6T40 Valve Body, remanufactured and ready to install. Fits the 6T40. Ships fast from the USA.
The 6T40 runs in a wide span of GM's front-wheel-drive lineup - Chevrolet Cruze, Malibu, Equinox and Sonic, Buick Regal, Verano and Encore, and the GMC Terrain - across 2008 through 2019 production, and across that whole run the valve body is the part most likely to cause harsh shifts, slipping gears, or a transmission that drops into limp mode with a stored code. This listing is a remanufactured, bench-tested 6T40 valve body: every bore, solenoid connection and check valve is verified on a test stand before it ships, rather than sold as a used pull with unknown history.
Inside the 6T40 the valve body is the hydraulic brain of the unit - it routes line pressure through precision bores and spool valves to apply each clutch pack and band, and because this is an electronically controlled transaxle, the valve body also carries the shift and pressure-control solenoids the TCM uses to time every shift. A worn bore or a failing solenoid turns into a shift-quality complaint almost immediately, since there is no mechanical backup path once hydraulic control degrades.
General Motors' Preliminary Information PI0670A covers diagnostic steps for DTC P0776 and complaints of slipping in reverse, third or fifth across the 6T30/6T40/6T45/6T50 family, and separates a Gen 1 control strategy from the later Gen 2 revision - which matters because the fix differs by generation. Read our 6T40 common problems guide for the full list of failure patterns this platform is known for, and our shift solenoid symptoms guide if the complaint looks solenoid-specific rather than mechanical.
Because this listing covers the 6T40 broadly rather than one model year, fitment is the part to get right. Sonnax's own tech documentation for this family draws a hard line between the Gen 1 casting (identified by the eighth digit, pressure switch placement, and filter plate screens) and the Gen 2/3 castings, and states plainly that they do not interchange. Match your old unit's casting marks, connector count and pressure-switch layout against the listing photos before ordering, or send your year, make, model and VIN so we can confirm the correct revision for your vehicle - a mismatch here is the single most common return reason on this part. For a year-specific unit instead, the 6T40 valve body, 2010-2017 listing narrows the range.
Swap the fluid and filter in the same job so contamination from the old unit's wear never reaches the new valve body, torque the mounting bolts in the GM-specified sequence rather than corner to corner, and refill with DEXRON VI ATF. A filter and pan gasket kit built for this family covers that half of the job in one order, and pairing it with a fresh clutch module is worth considering if the original failure also chewed up the 1-2-3-4 clutch piston - a known weak point on this platform. Clear all codes and run the TCM's adaptive relearn after installation so the computer re-times clutch fill against the new unit rather than the one it replaced.
| Fits | 6T40 |
| Part type | Valve Body |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Remanufactured and bench-tested - every bore, solenoid connection and check valve is verified on a test stand before it ships.
It covers the 6T40 broadly across 2008-2019 production, but GM ran a Gen 1 casting that does not interchange with the later Gen 2/3 castings. Match connector count and casting marks against the photos, or send your VIN to confirm.
Chevrolet Cruze, Malibu, Equinox and Sonic, Buick Regal, Verano and Encore, and the GMC Terrain across 2008-2019, depending on engine and trim.
Harsh, late or flared shifts, slipping between gears, torque converter clutch shudder, and limp mode with a stored solenoid or ratio code.
DEXRON VI ATF.
A filter and pan gasket kit at minimum, and a clutch module if the original failure also damaged the 1-2-3-4 clutch piston - a known weak point on this platform.
