2021 GMC Acadia Bulb Sizes (Headlight, Tail, Fog)
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 Headlight | H11 | Halogen (some trims use LED OEM) |
| High Beam Headlight | H9 | Halogen (some trims use LED OEM) |
| Fog Light | H16 | Halogen (some trims use LED OEM) |
| DRL | Integrated LED (some trims use LED OEM) | |
| Front Turn Signal | WY21W | Halogen (some trims use LED OEM) |
| Rear Turn Signal | 7440NA | Halogen |
| Brake Light | 7443 | Halogen |
| Tail Light | 7443 | Halogen |
| Reverse Light | 7440 | Halogen |
| License Plate | 194 | Halogen |
| Front Side Marker | WY5W | Halogen |
| Rear Side Marker | W5W | Halogen |
| Dome Light | 578 | Halogen |
| Map Light | 194 | Halogen |
For the 2021 GMC Acadia, lighting can vary significantly depending on the trim level. Lower trims generally utilize traditional halogen bulbs for most exterior lighting, while higher trims (such as SLT, Denali) often come equipped with OEM LED headlights, fog lights, and even turn signals. It is crucial to check your specific vehicle's lighting configuration to determine the exact bulb type and size before purchasing replacements or upgrades.
LED vs Halogen Upgrade Considerations
Upgrading from halogen to LED bulbs in your 2021 GMC Acadia can offer significant improvements in brightness, longevity, and a more modern aesthetic. However, there are several factors to consider:
- CANBUS Errors: Many modern vehicles, including the Acadia, use a CANBUS (Controller Area Network Bus) system to monitor the electrical resistance of various components, including lighting. LED bulbs draw significantly less power than halogens, which can trick the CANBUS system into thinking a bulb is out, triggering a
More specs for the 2021 GMC Acadia
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
2021 GMC Acadia 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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