The 2021 Ram 4000 has 6 electrical bulb & socket parts with verified fitment on this page — 6 part types and 1 brand, covering both the 5.7L V8 and the 6.4L V8. Each part includes a manufacturer part number and application notes.
On the 2021 Ram 4000, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination. 3 parts of the 6 listed are Back Up / Reverse Lamp Bulb (1 part), License Plate Lamp Bulb (1 part) and Map / Reading Light Bulb (1 part). The other 3 part types cover the remaining 3 parts.
The 2021 Ram 4000 was sold with both the 5.7L V8 and the 6.4L V8. All 6 parts on this page fit every engine.
Every electrical bulb & socket part listed for the 2021 Ram 4000 comes from PHILIPS.
Each part number listed for the 2021 Ram 4000 opens a page with every vehicle that part fits.
Back Up / Reverse Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: all 2021 4000 engines | 1156LL | 🇲🇽 MX | Longer Life | 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.
One part is listed for the 2021 Ram 4000 — PHILIPS 1156LL.
License Plate Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: all 2021 4000 engines | 1157WLED | 🇲🇽 MX | Ultinon LEDWhite | 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.
One part is listed for the 2021 Ram 4000 — PHILIPS 1157WLED.
Map / Reading Light Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: all 2021 4000 engines | 2122 | 🇲🇽 MX | View on Amazon |
This table covers the bulbs in the map / reading 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 2021 Ram 4000 — PHILIPS 2122.
Parking Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: all 2021 4000 engines | 7444NALL | 🇲🇽 MX | Longer LifeNatural Amber | 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.
This group shows a single part: PHILIPS 7444NALL.
Roof Marker & Identification Light Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: all 2021 4000 engines | 194NALL | 🇲🇽 MX | Longer LifeNatural Amber | View on Amazon |
This table covers the replacement bulbs for the Roof Marker & Identification 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: PHILIPS 194NALL.
Turn Signal Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: all 2021 4000 engines | 7444NALL | 🇲🇽 MX | Longer LifeNatural Amber | 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 2021 Ram 4000 — PHILIPS 7444NALL.
Buying Electrical Bulb & Socket Parts for a 2021 Ram 4000
On this vehicle, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination.
- You do not need to pick an engine: every electrical bulb & socket part on this page fits both the 5.7L V8 and the 6.4L V8.
- 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 License Plate Lamp Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 2021 Ram 4000?
Our catalog currently lists 6 electrical bulb & socket parts for the 2021 Ram 4000 across 6 subcategories and 1 brand, covering both the 5.7L V8 and the 6.4L V8. Each part is matched to the engine(s) it fits.
Do electrical bulb & socket parts differ between 2021 Ram 4000 engines?
No. On this page every electrical bulb & socket part fits both the 5.7L V8 and the 6.4L V8. You do not need to pick an engine to choose the right row — use the notes for position and trim.
What are the signs of electrical bulb & socket problems on a 2021 Ram 4000?
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 Ram 4000 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 Ram 4000?
Every part on this page already fits both the 5.7L V8 and the 6.4L V8. 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 Ram 4000
Electrical Bulb & Socket Parts for Other Ram 4000 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.