Converter type
GM Truck catalytic converters
GM truck units come off full-size Silverado, Sierra, Express and Savana models, including the 6.0-liter heavy-duty trucks, and carry an eight-digit GM number usually starting 12, 15 or 25.
We pay for this type
$55 to $511
Large GM category. Updated October 1, 2026. Final price on inspection.
Get a quote for yoursHow to find the code
The code is stamped into the shell or a welded plate, usually near a flange. Wipe the surface and photograph it straight on in daylight. If two sections are welded together, photograph both.