2020 GMC Sierra 1500 Bulb Sizes
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Quick Reference
| Location | Bulb Size | Type |
|---|---|---|
| Low Beam | H11 | Halogen (LED on higher trims) |
| High Beam | 9005 | Halogen (LED on higher trims) |
| Fog Light | H16 | Halogen (LED on some trims) |
| DRL | 7443 | Halogen (LED on higher trims) |
| Front Turn Signal | 7444NA | Halogen (LED on higher trims) |
| Rear Turn Signal | 3157 | Halogen (LED on higher trims) |
| Brake Light | 3157 | Halogen (LED on higher trims) |
| Tail Light | 3157 | Halogen (LED on higher trims) |
| Reverse Light | 7440 (or 921) | Halogen (LED on higher trims) |
| License Plate | 194 | Incandescent (LED on some trims) |
| Front Side Marker | 194 | Incandescent (LED on some trims) |
| Rear Side Marker | 194 | Incandescent (LED on some trims) |
| Dome/Map Light | 578 / 212-2 | Incandescent (LED on some trims) |
The 2020 GMC Sierra 1500 offers a variety of lighting configurations depending on the trim level, ranging from traditional halogen setups to advanced full-LED systems. This guide will help you identify the correct bulb sizes for your specific truck.
Headlights
For base models of the 2020 GMC Sierra 1500, the low beam headlights typically use an H11 halogen bulb, and the high beam headlights use a 9005 halogen bulb. Higher trim levels, such as the SLT, AT4, and Denali, often come equipped with factory LED projector headlights for both low and high beams. These integrated LED units are not designed for individual bulb replacement within the housing. If you're unsure, visually inspect your headlights or consult your owner's manual.
Fog Lights
Most 2020 Sierra 1500 models utilize an H16 halogen bulb for the fog lights. However, certain premium trims might feature integrated factory LED fog lights that are not user-serviceable with a standard bulb replacement.
Daytime Running Lights (DRL)
The Daytime Running Lights (DRL) on models with halogen headlight setups commonly use a 7443 bulb. Trucks equipped with factory LED headlights will have integrated LED DRLs that are part of the headlight assembly.
Turn Signals
Both the front turn signals and rear turn signals on halogen-equipped models typically use a 7444NA (front) or 3157 (rear) bulb. The "NA" in 7444NA signifies "Natural Amber," as these bulbs are designed for amber light output. As with other lighting, higher trims may feature integrated LED turn signals within the main light assemblies.
Brake, Tail, and Reverse Lights
For vehicles with incandescent rear lighting, the brake lights and tail lights usually share the same 3157 dual-filament bulb. This bulb provides both the dim tail light function and the brighter brake light function. The reverse lights commonly use a 7440 or 921 bulb, though the 7440 is more frequently found in the Sierra 1500. Again, factory LED taillight assemblies on premium trims will have integrated LED components.
Auxiliary Lighting
License plate lights and side marker lights typically utilize a smaller 194 incandescent bulb. Many owners choose to upgrade these to LED for a brighter, more modern look. Interior dome and map lights often use a 578 or 212-2 style
More specs for the 2020 GMC Sierra 1500
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
2020 GMC Sierra 1500 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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