2018 Ram ProMaster Bulb Sizes, Replacement Guide, & Common Issues
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick Reference
| Location | Bulb Size | Type |
|---|---|---|
| Low Beam | H11 | Halogen |
| High Beam | H9 | Halogen |
| Fog Light | 9006 | Halogen |
| DRL | 2825 / W5W | Halogen (Integrated in turn signal) |
| Front Turn Signal | WY21W | Halogen |
| Rear Turn Signal | 7440A | Halogen |
| Brake Light | 7443 | Halogen |
| Tail Light | 7443 | Halogen |
| Reverse Light | 7440 | Halogen |
| License Plate | 168 | Halogen |
| Front Side Marker | 2825 / W5W | Halogen |
| Rear Side Marker | 2825 / W5W | Halogen |
| Dome/Map Light | 578 | Halogen |
The 2018 Ram ProMaster, a popular choice for businesses and DIY adventurers alike, primarily utilizes halogen bulbs across its lighting system. There are no OEM LED headlight or fog light options for this model year. All trim levels, from the 1500 to the 3500, share the same bulb specifications for the exterior and interior lighting components.
OEM Halogen vs. Aftermarket LED
As noted above, all factory lighting on the 2018 Ram ProMaster is halogen. This means that if you're looking for the brighter, more energy-efficient light of LEDs, you'll need to venture into the aftermarket. While the initial investment might be higher, LED upgrades can offer significant improvements in visibility and a longer lifespan.
LED vs. Halogen Upgrade Considerations
Upgrading your 2018 Ram ProMaster's halogen bulbs to LEDs can drastically improve visibility and modernize its appearance. However, there are a few important considerations:
CANBUS Errors
The ProMaster's electrical system, like many modern vehicles, uses a Controller Area Network (CANBUS) system to monitor various components, including your lights. When you switch from halogen to LED bulbs, the lower power draw of LEDs can sometimes trigger a
More specs for the 2018 Ram ProMaster
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2018 Ram ProMaster Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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