Restore Your Envoy’s Shifting Performance
If you’re dealing with the frustration of a transmission that won’t shift correctly, slams 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 vehicles, including the 2006 GMC Envoy XL, suffer from these exact issues. The culprit is often a failed Transmission Control Module (TCM). This isn’t just an inconvenience; it’s a safety concern that affects drivability and fuel economy. This OEM-quality T42 TCM, part number 24230461, is the definitive solution, engineered to restore the crisp, predictable shifting your vehicle had when it was new.
A Technician’s Notebook
I remember a 2006 Envoy XL that came into the shop stuck in 3rd gear. The owner was quoted a massive bill for a full transmission rebuild at another shop. After a quick scan, I saw a handful of solenoid circuit codes and the infamous P0700 (Transmission Control System Malfunction). Instead of a costly rebuild, we started with the brain—the TCM. These T42 modules are notorious for internal solder joint failures from years of heat cycles. We installed one of our VIN-programmed modules, cleared the codes, and the Envoy was shifting perfectly within the hour. The customer saved thousands and drove away with a reliable vehicle. This is why diagnosing the electronics first is critical.
Is Your Envoy XL Showing These Telltale Signs?
A failing TCM will give you clear warnings. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Ignoring these symptoms can lead to more severe transmission damage.
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle is stuck in “limp mode,” often only allowing access to 2nd or 3rd gear.
- ✔ Your Check Engine Light or a dedicated transmission warning light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758 (Shift Solenoid), or other communication errors.
- ✔ A sudden drop in fuel efficiency or signs of the transmission overheating.
- ✔ The transmission fails to upshift or downshift, feeling like it’s slipping between gears.
The Plug-and-Play Advantage of Our 2006 Envoy XL TCM
The biggest hurdle in replacing a modern electronic module is programming. Dealerships charge hundreds for this service alone. We eliminate that step entirely. By providing your vehicle’s VIN at checkout, we program the module with the latest GM software specifically for your 2006 Envoy XL. It arrives at your door ready for immediate installation, making this a simple, cost-effective repair for both seasoned mechanics and DIY enthusiasts. This isn’t just a replacement part; it’s a complete solution that ensures perfect communication between your engine and transmission for optimal performance and longevity.
A Straightforward Guide to Installation
You don’t need a professional lift or complex tools to get this job done. With basic hand tools, you can have your Envoy back on the road in under 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the 2006 GMC Envoy XL, the TCM is typically found in the engine compartment on the left-hand (driver’s) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. Start the vehicle and use a basic OBD2 scan tool to clear any stored fault codes from the previous failure. Your installation is complete.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles. While this page focuses on the 2006 Envoy XL TCM, please confirm your specific model in the list below. This module is interchangeable with part numbers including 24252114, 24234503, 24235732, and others.
- ENVOY XL (2006): 8 cylinder, located in the LH engine compartment.
- Chevrolet Silverado, Tahoe, Suburban (2007-2013): Typically located next to the battery.
- GMC Sierra, Yukon (2007-2013): Typically located next to the battery.
- Chevrolet Express & GMC Savana Vans (2006-2014): Located in the RH engine compartment.
- Cadillac DTS (2006-2011): Located in the RH front engine compartment.
- Chevrolet Impala & Monte Carlo (2006-2011): Found under the lower air cleaner housing.
- Pontiac G6 & Grand Prix (2006-2010): Located on the LH strut tower.
- Hummer H3 (2008-2010): Found in the RH rear engine compartment.
- …and many other GM models from 2006-2014. Please refer to the full fitment list for confirmation.
Frequently Asked Questions
What is VIN programming and why does it matter?
VIN programming loads your vehicle’s specific software and calibration files onto the module. This ensures it communicates perfectly with your engine and other systems, just like the original part. Without it, the vehicle may not start or shift correctly. Our pre-programming saves you a trip to the dealer.
Do I need any special tools for installation?
No. Basic hand tools like a socket set are all that’s required for the physical installation. We do recommend having a simple OBD2 scanner to clear any old fault codes after the new module is installed, but the vehicle will run without this step.
Is there a core charge for my old part?
No, we do not require you to send back your old module. There is no core charge, which simplifies the process and saves you money on return shipping.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty. We stand by the quality and reliability of our programmed electronics, giving you peace of mind with your purchase.
Will this fix a P0700 trouble code?
Yes, in many cases. A P0700 code is a general fault request from the TCM to the main computer. If the TCM itself is the source of the electrical fault (which is very common), replacing it with this programmed unit will resolve the P0700 and any related solenoid codes.