For most 2012 Impalas with standard halogen headlights, the low beams use H11 bulbs and the high beams use 9005 bulbs. If your car is equipped with HID headlights or an aftermarket upgrade, the bulb types will be different and depend on the ballast. Always verify with your owner's manual or a parts diagram before purchasing.
Halogen headlights: standard setup
Here's what to expect if your Impala uses halogen lamps as originally equipped by GM in that year.
Common halogen bulb sizes for the Impala's headlamps are:
- Low beam: H11
- High beam: 9005 (HB3)
When replacing halogen bulbs, choose reputable brands and consider upgrading to bulbs that offer higher lumens and cooler color temperatures. Always handle bulbs with clean gloves to avoid oil contamination on the glass, which can shorten bulb life.
HID and other upgrades
If your Impala came with HID headlights, or you upgraded to HID, the bulbs will not be H11/9005. HID systems use ballast-and-bulb combinations such as D2S or D3S that match the factory ballast. Check the ballast label or your owner's manual to confirm the exact bulb type.
Typical HID bulb types you might encounter on GM vehicles from this era include D2S and D3S. Do not attempt to insert non-HID bulbs into an HID system, and ensure you purchase the correct bulb type for your ballast, or use a compatible aftermarket kit if you are upgrading.
To verify the precise bulb type for your car, consult the service manual, check the current bulbs in place, or look at the label on the ballast or headlight assembly. If in doubt, a local auto parts store can read your VIN and confirm the exact bulb type for your trim and options.
How to confirm your configuration
Use these quick checks to determine which system your Impala has:
- Inspect the headlight housing: halogen assemblies typically use replaceable H11 and 9005 bulbs; HID assemblies usually have a ballast and a D2S/D3S-type bulb with different connectors.
- Check the owner’s manual or window sticker for the headlight type; if the manual lists "halogen" or shows H11/9005, you have a halogen setup. If it mentions HID, you have an HID setup.
- Remove one bulb carefully to read the markings on the base; the bulb's model number will be printed on the base (for example H11, 9005, D2S, D3S, etc.).
Summary
The majority of 2012 Chevy Impalas with halogen headlights use H11 for the low beams and 9005 for the high beams. If your vehicle has HID headlights, use the HID bulbs (commonly D2S or D3S) that match your ballast. Always verify with the owner's manual or the ballast label to ensure you purchase the correct bulb for your exact trim and options.