Most 2014 Sierra 1500s with halogen headlights use H11 for low beams, 9005 for high beams, and H11 for fog lights if equipped; taillights and turn signals typically use bulbs in the 3157 family, and backup lights commonly use a small wedge in the 921 family. Exact sizes can vary by trim and options, so check your manual or the door jamb bulb chart for your specific truck.
The Sierra 1500 offered multiple headlight configurations across trim levels, including halogen projector options and available HID headlights on higher trims. Because bulb sizes change with configuration, obtaining the precise part numbers for your exact build is important before purchasing replacements.
Common bulb sizes by system
Below is a general guide to bulb sizes you are likely to encounter on a 2014 Sierra 1500 with halogen headlights. If your vehicle has HID or LED headlights, the replacement approach and bulb types are different and not covered in this list.
- Low-beam headlights: H11
- High-beam headlights: 9005
- Fog lights (if equipped): H11
- Taillights and brake/turn signals: 3157 family bulbs (3157 or 3157A, depending on the lens design)
- Backup lights: common sizes are 921 wedge-type bulbs, though some setups may use 912 or other wedge styles; verify for your exact truck
Note: The exact bulb arrangement and numbers can vary by trim level (work truck, SLE, SLT, Denali) and by whether the vehicle includes fog lights or HID headlights. Always double-check against your owner's manual or a trusted parts database for your exact VIN.
How to verify the exact bulb sizes for your Sierra
Since GM used several headlight configurations across the 2014 Sierra 1500 lineup, confirming the precise bulb sizes for your truck is best done by checking the official sources or inspecting the specific label on your vehicle.
- Consult the owner's manual's "Bulbs" or "Specifications" section for the exact part numbers and bulb types for your trim.
- Look inside the driver's door jamb or the headlight housing for a bulb-size sticker or a code that GM uses to identify the bulb type.
- Check a current GM Parts catalog or a reputable automotive parts retailer’s site by entering your VIN or exact trim to pull the bulb sizes.
- If you have access to the old bulb, remove it carefully and compare it to the listed sizes, or bring it to an auto parts store for a match.
Conclusion: While many 2014 Sierra models with halogen headlights follow a pattern of H11 low beams, 9005 high beams, H11 fogs, and 3157-series taillights/turn signals, the best method to confirm is to consult the manual or a parts catalog for your exact vehicle. This ensures you buy the correct replacement bulbs for your trim and options.
Summary
The 2014 GMC Sierra 1500 uses a mix of bulb sizes depending on the configuration. Common halogen setups generally include H11 for low beams, 9005 for high beams, H11 for fog lights if equipped, and 3157-series bulbs for taillights and turn signals, with backup lights typically using a 921 wedge bulb. Because trim and options influence exact sizes, always verify with the owner's manual or a reliable parts resource for your specific vehicle before replacing bulbs.