6T70 Solenoid Kit 2008, remanufactured and ready to install. Fits the 6T70. Ships fast from the USA.
A 2008 model is one of the earliest 6T70-family transmissions on the road, fitted to vehicles like the GMC Acadia, Buick Enclave and the V6 Chevrolet Malibu. After this many miles, the most common electrical complaints are pressure switch codes, solenoid performance codes, and a transmission that defaults to one gear and stays there until the key is cycled. This listing is the remanufactured first-generation TEHCM for that 2008 build: the solenoid body with its control solenoids and the built-in transmission control module, ready to bolt in once you have confirmed the fault.
On a first-generation unit the assembly does two jobs. The module fires the solenoids that move oil to each clutch, and it also reads four pressure switches mounted in the same assembly. Those normally closed switches tell the module that a clutch circuit actually received pressure when commanded. Sonnax's write-up on these switches explains why that matters: if a switch reports the wrong state, the module assumes a hydraulic failure, sets a code and drops to limp mode to protect the clutches - even when the clutch itself is fine. GM removed the switches when the second generation arrived for 2013, so this monitoring logic, and its failure mode, belong to the early units like yours.
2008 sits squarely in the range affected by GM bulletin 09-07-30-012F, the broken 3-5-Reverse wave plate. That failure sets P0776 and takes out reverse, third and fifth together, and replacing the control assembly will not cure it. GM also extended coverage on that repair for early model years, so check your VIN with a dealer first. If your codes are pressure switch or solenoid codes instead, scan all modules, check the fluid level hot, and run a line pressure test. Our 6T70 shift solenoid guide explains which solenoid controls which clutch, and the Acadia common problems guide covers the wave plate and solenoid failures side by side.
This assembly is for 2008 6T70 applications only, which are first-generation transmissions. A 2013-or-later assembly will not work properly in this car even if it programs, and Sonnax specifically warns against picking a replacement only by copying the number off the old module, because previous repairs sometimes installed the wrong one. Confirm your build with the M-series transmission RPO code from the Service Parts Identification label in the glove box, and send your VIN with the order so we can check the match. If your vehicle is a later year, see the 2008-2017 solenoid kit, or browse the full 6T70 parts collection.
If the wave plate is already broken, the transmission is coming apart, and a 6T70 pump for early units plus a first-generation shift kit are worth doing while it is open.
| Fits | 6T70 2008 |
| Part type | Solenoid Kit |
| 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.
2008 is a first-generation 6T70 with pressure switches inside the control assembly. Later second-generation assemblies do not have them and will not work properly in a 2008.
No. That pattern is the broken 3-5-Reverse wave plate described in GM bulletin 09-07-30-012F. It is an internal repair, and GM extended coverage on it for early units, so check with a dealer using your VIN first.
They mean the module saw a pressure switch state that did not match what it commanded. The cause can be the switch, a leaking seal, or low circuit pressure, so confirm with a line pressure test before replacing the assembly.
Yes. It has to be programmed to your VIN with a J2534 pass-thru device or dealer tool, followed by the Service Fast Learn adapt procedure.
Early applications included the GMC Acadia, Buick Enclave and V6 Chevrolet Malibu. Send your VIN and we will confirm your transmission before shipping.
