
PIAA 18880 880 Xtreme White Plus
$58.60
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Used for: Fog Light Bulb Front
Used for: Headlight Bulb High Beam
Used for: Headlight Bulb Low Beam
Used for: Back Up Reverse Light Bulb
Used for: Brake Light Bulb, Tail Light Bulb
Used for: Center High Mount Stop Light Bulb
Used for: Daytime Running Light Bulb
Used for: License Plate Light Bulb, Roof Marker Light Bulb, Courtesy Light Bulb(Compare to original - Option 1), Glove Box Light Bulb, Instrument Panel Light Bulb(Compare to original - Option 2)
Used for: Parking Light Bulb, Turn Signal Light Bulb Front, Turn Signal Light Bulb Rear
Used for: Side Marker Light Bulb Front, Side Marker Light Bulb Rear
Used for: Ash Tray Light Bulb, Automatic Transmission Indicator Light Bulb, Instrument Panel Light Bulb(Compare to original - Option 1)
Used for: Check Engine Light Bulb, Courtesy Light Bulb(Compare to original - Option 2), High Beam Indicator Light Bulb, Instrument Panel Light Bulb(Compare to original - Option 3), Parking Brake Indicator Light Bulb, Turn Signal Indicator Light Bulb
Used for: Dome Light Bulb
Used for: Engine Compartment Light Bulb
Used for: Map Light Bulb(Compare to original - Option 1)
Used for: Map Light Bulb(Compare to original - Option 2)
Used for: Trunk or Cargo Area Light
This page lists the bulb sizes for the 2001 GMC Sierra 2500HD, organized by lighting position so you can quickly verify the correct replacement before you buy. Whether you are changing a headlight, a marker lamp, or a small interior bulb, checking the bulb chart by location helps reduce guesswork and makes it easier to match the right part to the right socket.
The 2001 GMC Sierra 2500HD uses a mix of exterior, interior, and dash indicator bulbs, and some positions may vary by trim, body style, or lighting package. Use the bulb sizes below to confirm fitment for the exact lamp you are replacing, especially if your truck has factory options such as fog lights, roof marker lights, or different interior lighting layouts.
For the best fit, compare the chart with the bulb already installed in your truck, since trim and package differences can affect certain positions. This is especially important when swapping halogen bulbs for LED replacements or when using aftermarket conversion kits, because the bulb base may fit but the beam pattern, polarity, or warning behavior can still differ. If you are unsure, remove the old bulb and check the number printed on the base before ordering a new one.
The low beam headlight bulb size listed for the 2001 GMC Sierra 2500HD is 9006.
The high beam headlight bulb size is 9005 for the 2001 GMC Sierra 2500HD.
The front turn signal bulb size listed is 3157A.
The parking light bulb size is 3157A.
The rear turn signal bulb size listed for this model is 3157A.
Both the brake light bulb and the tail light bulb are listed as 3157R.
The back up reverse light bulb size is 3157.
The center high mount stop light bulb size is 921.
The dome light bulb size listed is 211-2.
The license plate light bulb size is 194.
The glove box light bulb size is 194.
The roof marker light bulb size listed is 194.
The front side marker light bulb size is 194NA.
The rear side marker light bulb size is 194NA.
Yes. Some interior and dash positions show multiple compare-to-original options, including 168, 578, 2721, 161, and 194 depending on the specific location and configuration.
Yes. Trim, body style, and lighting package can change certain bulb applications, so it is smart to verify the installed bulb before buying a replacement.