6T30 Valve Body 2013-2018, remanufactured and ready to install. Fits the 6T30. Ships fast from the USA.
The 6T30 is the lightest-duty member of GM's six-speed front-drive 6T family, found in small cars such as the Chevrolet Sonic and some Cruze models depending on engine. If your 2013-2018 car slips going into reverse, flares into 3rd or 5th, shifts hard once it is warm, or keeps lighting the check engine light with pressure control solenoid codes, a worn valve body is one of the first things to check. This is a remanufactured 6T30 valve body for the 2013-2018 model years, the era after GM moved most of these cars to its second-generation transmission controls.
On the 6T30 the control module and solenoids are not separate parts under the dash. GM calls the assembly the TEHCM, and it bolts directly to the valve body inside the transmission. The TEHCM decides when to shift, but it is the valve body that does the work: each pressure control solenoid sends a small signal, and a matching regulator valve in the valve body turns that into apply pressure for its clutch. Sonnax's Gen 2 install sheet lists the solenoids by circuit: line pressure, 2-6, 3-5-Reverse, the converter clutch, 1-2-3-4, and Low/Reverse 4-5-6, plus one on/off shift solenoid. A worn regulator bore leaks that apply pressure away, so the clutch it feeds slips or engages late even though the solenoid itself is fine.
A 3-5-Reverse complaint on this family is not always the valve body. GM's preliminary information PI0670A, which covers 6T30, 6T40, 6T45 and 6T50 cars with P0776 and slipping in reverse, 3rd or 5th, tells technicians to inspect the valve body, the pump, the 3-5-R housing and the 3-5-R clutch piston before condemning the TEHCM, and warns that air checking the 3-5-R clutch through the case is not reliable. A cracked 3-5-R wave plate is a known failure in these units and produces the same slip. Check the hot fluid level at the check plug, look for a calibration update, and measure the solenoids. Our 6T40 family valve body symptoms and testing guide covers the full test order, and our delayed engagement guide helps with a slow reverse or drive engagement.
This listing is for the 6T30 in 2013-2018 vehicles. GM's PI0670A shows that some 2012 cars, such as the Cruze and Sonic with the 1.8L, still used Gen 1 controls while others had already moved to Gen 2, and Sonnax warns that Gen 1 valve bodies cannot be interchanged with Gen 2 units. Most 2013-2018 6T30 applications are Gen 2, but do not assume. Match the casting, the TEHCM connector and the pressure switch layout on your old valve body, or send your year and VIN and we will confirm it fits before it ships. If your car needs only solenoids rather than a full valve body, see our 6T30 solenoid kit, and for a lower-cost used option covering more years there is the 6T30 valve body for 2010-2019.
Drain the fluid, remove the side cover, and lift out the TEHCM and valve body as an assembly. Fit new valve-body-to-case gaskets on the separator plate, start every bolt by hand, and tighten in the factory sequence; on Gen 2 units Sonnax lists 97 in-lb for the valve body to case bolts, with lower values for the solenoid body bolts. Refill with Dexron VI to the level at the check plug with the fluid near operating temperature, then reset the transmission adaptives with a scan tool and drive through 10-15 upshift and downshift cycles. A slight flare or clunk during that first drive is normal while the TEHCM relearns. Since debris from the old unit is still in the case, replace the filter at the same time with a 6T40/6T45 filter and gasket kit, and if the 3-5-R clutch was the real problem, a 6T30 master rebuild kit covers the seals and frictions.
| Fits | 6T30 2013-2018 |
| 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.
This listing covers 2013-2018 6T30 applications, which includes the Sonic. Because GM used both Gen 1 and Gen 2 controls in this family and they do not interchange, check the casting and connector on your current valve body or send your VIN so we can confirm before shipping.
On this family the TEHCM bolts to the valve body and is typically transferred from your old assembly. Inspect the connector and solenoid terminals carefully, because they bend easily, and follow your service information if any solenoids need replacement.
No. GM's guidance for P0776 on the 6T30 through 6T50 is to inspect the valve body, pump, 3-5-R housing and the 3-5-R clutch piston, and a cracked 3-5-R wave plate causes the same symptom. Confirm the clutch is healthy before replacing only the valve body.
Use Dexron VI. The 6T30 has no dipstick; the level is set at the check plug with the engine running and the fluid near operating temperature.
Yes. Reset the transmission adaptive values with a scan tool, then drive through 10-15 upshift and downshift cycles. Minor flares or clunks during that first drive usually clear up as the module relearns.
