Remanufactured transmission control module for GM 6L80 and 6L90 six-speeds, cross-references OE 24275873 and 24275874 on 2010-up trucks.
A 6L80 that suddenly loses communication with the transmission computer, drops into a single limp gear, or sets solenoid circuit codes on several solenoids at once usually has a failed control module, not a mechanical problem. This is a remanufactured TEHCM for the GM 6L80 and 6L90, cross-referenced to OE numbers 24275873 and 24275874, for 2010-up Chevrolet Silverado, Tahoe and Suburban, GMC Sierra and Yukon, Cadillac Escalade and other GM and Isuzu applications built with those units. As our photo shows, it is the complete module: computer, solenoid body and lead frame in one assembly.
GM did not give the 6L80 a computer under the hood. The transmission control module lives inside the transmission, bolted to the valve body under the pan, and GM calls the whole assembly the TEHCM (transmission electro-hydraulic control module). Sonnax explains that the eight solenoids connect to the TCM through a lead frame, and all of it is over-molded in one plastic housing. That means nothing inside is serviceable on its own: a failed circuit, a cracked solder joint or a dead solenoid means replacing the module. The TEHCM reads input and output speed, fluid temperature and pressure switches, then drives the solenoids that apply each clutch and the converter clutch.
Rule out the cheap causes first. Check battery voltage and grounds, then inspect the transmission connector and harness for oil intrusion, green corrosion or a chafed wire. Confirm fluid level with the correct hot check procedure. If line pressure follows the command on a gauge and the hydraulics check out, but the module still throws multiple circuit codes or will not talk, the TEHCM is the failed part. Our 6L80 common problems guide covers how module faults differ from valve body wear, and the 6L80 Escalade shift problems guide walks through the adapt reset GM recommends before replacing parts.
This listing covers 6L80 and 6L90 units with OE TEHCM number 24275873 or 24275874, 2010 and up. Those two numbers are not always interchangeable: Sonnax groups 24275874 with its earlier 2010-2013 era module and 24275873 with the later 2011-2020 module. Read the number off the label on your old TEHCM and order only if it matches, or send us your year and VIN and we will check it. Earlier 2006-2009 units used different module numbers. For everything else that fits, see our 6L80 parts collection.
If the old module failed after years of worn hydraulics, the valve body may need attention too. A Superior 6L80E/6L90E valve body upgrade kit corrects common pressure complaints, or replace the casting outright with the 6L80 control valve body.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Inside the transmission. On the 6L80 and 6L90 the TCM is part of the TEHCM, which bolts to the valve body under the transmission pan. This listing is that internal module with its solenoids.
Yes. A replacement TEHCM must be programmed to your vehicle with a J2534 device or a scan tool that supports GM SPS programming. Plan for that before you install it, or line up a shop that can do it.
The listing cross-references both numbers, but Sonnax places them in different module groups (24275874 earlier, 24275873 later). Match the number on your old unit and send us your year and VIN if they differ.
No. The eight solenoids, lead frame and TCM are over-molded into one housing, so the whole TEHCM is replaced as a unit.
A new filter and pan seal, and Dexron VI fluid. If the old module failed with high mileage and pressure complaints, consider valve body work at the same time.
Program the module, clear codes, reset transmission adapts and complete a relearn drive so the module learns clutch fill times.
