2023 GMC Sierra 2500HD Bulb Sizes (Headlight, Tail, Fog)
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Quick reference
| Location | Bulb Size | Type/Notes |
|---|---|---|
| Low Beam | Varies | LED on most trims, Halogen H11 on WT/Pro trims |
| High Beam | Varies | LED on most trims, Halogen 9005 on WT/Pro trims |
| Fog Light | H11 | Halogen/LED dependent on trim |
| DRL (Daytime Running Light) | Varies | Integrated LED on most trims, sometimes share high beam |
| Front Turn Signal | 7440A or LED | Halogen or integrated LED |
| Rear Turn Signal | 7440 or LED | Halogen or integrated LED |
| Brake Light | 7443 or LED | Halogen or integrated LED |
| Tail Light | LED | Integrated LED |
| Reverse Light | 921 or LED | Halogen or integrated LED |
| License Plate | T10/194 or LED | Halogen or integrated LED |
| Side Marker | T10/194 or LED | Halogen or integrated LED |
| Dome/Map Light | 578 / 194 / 921 | Dependent on trim & specific fixture |
The 2023 GMC Sierra 2500HD offers a wide range of lighting configurations, primarily dictated by trim level. The base Work Truck (WT) and Pro trims typically feature traditional halogen bulbs for key lighting functions like low beams, high beams, and fog lights. As you move up to trims such as the SLE, SLT, AT4, Denali, and Denali Ultimate, you
More specs for the 2023 GMC Sierra 2500HD
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
2001 Sierra 2500HD
2002 Sierra 2500HD
2003 Sierra 2500HD
2004 Sierra 2500HD
2005 Sierra 2500HD
2006 Sierra 2500HD
Maintenance & repair guides
2023 GMC Sierra 2500HD 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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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-06-23.