2011 GMC Sierra 2500 HD Catalytic Converters

Genuine GM catalytic converters for the 2011 GMC Sierra 2500 HD, at wholesale prices. Converters are emissions parts, and the substrate loading has to match what the ECM expects from the downstream oxygen sensor. GMT900 HD through 2014, K2XX HD from 2015 to 2019, and the T1XX HD from 2020.

How you know

A P0420 code, rattling from underneath, or a failed emissions test. On a heavy duty pickup, single or dual rear wheels, gas or diesel, and cab configuration divide this group more than the model year does.

What you get ordering from us

• Genuine GM only. Every catalytic converters listing carries the original factory part number.
• Fitment checked by a person. Send the VIN and we verify the catalytic converters before the box leaves.
• Central shipping origin. Dallas keeps catalytic converters transit times short nationwide.
• Backed after the sale. If your catalytic converters does not work out, we make it right.

Confirming fitment

The cheapest version of a part is rarely the cheapest repair once labor is counted twice. The VIN decodes the build sheet, which is the only place option content is recorded reliably. We hold deep stock, so same day dispatch is the norm rather than the exception.