8L90 Tcc Solenoid, remanufactured and ready to install. Fits the 8L90. Ships fast from the USA.
The 8L90 behind GM's V8 trucks, SUVs and performance cars earned its shudder reputation through the torque converter clutch, so the TCC solenoid gets a lot of attention when a Silverado, Sierra, Tahoe, Yukon, Escalade or Corvette starts slipping at cruise or throws a converter code. This remanufactured solenoid carries reference number 24272280 and is a lower-cost way to replace an S7 solenoid that has actually failed.
The 8L90 is the heavy-duty version of GM's 8-speed, and the converter clutch is what keeps a big V8 from heating the fluid on every highway mile. Lockup is commanded through S7, one of seven variable force pressure control solenoids on the control valve body. It is normally low, meaning no current equals no apply. The TCM ramps current to build signal pressure, which positions the S7 clutch control valve and meters apply oil to the converter. Because the control is variable rather than on/off, the TCM can bring the clutch in progressively, and that is exactly why fluid condition and solenoid accuracy matter so much on the 8L90.
GM's bulletin 18-NA-355 describes a shudder like driving over rumble strips at 25-80 mph on 8L90 RPOs M5U and M5X, names TCC shudder as the cause, and corrects it with a complete fluid exchange to Mobil 1 Synthetic LV ATF HP, GM 19417577. The bulletin says to do it only once per vehicle and to diagnose further if the shudder returns. GEARS Magazine warns against older bottles of the earlier fluid as well. So if your 8L90 has never had the exchange and the only complaint is shudder, do that first. If you have a hard code, measure the solenoid: 4.5-5.5 ohms is the published range. Our 8L90 common problems guide covers this decision in detail.
This remanufactured listing has no year range attached, so the 24272280 reference is how you match it. The same number is used in the 8L45. Pull the old solenoid, read its number and compare the connector, or send us the year and VIN before ordering. A new version for 2017-and-later units is listed as the 8L90 TCC solenoid 2017. Every other 8-speed part we stock is on the 8L90 parts page.
Access is through the pan at the control valve body. Mark connector positions; Sonnax notes the S4 and TCC solenoids have compatible connectors and swapping them leaves the truck in neutral on the 1-2 shift. Use a new O-ring and inspect the S7 bore and its signal accumulator, since a worn bore will keep slipping the converter even with a good solenoid. GM TechLink lists a 7.0-liter (7.4 qt) fluid change for the 8L90; refill with DEXRON HP licensed fluid and check level per the factory hot-check procedure. Trucks that tow should also have a healthy cooler bypass, and the 8L90 thermal bypass valve upgrade is a common add-on. Load the solenoid characterization to the TCM with GM programming, then verify lockup on a highway drive.
| Fits | 8L90 |
| Part type | Tcc Solenoid |
| Condition | Remanufactured |
| Brand | OEM |
| Reference | 24272280 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 8L90 is used behind V8 engines in GM full-size trucks and SUVs such as the Silverado, Sierra, Tahoe, Yukon and Escalade, plus the Corvette and Camaro. Match the 24272280 reference or send your VIN to confirm.
For shudder with no code, do the complete Mobil 1 LV ATF HP exchange from GM bulletin 18-NA-355 first. Replace the solenoid for a TCC code, a bad resistance reading, or shudder that returns after the exchange.
GM TechLink lists 7.0 liters (7.4 quarts) for an 8L90 fluid change. A full exchange to correct shudder uses more, because it is flushed until the old fluid is out.
Check the S7 clutch control valve bore and signal accumulator for wear, and make sure the TCC and S4 connectors were not swapped. Sonnax documents both as causes of no-apply or high slip.
GM's procedure is to download the solenoid characterization data to the TCM after replacing solenoids so lockup and shift control are calibrated to the new part.
