Restore Flawless Shifting to Your GMC Truck
If you’re dealing with the frustration of a transmission that won’t shift correctly, bangs into gear, or has left you stranded in limp mode, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM trucks, like the 2007 Sierra 2500, suffer from these exact issues. The cause is often a failed Transmission Control Module (TCM). This T42 TCM, part number 24243901, is the definitive, hassle-free solution. It arrives at your door pre-programmed to your truck’s specific VIN, eliminating the need for an expensive trip to the dealership for programming. It’s designed to directly manage your transmission’s shift points, torque converter clutch, and line pressure, restoring the smooth, reliable performance you depend on.
From the Service Bay: A Sierra’s Shifting Nightmare
From the Service Bay: A Sierra’s Shifting Nightmare
A customer brought in his ’07 Sierra 2500 with a 6.0L, complaining of intermittent but violent 1-2 shifts and occasionally getting stuck in 3rd gear. His scanner showed a generic P0700 code, but no specific solenoid faults. He’d already replaced the fluid and filter with no improvement. We suspected the TCM, as heat cycles and vibrations in the engine bay often cause internal solder joints to fail over time. Instead of a costly dealer part and programming fee, we installed one of our VIN-programmed T42 modules. The installation took less than 20 minutes. After a quick battery disconnect to clear adaptive memory, the truck shifted perfectly—no more harsh engagement or limp mode. It’s a common story, and this part is the reliable fix.
Is Your Truck Showing These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Addressing it now can prevent further damage to your transmission.
- âś” Harsh, erratic, or delayed gear shifts.
- âś” The vehicle is stuck in a single gear (often called “limp mode”).
- âś” Check Engine Light or Transmission Warning Light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- âś” Complete failure to upshift or downshift.
- âś” A noticeable decrease in fuel economy.
- âś” The transmission feels like it’s slipping between gears.
A Straightforward Guide to Installation
One of the best features of this part is its simple, plug-and-play installation. You don’t need to be a master mechanic to get your truck back in top shape. For the 2007 Sierra 2500 TCM, the module is typically located right next to the battery in the engine compartment.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the system’s adaptive learning.
- Locate the Old TCM: Find the module next to the battery. It will have several large electrical connectors attached to it.
- Disconnect and Remove: Carefully unplug the wiring harnesses. They have locking tabs that need to be released. Once unplugged, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely plug in the wiring harnesses, ensuring they click and lock into position.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic scan tool, it’s a good practice to clear any lingering fault codes from the system.
- Test Drive: Take your truck for a drive to confirm that shifting has returned to normal. The transmission will re-learn shift adapts over the next few drive cycles.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. It is interchangeable with part numbers 24252114, 24234503, 24230461, and others. Please verify your model and options below.
This part will fit these makes and models with these options
ENVOY 08-09 Transmission; (LH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
VUE 07-08 Transmission; 2.4L, (LH front engine compartment)
G5 07-10 Transmission; (LH strut tower)
SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
VUE 09 Transmission; 2.4L, w/hybrid, LH side front engine compartment, (shift control)
VUE 10 Transmission
TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
YUKON XL 1500 07-08 Transmission; (next to battery)
AURA 07-09 Transmission; (LH frame rail front)
RENDEZVOUS 06-07 Transmission; (air cleaner box)
SAAB 9-7X 06-09 Transmission; (LH engine compartment)
SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
ALLURE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 08-11 Transmission; (LH engine compartment)
RAINIER 06-07 Transmission
SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SILVERADO 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
YUKON 09 Transmission; (next to battery), w/o auxiliary oil cooler pump
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
YUKON 08 Transmission; (next to battery), w/o auxiliary oil cooler control
EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
SSR 05-06 Transmission; (front LH frame)
SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
SIERRA 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
ION 06-07 Transmission; (behind LH strut tower)
PURSUIT 06 Transmission; (LH strut tower)
TAHOE 07 Transmission; (next to battery)
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
MONTANA 06-09 Transmission; (LH strut tower)
TRAILBLAZER 08-09 Transmission; (LH engine compartment)
YUKON 07 Transmission; (next to battery)
G6 06-10 Transmission; (LH strut tower)
HHR 06-11 Transmission; (LH engine compartment)
TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
AVALANCHE 1500 07-08 Transmission; (next to battery)
COBALT 06-10 Transmission; (LH strut tower)
SIERRA 1500 PICKUP 08 Transmission; (next to battery)
SILVERADO 1500 PICKUP 08 Transmission; (next to battery)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
COLORADO 08-12 Transmission; (RH rear engine compartment)
SUBURBAN 1500 07-08 Transmission; (next to battery)
VUE 09 Transmission; 2.4L, w/o hybrid; (LH front engine compartment)
CANYON 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
TERRAZA 06-07 Transmission; (LH strut tower)
TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
UPLANDER 06-09 Transmission; (LH strut tower)
Frequently Asked Questions
- Do I need to take this part to a dealer for programming?
- No. This module comes fully pre-programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you time and money.
- Is there a core charge for my old part?
- There is no core charge. You can keep your old module or dispose of it without the hassle of sending it back.
- What tools are required for installation?
- Installation typically only requires basic hand tools, such as a socket set or wrench to unbolt the module and disconnect the battery. No special diagnostic equipment is needed.
- Will this fix my P0700 check engine light code?
- A P0700 is a generic code indicating a fault has been detected within the transmission control system. A faulty TCM is a very common cause for this code. Replacing the module will often resolve the P0700 and any related specific codes.
- What is the warranty on this TCM?
- This part is backed by our one-year warranty, giving you confidence in the quality and durability of your repair.