GMC Sierra Fog Light Bulb Size

GMC Sierra front fog light bulbs utilize 3 distinct sizes: 5202, 9145, and 880, with each bulb size corresponding to specific vehicle production configurations. The replacement chart documents bulb specifications across the 1999 to 2020 model range.

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

Front Fog Light

Years	Bulb Size
2016-2020	5202 (3500 HD only)
2007-2015	5202
2003-2006	9145 (1500 only)
1999-2002	880

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament halogen bulb with PG20-3 base. 12V, 24W.	5202
ANSI standard (US & Canada). Single-filament halogen bulb with PY20d base. 12V, 42W.	9145
ANSI standard (US & Canada). Single-filament halogen bulb with PG13 base. 12V, 27W.	880

Other Locations

Additional Notes

The GMC Sierra front fog light specifications cover model years 1999 through 2020 and reference three distinct bulb sizes: 5202, 9145, and 880.
The 5202 is the most widely used bulb across these specifications, appearing in Sierra front fog light positions from 2007 through 2020. It is an ANSI-standard single-filament halogen bulb rated at 12V and 24W, fitted with a PG20-3 base.
For model years 2016-2020, the 5202 bulb applies exclusively to the 3500 HD trim. This trim-specific restriction means not all Sierra configurations within those years share the same front fog light bulb.
The 9145 bulb is specified for the GMC Sierra 1500 only during model years 2003-2006. It carries a PY20d base and operates at 12V and 42W, making it the highest-wattage bulb among the three types listed in these specifications.
The 880 bulb is specified for model years 1999-2002 without any trim restriction noted. It uses a PG13 base and is rated at 12V and 27W.
All three bulb types, the 5202, 9145, and 880, conform to ANSI standards applicable in both the United States and Canada, and all are single-filament halogen designs operating on a 12V system.
Despite sharing the same halogen technology and voltage rating, the 5202, 9145, and 880 each use a different base type, PG20-3, PY20d, and PG13 respectively. These bases are not interchangeable, as each is physically distinct in its socket design.
The wattage difference between the 9145 at 42W and the 5202 at 24W is substantial. Substituting one for the other would be electrically incompatible and is not supported by these specifications.
The trim-level qualifiers present in the 2003-2006 and 2016-2020 entries indicate that Sierra configurations outside those specified trims are not covered by those particular bulb size entries for those years.
The transition from the 880 bulb in 1999-2002 to the 9145 in 2003-2006 and then to the 5202 from 2007 onward reflects three separate base and wattage configurations across the Sierra's front fog light history in these specifications.