BMW 428i Back Up Light Bulb Size

The BMW 428i back up light requires a bulb size of 12177 for the rear lighting assembly. Data for the specified component covers the range from 2014 to 2016.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
2014-2016	12177

Bulb Specifications

Description	Bulb Size
Philips part number. Halogen bulb, specialty application. 12V.	12177

Other Locations

Additional Notes

The BMW 428i (2014-2016) uses the 12177 bulb for the back up light across all three model years covered in the specifications.
The 12177 is a Philips part number designating a halogen bulb rated at 12 volts for specialty automotive applications.
Halogen bulbs in this category produce light through a tungsten filament enclosed in a halogen gas environment, which extends filament life and maintains lumen output over time.
The 12V rating of the 12177 aligns with the standard electrical system voltage found in conventional passenger vehicles.
The consistent use of a single bulb size across the 2014-2016 model years indicates uniform back up light socket fitment within that production span for the 428i.
Because the 12177 is a specialty application bulb, it is not a general-purpose replacement type and substitution with physically similar but differently specified bulbs carries a fitment risk.