14 Electrical parts are listed for the 2020 GMC Sierra 2500, in 4 part types, covering both the 6.6L V8 and the 6.6L V8 DIESEL Turbocharged. Each one has a brand, a manufacturer part number and notes that say where it fits.
The electrical system on the 2020 GMC Sierra 2500 covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. The largest groups are Alternator / Generator (7 parts), Alternator / Generator Pulley (3 parts) and Alternator / Generator Bushing (2 parts). The other 1 part type covers the remaining 2 parts.
The 2020 GMC Sierra 2500 was sold with both the 6.6L V8 and the 6.6L V8 DIESEL Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
7 brands supply electrical parts for the 2020 GMC Sierra 2500, led by GM GENUINE (6 parts), FVP (2 parts) and LITENS (2 parts), plus 4 more brands. Quality grades include Remanufactured and New.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2020 GMC Sierra 2500. 2 parts have it, including GM GENUINE 85671415 (Alternator / Generator) and GM GENUINE 13563314 (Alternator / Generator). Each part number opens a page with every vehicle that part fits.
Alternator / Generator
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular Fits: 6.6L V8 DIESEL Turbocharged | 85671415 | 🇺🇸 US 🇨🇦 CA | AuxiliaryDUAL 170 AMP AND 220 AMP Generator (KHF) | View on Amazon |
| GM GENUINE Popular Fits: 6.6L V8 DIESEL Turbocharged | 13563314 | 🇺🇸 US 🇨🇦 CA | Dual 170 Amp and 220 Amp Generator (KHF) or 220 Amp Generator (KW5) | View on Amazon |
| WAI GLOBAL Fits: 6.6L V8 DIESEL Turbocharged | 11785N | 🇺🇸 US 🇨🇦 CA | 150 Amps Denso | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FVP Fits: 6.6L V8 DIESEL Turbocharged | 10394 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| FVP Fits: 6.6L V8 DIESEL Turbocharged | 10405 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| PURE ENERGY Fits: 6.6L V8 DIESEL Turbocharged | 10405 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER Fits: 6.6L V8 DIESEL Turbocharged | 42358 | 🇺🇸 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.
7 Alternator / Generator parts for the 2020 GMC Sierra 2500 come from 5 brands — GM GENUINE, FVP, WAI GLOBAL and 2 other brands. The "Popular" part is GM GENUINE 85671415.
The New section lists 3 options from GM GENUINE and WAI GLOBAL — brand-new units rather than rebuilt ones. GM GENUINE 85671415 is listed in this group.
The Remanufactured section lists 4 options from FVP, PURE ENERGY and TERREPOWER — factory-rebuilt units with new wear components. FVP 10394 is listed in this group.
Part numbers include GM GENUINE 85671415, GM GENUINE 13563314 and WAI GLOBAL 11785N, among others listed above.
Alternator / Generator Bushing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 12624586 | 🇺🇸 US 🇨🇦 CA | 18.5 Diameter X 1510.5 Through Hole | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 12623219 | 🇺🇸 US 🇨🇦 CA | 15.5 Diameter X 18.98.5 Through Hole | View on Amazon |
This table covers the Alternator / Generator bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles.
2 Alternator / Generator Bushing parts for the 2020 GMC Sierra 2500 come from GM GENUINE.
This group includes GM GENUINE 12624586 and GM GENUINE 12623219.
Alternator / Generator Pulley
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: 6.6L V8 DIESEL Turbocharged | 49903 | 🇺🇸 US 🇨🇦 CA | Grooved Pulley | View on Amazon |
| LITENS Fits: 6.6L V8 DIESEL Turbocharged | 920112A | 🇺🇸 US 🇨🇦 CA | with 220 Amp Mitsubishi Alternator | View on Amazon |
| LITENS Fits: 6.6L V8 DIESEL Turbocharged | 920111A | 🇺🇸 US 🇨🇦 CA | Secondary Alternator - 190 Amps | View on Amazon |
This table covers the pulleys on the alternator shaft. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt.
3 Alternator / Generator Pulley parts are listed for the 2020 GMC Sierra 2500, from LITENS and CONTINENTAL.
Part numbers include CONTINENTAL 49903, LITENS 920112A and LITENS 920111A.
Anti-Theft Control Module
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 13516351 | 🇺🇸 US 🇨🇦 CA | Fits Exc. Keyless Engine Start Switch (BTM),AUTO HEAT STEERING WHEEL(KI3)Cruise Control (K34) | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 13516352 | 🇺🇸 US 🇨🇦 CA | Fits Extended Range Passive Entry Remote Lock Control - All Doors (ATH), Extended Range Passive Entry Remote Lock Control - Front Doors (AVJ), Driver and Passenger Front Split Seat (AZ3) | View on Amazon |
This table covers the Anti-Theft control modules.
GM GENUINE supplies both parts for the 2020 GMC Sierra 2500.
This group includes GM GENUINE 13516351 and GM GENUINE 13516352.
Buying Electrical Parts for a 2020 GMC Sierra 2500
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: Alternator / Generator and Alternator / Generator Pulley .
Frequently Asked Questions
How many electrical parts fit the 2020 GMC Sierra 2500?
Our catalog currently lists 14 electrical parts for the 2020 GMC Sierra 2500 across 4 subcategories and 7 brands, covering both the 6.6L V8 and the 6.6L V8 DIESEL Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical parts differ between 2020 GMC Sierra 2500 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 GMC Sierra 2500?
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 GMC Sierra 2500 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 GMC Sierra 2500?
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 GMC Sierra 2500
Electrical Parts for Other GMC Sierra 2500 Years
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