2011 GMC Sierra 2500 HD Alternators

Genuine GM alternators for the 2011 GMC Sierra 2500 HD, at wholesale prices. Alternator output rating varies by electrical load, so a truck with a tow package or upfit wiring takes a different unit. GMT900 HD through 2014, K2XX HD from 2015 to 2019, and the T1XX HD from 2020.

What sends people here

A battery light, dimming headlights at idle, or a no-start after a short drive. On a heavy duty pickup, two trucks with the same badge can take different parts once cab style and drivetrain are accounted for.

Buying OEM, briefly

• Factory warranty. Genuine alternators carry GM coverage aftermarket cannot match.
• Dealer parts, not dealer prices. Compare our alternators pricing against a counter quote.
• Genuine GM only. Every alternators listing carries the original factory part number.
• Fitment checked by a person. Send the VIN and we verify the alternators before the box leaves.
• Central shipping origin. Dallas keeps alternators transit times short nationwide.

Before you order

Factory parts are built to the tolerances the vehicle was engineered around, not copied from a worn sample. A photo is rarely enough to order from. The VIN takes seconds and removes the guesswork. Freight is quoted at what it actually costs, not inflated to subsidize a headline discount.