8L45 Valve Body 2014-25, remanufactured and ready to install. Fits the 8L45. Ships fast from the USA.
A 2015-2023 Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Camaro, Corvette, or Cadillac with the 8-speed 8L45 or 8L90 automatic that shudders on light throttle around highway speed, bangs through the 1-2 or 2-3 shift, or throws a pressure or shift-solenoid code is usually pointing at the valve body before anything else. This remanufactured 8L45 valve body covers listings built for 2014-25 and replaces the whole hydraulic and solenoid assembly as a unit rather than chasing one worn bore at a time.
The 8L45 shares its architecture with the heavier-duty 8L90, built around a chain-driven, off-axis pump and a bank of pressure and shift-control solenoids mounted directly on the valve body. Those solenoids turn the transmission control module's commands into the actual clutch and torque-converter-lockup pressures that move the truck or car through eight gears. Published technical notes on this platform trace wear to the signal accumulator piston bores and the pressure regulator circuits, and both fail the same way: line pressure drifts out of spec and every shift that depends on it gets rough.
GM issued service bulletin 18-NA-355 specifically for the 25-80 mph shudder complaint on these transmissions, and the fix starts with a fluid change to Mobil 1 Synthetic LV ATF HP before any hard parts come off. If a fresh fluid change doesn't clear the shudder, or you're also seeing solenoid or pressure codes, the valve body is the next suspect - our 8L90 Valve Body Symptoms and Testing guide breaks down which stored codes point at which internal circuit. A shop can also confirm with a pressure test rather than a code scan alone, since worn accumulator bores show up as pressure drifting under load even with no fault stored yet.
This listing covers the 8L45 as built from 2014 through 2025, which spans both the 8L45 (RPO M5T/M5N) and the related 8L90 (RPO M5Q/M5X) used across Chevrolet Silverado, Tahoe, Camaro, Corvette, and Colorado, and GMC Sierra, Yukon, and Canyon, plus Cadillac applications. These units share a valve body family but were tuned differently across model years and RPO codes, so match your RPO code or send your year, make, model, and VIN rather than ordering on year alone - our 8L90/8L45 parts page lists the rest of what we stock for this platform if you need to cross-check another part.
Drop the pan and replace the filter at the same time you install this valve body - debris from the failed unit will contaminate a new one within the first few miles if the old fluid and filter stay in the pan. Refill with Mobil 1 Synthetic LV ATF HP, the fluid GM specifies for this platform, and torque the valve body bolts in the documented sequence rather than a spiral pattern so the casting doesn't warp. This is an adaptive transmission, so run the TCM relearn procedure after the swap; expect firmer shifts for the first several miles while it resets. If the solenoids are original and have real mileage on them, pairing this job with our 8L90 Valve Body Solenoid Kit or the 8L90 Transmission Valve Body Shudder Fix Kit addresses the shudder failure mode directly instead of reinstalling worn solenoids on a new casting.
| Fits | 8L45 2014-25 |
| Part type | Valve Body |
| Condition | Remanufactured |
| Brand | OEM |
| Reference | 24044716 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 8L45 and related 8L90 cover 2015-2023 Chevrolet Silverado, Tahoe, Camaro, Corvette, and Colorado, plus GMC Sierra, Yukon, and Canyon and Cadillac applications. Match your RPO code or VIN rather than year alone, since GM tuned the two units differently.
GM's own service bulletin 18-NA-355 points to torque converter clutch shudder, often from contaminated or wrong-spec fluid, as the first cause to rule out. If a fluid change to Mobil 1 Synthetic LV ATF HP doesn't fix it, worn valve body bores are the next suspect.
Shift shudder around 25-80 mph, harsh or flared 1-2 and 2-3 shifts, torque converter clutch slip or surge, and stored pressure or shift-solenoid codes all point to the valve body rather than a one-off electrical fault.
Mobil 1 Synthetic LV ATF HP, licensed by GM under the DEXRON HP specification. Use it for both the initial fill after this valve body install and for any future service fluid change.
Yes. Run the TCM adaptive relearn procedure after the install. Shifts will feel firmer than normal for the first several miles while the computer resets its learned pressure values to the new hardware.
You can, but if they're original with real mileage they're often close to the same wear state as the valve body you're replacing. Pairing the install with a solenoid kit addresses shudder and pressure complaints at the root instead of reinstalling tired parts.
