light Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 2018 Cadillac CT6?
Our catalog currently lists 12 electrical bulb & socket parts for the 2018 Cadillac CT6 across 5 subcategories and 5 brands, covering all 4 engine options (2.0L L4 ELECTRIC/GAS Turbocharged, 2.0L L4 Turbocharged, 3.0L V6 Turbocharged and 3.6L V6). Each part is matched to the engine(s) it fits.
Do electrical bulb & socket parts differ between 2018 Cadillac CT6 engines?
Yes. Every electrical bulb & socket part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical bulb & socket problems on a 2018 Cadillac CT6?
Common symptoms include a lamp that flickers over bumps, melted or discolored socket plastic, or bulbs that keep failing early on one side. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2018 Cadillac CT6 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2018 Cadillac CT6?
First match the engine — each row shows which engine(s) the part fits. Then repeated bulb failure in one position usually means a socket or ground problem, not bad bulbs — replace the socket rather than chase it. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2018 Cadillac CT6
Electrical Bulb & Socket Parts for Other Cadillac CT6 Years
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