The 2021 GMC Sierra 2500 has 33 electrical bulb & socket parts with verified fitment on this page — 11 part types and 3 brands, covering both the 6.6L V8 and the 6.6L V8 DIESEL Turbocharged. Each part includes a manufacturer part number and application notes.
On the 2021 GMC Sierra 2500, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination. 17 parts of the 33 listed are Back Up / Reverse Lamp Bulb (6 parts), Brake Light Bulb (6 parts) and Turn Signal Lamp Bulb (5 parts). The other 8 part types cover the remaining 16 parts.
The 2021 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.
The most listed brands for 2021 GMC Sierra 2500 electrical bulb & socket parts are WAGNER (18 parts), GM GENUINE (13 parts) and PHILIPS (2 parts). Quality grades include Standard Replacement, Extended Life and LED.
5 parts on this 2021 GMC Sierra 2500 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including PHILIPS 1156LL (Back Up / Reverse Lamp Bulb) and WAGNER 7443LL (Brake Light 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 |
|---|---|---|---|---|
| PHILIPS Popular Fits: 6.6L V8 DIESEL Turbocharged | 1156LL | 🇺🇸 US 🇨🇦 CA | Longer Life | View on Amazon |
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 921LL | 🇺🇸 US 🇨🇦 CA | Long LifeWedge Base | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 921WLED | 🇺🇸 US 🇨🇦 CA | LEDWhite | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular Fits: 6.6L V8 DIESEL Turbocharged | 921 | 🇺🇸 US 🇨🇦 CA | Bulb Type: T-5 Bulb 5/8 (16mm) DiameterVoltage: 12.800 Volts (Direct Current) | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | L1156 | 🇺🇸 US 🇨🇦 CA | Height: 1.2 InTerminal Type: Pressure Contact | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 13503360 | 🇺🇸 US 🇨🇦 CA | Base Model or SLE Model82.2" bed or 98.2" bed | 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.
6 Back Up / Reverse Lamp Bulb parts are listed for the 2021 GMC Sierra 2500, from WAGNER, GM GENUINE and PHILIPS. PHILIPS 1156LL carries the "Popular" badge.
The Extended Life section lists 2 options from PHILIPS and WAGNER — grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. PHILIPS 1156LL 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 GM GENUINE and WAGNER — built to original-equipment specification. WAGNER 921 is listed in this group.
Listed part numbers: PHILIPS 1156LL, WAGNER 921LL and WAGNER 921WLED, plus the other parts above.
Brake Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular Fits: 6.6L V8 DIESEL Turbocharged | 7443LL | 🇺🇸 US 🇨🇦 CA | Long LifeDouble Contact Wedge Base | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 7443LEDW | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular Fits: 6.6L V8 DIESEL Turbocharged | 7443 | 🇺🇸 US 🇨🇦 CA | Double Contact Wedge Base21.000 Watt | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | L1157 | 🇺🇸 US 🇨🇦 CA | Height: 2 inSecondary Average Rated Life: 800 Hour | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 13579188 | 🇺🇸 US 🇨🇦 CA | 82.2" bed or 98.2" bedFleetside | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 13591403 | 🇺🇸 US 🇨🇦 CA | 82.2" bed or 98.2" bedFleetside | View on Amazon |
This table covers the bulbs in the stop 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.
6 Brake Light Bulb parts are listed for the 2021 GMC Sierra 2500, from WAGNER and GM GENUINE. WAGNER 7443LL carries the "Popular" badge.
The Extended Life section: 1 option from WAGNER. WAGNER 7443LL is listed in this group.
LED (instant-on, long life, energy-saving): 1 part, from WAGNER. A representative part number is WAGNER 7443LEDW.
The Standard Replacement section: 4 options from GM GENUINE and WAGNER. WAGNER 7443 is listed in this group.
This group includes WAGNER 7443LL, WAGNER 7443LEDW and WAGNER 7443 and the remaining parts above.
Brake Light Bulb - High Mount
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 13503403 | 🇺🇸 US 🇨🇦 CA | Standard Cab PickupAT4 Trim Package (GFG), Elevation Trim Package (GFJ) | View on Amazon |
This table covers the bulbs in the high-mount stop lamp. Typical signs include a clunk on takeoff, a vibration at idle, or a separated rubber insert. Support the powertrain before unbolting a mount, and torque the fasteners in the notes.
One part is listed for the 2021 GMC Sierra 2500 — GM GENUINE 13503403.
Fog / Driving Lamp Bulb
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 5202WLED | 🇺🇸 US 🇨🇦 CA | FrontLED Replacement | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 5202 | 🇺🇸 US 🇨🇦 CA | Front | View on Amazon |
This table covers the bulbs in the fog and driving 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.
2 Fog / Driving Lamp Bulb parts for the 2021 GMC Sierra 2500 come from WAGNER.
The LED (instant-on, long life, energy-saving) section: 1 option from WAGNER. WAGNER 5202WLED is listed in this group.
Standard Replacement: 1 part, from WAGNER. A representative part number is WAGNER 5202.
Listed part numbers: WAGNER 5202WLED and WAGNER 5202.
Headlamp Socket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 84389022 | 🇺🇸 US 🇨🇦 CA | Base Model or SLE Model | View on Amazon |
This table covers the sockets that hold a headlamp bulb in the housing. Typical signs include a flicker over bumps, melted plastic, or a bulb that will not stay seated. Dielectric grease on the contacts slows corrosion. Do not force a bulb into a heat-damaged socket.
This group shows a single part: GM GENUINE 84389022.
License Plate Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 13503401 | 🇺🇸 US 🇨🇦 CA | T3-1/4 MINIATURE WEDGE BASE | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 13503359 | 🇺🇸 US 🇨🇦 CA | SIDE MARKER SOCKET | View on Amazon |
This table covers the bulbs that light the license plate. 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.
GM GENUINE supplies both parts for the 2021 GMC Sierra 2500.
This group includes GM GENUINE 13503401 and GM GENUINE 13503359.
Parking Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 7443LL | 🇺🇸 US 🇨🇦 CA | Long LifeDouble Contact Wedge Base | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 7443LEDW | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 7443 | 🇺🇸 US 🇨🇦 CA | Double Contact Wedge Base21.000 Watt | View on Amazon |
This table covers the bulbs in the parking 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.
3 Parking Lamp Bulb parts for the 2021 GMC Sierra 2500 come from WAGNER.
Extended Life: 1 part, from WAGNER. A representative part number is WAGNER 7443LL.
The LED (instant-on, long life, energy-saving) section: 1 option from WAGNER. WAGNER 7443LEDW is listed in this group.
Standard Replacement: 1 part, from WAGNER. A representative part number is WAGNER 7443.
Part numbers include WAGNER 7443LL, WAGNER 7443LEDW and WAGNER 7443.
Tail Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 7443LL | 🇺🇸 US 🇨🇦 CA | Long LifeDouble Contact Wedge Base | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 7443LEDW | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 7443WLED | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 7443 | 🇺🇸 US 🇨🇦 CA | Double Contact Wedge Base21.000 Watt | View on Amazon |
This table covers the bulbs in the tail 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.
4 Tail Lamp Bulb parts for the 2021 GMC Sierra 2500 come from WAGNER.
Extended Life: 1 part, from WAGNER. A representative part number is WAGNER 7443LL.
The LED (instant-on, long life, energy-saving) section: 2 options from WAGNER. WAGNER 7443LEDW is listed in this group.
Standard Replacement: 1 part, from WAGNER. A representative part number is WAGNER 7443.
Listed part numbers: WAGNER 7443LL, WAGNER 7443LEDW and WAGNER 7443WLED, plus the other parts above.
Tail Lamp Socket / Connector Plate
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 84574264 | 🇺🇸 US 🇨🇦 CA | AT4 Model or Denali or SLT Model82.2" bed or 98.2" bed | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 84574263 | 🇺🇸 US 🇨🇦 CA | Base Model or SLE Model82.2" bed or 98.2" bed | View on Amazon |
This table covers the Tail Lamp Socket / Connector plates. Typical signs include warpage, cracks, or a plate that no longer locates the assembly. Confirm which plate the notes describe — backing plates, clutch plates and strike plates are different parts.
2 Tail Lamp Socket / Connector Plate parts for the 2021 GMC Sierra 2500 come from GM GENUINE.
Listed part numbers: GM GENUINE 84574264 and GM GENUINE 84574263.
Turn Signal Indicator Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 86287060 | 🇺🇸 US 🇨🇦 CA | with Bolt | View on Amazon |
This table covers the replacement bulbs for the Turn Signal Indicator 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.
This group shows a single part: GM GENUINE 86287060.
Turn Signal Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: 6.6L V8 DIESEL Turbocharged | 7444NALL | 🇺🇸 US 🇨🇦 CA | Longer LifeNatural Amber | View on Amazon |
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 7443LL | 🇺🇸 US 🇨🇦 CA | Long LifeDouble Contact Wedge Base | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 6.6L V8 DIESEL Turbocharged | 7443LEDW | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular Fits: 6.6L V8 DIESEL Turbocharged | 7443 | 🇺🇸 US 🇨🇦 CA | Double Contact Wedge Base21.000 Watt | View on Amazon |
| GM GENUINE Fits: 6.6L V8 DIESEL Turbocharged | 13579188 | 🇺🇸 US 🇨🇦 CA | FrontBase Model or SLE Model | 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.
5 Turn Signal Lamp Bulb parts are listed for the 2021 GMC Sierra 2500, from WAGNER, PHILIPS and GM GENUINE. WAGNER 7443 carries the "Popular" badge.
The Extended Life section: 2 options from PHILIPS and WAGNER. PHILIPS 7444NALL is listed in this group.
LED (instant-on, long life, energy-saving): 1 part, from WAGNER. A representative part number is WAGNER 7443LEDW.
The Standard Replacement section: 2 options from WAGNER and GM GENUINE. WAGNER 7443 is listed in this group.
This group includes WAGNER 7443, PHILIPS 7444NALL and WAGNER 7443LL and the remaining parts above.
Buying Electrical Bulb & Socket Parts for a 2021 GMC Sierra 2500
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 Brake Light Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 2021 GMC Sierra 2500?
Our catalog currently lists 33 electrical bulb & socket parts for the 2021 GMC Sierra 2500 across 11 subcategories and 3 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 bulb & socket parts differ between 2021 GMC Sierra 2500 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 2021 GMC Sierra 2500?
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 2021 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 2021 GMC Sierra 2500?
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 2021 GMC Sierra 2500
Electrical Bulb & Socket Parts for Other GMC Sierra 2500 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.