The filter and pan gasket the GM 6L80 needs at every fluid service, matched to OE filtration and flow so the new fluid stays clean and the pan seals leak-free.
The ATP B-239 is the routine service kit for a GM 6L80: one pan filter and one pan gasket, the two parts you need every time the fluid gets changed on a Silverado, Sierra, Tahoe, Suburban, Yukon, Avalanche, Camaro or Escalade with the six-speed. If you are searching because the truck has a lazy upshift, a faint pump whine, or simply 50,000 miles on the original fluid, this is where the fix starts. ATP builds the B-239 to OE filtration and flow, which matters on this transmission more than most.
Everything the 6L80 does runs through its pump, and the pump only sees fluid that has passed through this filter. Downstream sits the valve body and the transmission control module, mounted together inside the case and bathed in the same fluid. Clutch material and fine wear metal circulate constantly, and the filter's job is to catch them before they score the pump or hang a valve. The catch is that a filter too restrictive for the pump starves it, and on the 6L80 that shows up as low line pressure and soft shifts. That is why matching OE flow, not just OE fit, is the spec to care about. The gasket replaces the original once it has hardened or taken a set and started seeping down the case.
Pull the fluid sample at the check plug. Dark, burnt-smelling fluid with fine debris says service it now. Scan for codes too: a P0716, P0717 or P0751 points at the input speed sensor circuit or the valve body and module, not the filter. If the fluid is fine and the shifts are still off, line pressure and the valve body are next. Our 6L80 high-mileage service checklist lays out that order, and the 6L80 service guide covers the fluid check itself.
The B-239 is listed for the GM 6L80 six-speed in the Silverado, Sierra, Tahoe, Suburban, Yukon, Avalanche, Camaro and Escalade, among others. The 6L80 was used across roughly 2006 to 2020 and in more than one pan depth, and GM's own 6L90 and some aftermarket deep pans can call for a different filter length. Confirm RPO code MYC on the glovebox or door label, check your pan type, and match year, make, model and engine. If you are unsure, send us your year and VIN. Every 6L80 part we carry is on the 6L80 shop page.
The listing recommends this service every 45,000 to 60,000 miles, and sooner on a truck that tows.
| Fits | GM 6L80 six-speed (Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade, Camaro) |
| Includes | Transmission pan filter and reusable-style pan gasket |
| Filter | OE-level filtration and fluid flow |
| Part number | ATP B-239 |
| Service interval | Every 45,000-60,000 miles, sooner if towing |
| Note | Verify year, make, model, and engine for fitment |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The kit is listed as the filter and pan gasket. GM requires a new neck seal any time the filter is removed, so check the new filter for a seal and remove the old one from the case bore before you install it.
The listing recommends every 45,000 to 60,000 miles, sooner for towing. If the fluid is dark or the truck shudders, do it now regardless of mileage.
No. P0751 is a shift solenoid performance code tied to the valve body and control module. A filter service will not clear it, though low or dirty fluid should be ruled out first.
Dexron VI. GM's 2012 Silverado owner manual lists 5.7 liters (6.0 quarts) for a 6L80-E pan and filter service. Set the final level hot at the check plug.
It is listed for the 6L80. The 6L90 uses a different, deeper pan and filter, so confirm your RPO code (MYC is the 6L80, MYD is the 6L90) before ordering.
