2008 GMC Sierra Headlight Bulb Size
Low beam
H11
High beam
9005
Order
2 × H11 + 2 × 9005
Low beam takes a H11 and high beam takes a 9005 — different bulbs, two of each. They are not interchangeable.
The 2007–2013 Sierra uses these same bulbs — your 2008 sits in the middle of that run. See all Sierra years.
2008 GMC Sierra bulb chart
| Position | Bulb | Notes |
|---|---|---|
| Low beam | H11 |
Two bulbs, one per side. |
| High beam | 9005 |
Different bulb from low beam — not interchangeable. |
Verified against factory service data and OEM bulb references.
Parts that fit the 2008 GMC Sierra
Other vehicles that use the H11
These take the same low beam bulb, so the same bulb fits — only the housing differs.