The 2020 Cadillac CT6 has 27 electrical parts with verified fitment on this page — 10 part types and 11 brands, covering both the 3.6L V6 and the 4.2L V8 Turbocharged. Each part includes a manufacturer part number and application notes.
The electrical system on the 2020 Cadillac CT6 covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. The largest groups are Battery (10 parts), Battery Cable (5 parts) and Body Control Module (BCM) (3 parts). The other 7 part types cover the remaining 9 parts.
The 2020 Cadillac CT6 was sold with both the 3.6L V6 and the 4.2L V8 Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
11 brands supply electrical parts for the 2020 Cadillac CT6, led by GM GENUINE (15 parts), FVP (2 parts) and ACDELCO (2 parts), plus 8 more brands. Quality grades include AGM and Performance AGM.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2020 Cadillac CT6. 2 parts have it, including DEKA 9A49 (Battery) and LUCAS LBAGM005A (Battery). Each part number opens a page with every vehicle that part fits.
Alternator / Generator
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Fits: 4.2L V8 Turbocharged | 10390 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| PURE ENERGY Fits: 4.2L V8 Turbocharged | 10390 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator.
2 Alternator / Generator parts for the 2020 Cadillac CT6 come from 2 brands — FVP and PURE ENERGY.
This group includes FVP 10390 and the remaining parts above.
Anti-Theft Control Module
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 4.2L V8 Turbocharged | 13540633 | 🇺🇸 US 🇨🇦 CA | Width: 12.95 In | View on Amazon |
This table covers the Anti-Theft control modules.
One part is listed for the 2020 Cadillac CT6 — GM GENUINE 13540633.
Anti-Theft Siren
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 4.2L V8 Turbocharged | 39119104 | 🇺🇸 US 🇨🇦 CA | Self Powered Theft deterrent Horn Alarm (UTR)Mating Connector Use 84999471 | View on Amazon |
| GM GENUINE Fits: 4.2L V8 Turbocharged | 13569122 | 🇺🇸 US 🇨🇦 CA | Self Powered Theft deterrent Horn Alarm (UTR) | View on Amazon |
This table covers the sirens in the anti-theft system.
GM GENUINE supplies both parts for the 2020 Cadillac CT6.
Listed part numbers: GM GENUINE 39119104 and GM GENUINE 13569122.
Anti-Theft Siren Bracket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 4.2L V8 Turbocharged | 23174009 | 🇺🇸 US 🇨🇦 CA | Self Powered Theft Deterrent Horn Alarm (UTR) | View on Amazon |
This table covers the brackets that mount the Anti-Theft Siren. Typical signs include a cracked mount, a rattle, or a bracket that no longer holds alignment. Confirm position in the notes. Many brackets look alike and bolt to different corners.
One part is listed for the 2020 Cadillac CT6 — GM GENUINE 23174009.
Battery
AGM (Extended Life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DEKA Popular Fits: 4.2L V8 Turbocharged | 9A49 | 🇺🇸 US 🇨🇦 CA | IntimidatorAGM | View on Amazon |
| LUCAS Popular Fits: 4.2L V8 Turbocharged | LBAGM005A | 🇺🇸 US 🇨🇦 CA | BCI Group: 94RAGM | View on Amazon |
| ACDELCO Fits: 4.2L V8 Turbocharged | 49AGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 49 | View on Amazon |
| ACDELCO Fits: 4.2L V8 Turbocharged | 49AGMHR | 🇺🇸 US 🇨🇦 CA | High ReserveAGM | View on Amazon |
| BOSCH Fits: 4.2L V8 Turbocharged | S6588B | 🇺🇸 US 🇨🇦 CA | AGMAGM | View on Amazon |
| EXIDE Fits: 4.2L V8 Turbocharged | MXH8L549 | 🇺🇸 US 🇨🇦 CA | Marathon MaxBCI Group 49 (H8) | View on Amazon |
| FVP Fits: 4.2L V8 Turbocharged | P49AGM | 🇺🇸 US 🇨🇦 CA | Platinum AGMBCI Group: 49 | View on Amazon |
| MOTORCRAFT Fits: 4.2L V8 Turbocharged | BAGM49H8 | 🇺🇸 US 🇨🇦 CA | Tested Tough AGMBCI Group: 49/H8 or BCI Group 49 | View on Amazon |
| P1MAX Fits: 4.2L V8 Turbocharged | PMAGMH849 | 🇺🇸 US 🇨🇦 CA | BCI Group 49 AGM850 CCA | View on Amazon |
Performance AGM (Extended Life + Increased Power)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FULLRIVER Fits: 4.2L V8 Turbocharged | FT89049 | 🇺🇸 US 🇨🇦 CA | BCI Group 49(Length X Width X Height) 13.9 In x 6.89 In x 7.48 In | View on Amazon |
This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery.
10 Battery parts are listed for the 2020 Cadillac CT6, from ACDELCO, DEKA, LUCAS and 6 other brands. DEKA 9A49 carries the "Popular" badge.
The AGM (Extended Life) section lists 9 options from ACDELCO, DEKA, LUCAS and 5 other brands — grouped under the catalog's "AGM (Extended Life)" designation — the notes column spells out what sets them apart. DEKA 9A49 is listed in this group.
The Performance AGM (Extended Life + Increased Power) section lists 1 option from FULLRIVER — grouped under the catalog's "Performance AGM (Extended Life + Increased Power)" designation — the notes column spells out what sets them apart. FULLRIVER FT89049 is listed in this group.
Battery Cable
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 4.2L V8 Turbocharged | 23249556 | 🇺🇸 US 🇨🇦 CA | Positive AuxiliaryPlatinum | View on Amazon |
| GM GENUINE Fits: 4.2L V8 Turbocharged | 84230997 | 🇺🇸 US 🇨🇦 CA | Negative AuxiliaryPlatinum | View on Amazon |
| GM GENUINE Fits: 4.2L V8 Turbocharged | 84382384 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| GM GENUINE Fits: 4.2L V8 Turbocharged | 84488910 | 🇺🇸 US 🇨🇦 CA | PositiveExcept Hands-Free Lane Following Radar/Lane Active Safety (UKL) | View on Amazon |
| GM GENUINE Fits: 4.2L V8 Turbocharged | 84488911 | 🇺🇸 US 🇨🇦 CA | PositivePlatinum | View on Amazon |
This table covers the positive and ground cables that run from the battery. Typical signs include a stretched or frayed cable, or a control that no longer reaches the end of its travel. Route the new cable through the same clips. A kinked cable binds and fails early.
5 Battery Cable parts for the 2020 Cadillac CT6 come from GM GENUINE.
Part numbers include GM GENUINE 23249556, GM GENUINE 84230997 and GM GENUINE 84382384, among others listed above.
Body Control Module (BCM)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 4.2L V8 Turbocharged | 13534191 | 🇺🇸 US 🇨🇦 CA | Labeled GEN III RLabeled 13518626, 13518593 | View on Amazon |
| GM GENUINE Fits: 4.2L V8 Turbocharged | 22940857 | 🇺🇸 US 🇨🇦 CA | Hands Free Power Lift Gate (TC2), Power Operated Decklid (TL9)Liftgate Module | View on Amazon |
| GM GENUINE Fits: 4.2L V8 Turbocharged | 13527264 | 🇺🇸 US 🇨🇦 CA | Local Programming Required | View on Amazon |
This table covers the body-control modules that run lighting, locks and wipers.
3 Body Control Module (BCM) parts for the 2020 Cadillac CT6 come from GM GENUINE.
Listed part numbers: GM GENUINE 13534191, GM GENUINE 22940857 and GM GENUINE 13527264.
Engine Control Module (ECM Computer)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 4.2L V8 Turbocharged | 12704397 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the engine-control modules that run fuel, spark and emissions.
This group shows a single part: GM GENUINE 12704397.
Hands Free Vehicle Access Module
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 4.2L V8 Turbocharged | 23275430 | 🇺🇸 US 🇨🇦 CA | Fits Platinumwithout Bracket,Sensor,Bolt or Nut | View on Amazon |
This table covers the Hands Free Vehicle Access modules. Typical signs include a cluster of unrelated faults, a no-communication code, or a module that will not sleep. Confirm power, ground and programming compatibility in the notes. Modules are rarely plug-and-play across years.
This group shows a single part: GM GENUINE 23275430.
Horn
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 4.2L V8 Turbocharged | 84098961 | 🇺🇸 US 🇨🇦 CA | Exc. 45KW Continuous Power Plug-in Electric Parallel Hybrid Propulsion (HP9) | View on Amazon |
This table covers the horns mounted in the front of the vehicle.
One part is listed for the 2020 Cadillac CT6 — GM GENUINE 84098961.
Buying Electrical Parts for a 2020 Cadillac CT6
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- Match the engine first. Every electrical 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, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Battery and Battery Cable .
Frequently Asked Questions
How many electrical parts fit the 2020 Cadillac CT6?
Our catalog currently lists 27 electrical parts for the 2020 Cadillac CT6 across 10 subcategories and 11 brands, covering both the 3.6L V6 and the 4.2L V8 Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical parts differ between 2020 Cadillac CT6 engines?
Yes. Every electrical 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 problems on a 2020 Cadillac CT6?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. 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, clean or renew the battery terminals and grounds with any charging-system repair.
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 2020 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 2020 Cadillac CT6?
First match the engine — each row shows which engine(s) the part fits. Then test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2020 Cadillac CT6
Electrical Parts for Other Cadillac CT6 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.