Restore Your Envoy’s Shifting Performance
If your 2006-2009 GMC Envoy is suffering from erratic shifting, getting stuck in gear, or has the check engine light on with transmission codes, you’re not just dealing with an annoyance—you’re facing a critical component failure. The Transmission Control Module (TCM) is the brain of your automatic transmission, and when it fails, it can make your reliable SUV feel unpredictable and unsafe. This replacement T42 TCM, part number 24235753, is the definitive solution, arriving expertly programmed to your vehicle’s VIN for a true plug-and-play repair.
A Technician’s Notebook
I remember a 2008 Envoy that came into my shop. The owner had already replaced two shift solenoids based on a generic code reader, but the harsh 1-2 shift and intermittent ‘limp mode’ persisted. A quick look with a professional scan tool showed communication errors with the TCM. The internal logic board was failing, a common issue from years of heat cycles in the engine bay. We installed one of these pre-programmed T42 modules. In less than 30 minutes, without any expensive dealer tools, the Envoy was shifting like it just rolled off the factory floor. It’s a classic case where chasing individual codes costs more than fixing the root cause: the TCM itself.
Is Your Envoy Exhibiting These Telltale Signs?
A failing TCM doesn’t heal itself; it only gets worse. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Addressing it now with a quality 2006-2009 Envoy TCM can prevent further damage to your transmission’s mechanical parts.
- ✔ Harsh, slamming, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light is on with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, or other solenoid-related faults.
- ✔ Failure to upshift or downshift, leading to poor acceleration and high RPMs.
- ✔ A noticeable drop in fuel economy.
- ✔ The transmission seems to slip out of gear.
- ✔ Complete loss of communication with the module, preventing diagnostics.
Plug-and-Play Installation: Get Back on the Road Fast
One of the biggest advantages of this module is that it eliminates the need for a trip to the dealership. We handle the programming for you. The physical installation is straightforward for any DIY enthusiast or professional mechanic.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On most 2006-2009 GMC Envoy models, the TCM is located in the engine compartment on the driver’s side (LH side).
- Remove the Old Module: Carefully unplug the electrical connectors. Use a small screwdriver to gently release the locking tabs if necessary. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always a good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU. Start the vehicle and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility List
This T42 Transmission Control Module is a direct replacement for part number 24235753 and is interchangeable with numerous other GM service numbers. While this page focuses on the 2006-2009 Envoy TCM, it also fits a wide range of other GM vehicles. Please verify your model and options below.
- GMC Envoy / Envoy XL / Trailblazer / Trailblazer EXT (2006-2009): (LH engine compartment)
- Chevrolet Silverado / GMC Sierra 1500, 2500 (2007-2013): (Typically next to the battery)
- Chevrolet Tahoe / Suburban / GMC Yukon (2007-2009): (Typically next to the battery)
- Chevrolet Express / GMC Savana Vans (2006-2014): (RH engine compartment)
- Cadillac DTS (2006-2011): (RH front engine compartment)
- Buick LaCrosse / Allure / Lucerne (2006-2011): (Lower air cleaner housing or LH engine compartment)
- Pontiac G6 / Grand Prix (2006-2010): (LH strut tower or lower air cleaner housing)
- Chevrolet Impala / Monte Carlo (2006-2011): (Lower air cleaner housing)
- Saturn Vue / Aura (2007-2010): (LH frame rail or front engine compartment)
- …and many other GM models. Please check the full fitment list or contact us with your VIN.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures the TCM works perfectly with your Envoy’s engine, transmission, and other systems right out of the box, eliminating the need for expensive dealership programming.
Do I need any special tools to install this 2006-2009 Envoy TCM?
No special tools are required. Basic hand tools like a socket set and a screwdriver are all you need for the physical installation. We do recommend having a simple OBD2 scan tool to clear any old codes after the installation is complete.
Is this a new or used part?
This is an OEM-quality replacement part, built to meet or exceed original factory specifications for performance and reliability. It comes with a one-year warranty for your peace of mind.
Will this fix a P0700 trouble code?
A P0700 code is a generic fault request from the TCM to the main engine computer (ECU) to turn on the check engine light. In many cases, a faulty TCM is the root cause of the P0700 and other related transmission codes. Replacing the module often resolves these issues, but proper diagnosis is always recommended.
Do I have to send my old part back?
No, there is no core charge for this part. You can keep or dispose of your old module, making the process faster and more convenient for you.