Restore Your Envoy’s Smooth Performance
If you’re dealing with the headaches of a failing transmission computer in your 2005 GMC Envoy, you know how frustrating it can be. Symptoms like jarring shifts, getting stuck in gear, or a persistent check engine light can make driving a chore and a worry. As a technician with over two decades of experience, I’ve seen firsthand how a faulty Transmission Control Module (TCM) can sideline an otherwise reliable vehicle. This isn’t just an inconvenience; it’s a critical component for your vehicle’s performance and safety.
This is your direct-fit, reliable solution. We are offering a replacement 2005 Envoy TCM that arrives at your door completely programmed to your vehicle’s specific VIN. We install the latest, most stable software updates from GM, ensuring that your transmission operates exactly as the manufacturer intended. This process eliminates the need for an expensive trip to the dealership for programming, saving you significant time and money. Simply provide your VIN after purchase, and we handle the rest, delivering a module that’s ready for installation right out of the box.
Case Study: The 2005 Trailblazer That Wouldn’t Shift
A customer brought in a 2005 Chevy Trailblazer EXT—a vehicle that shares its platform and electronics with the Envoy—with a classic complaint: the transmission was shifting hard from 1st to 2nd and sometimes felt like it was starting in the wrong gear. The check engine light was on, and a scan revealed code U0100 – Lost Communication with TCM. After verifying the wiring and power supply to the module were intact, it was clear the original TCM had failed internally. Instead of a costly dealer visit, we installed one of these VIN-programmed modules. The installation took less than 30 minutes, and on the first test drive, the transmission shifted perfectly. It’s a textbook example of how the right part, correctly programmed, provides a fast and effective fix.
Is Your Envoy Exhibiting These Transmission Woes?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs attention. I’ve diagnosed hundreds of these, and these are the most common signs:
- ✔ Abrupt, harsh, or delayed gear shifts.
- ✔ The transmission getting stuck in one gear (limp mode).
- ✔ A lit Check Engine Light, often with codes like P0700, P0753, or P0758.
- ✔ Loss of communication with the TCM, triggering a U0100 code.
- ✔ Inaccurate speedometer readings or other instrument cluster warnings.
- ✔ Reduced fuel economy due to inefficient shifting.
A Straightforward Guide to Installation
One of the key benefits of this module is its simple, plug-and-play installation. For a DIYer with basic tools, this is a very manageable job. Here’s a general guide for your 2005 Envoy TCM replacement:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the Module: On the 2005 GMC Envoy (and its siblings like the Trailblazer EXT), the TCM is typically found in the engine compartment on the driver’s side (LH side).
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Press the release tabs firmly to avoid damaging the clips. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your new, pre-programmed TCM onto the bracket and securely tighten the bolts. Reconnect the electrical harnesses, ensuring they click firmly into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a moment. It’s often a good idea to perform a short drive cycle, allowing the transmission to adapt to the new module through a few gentle upshifts and downshifts.
Verified Vehicle Compatibility
This module is a direct replacement for part number 24239427 and is also compatible with a wide range of alternate part numbers, including 24223112, 24226863, 24233595, 24234189, YBWW, YDFC, YDFD, YDLT, YJHY, YKTB, and YKTF. It is guaranteed to fit the following models:
- 2005 ALLURE: Transmission; (lower air cleaner housing)
- 2005 COBALT: Transmission; (LH strut tower)
- 2005 CORVETTE: Transmission; (LH frame rail)
- 2005 ENVOY: Transmission; (LH engine compartment), (8 cylinder)
- 2005 ENVOY XL: Transmission; (LH engine compartment), (8 cylinder)
- 2005 ENVOY XUV: Transmission; (LH engine compartment), (8 cylinder)
- 2005 GTO: Transmission
- 2005 GRAND PRIX: Transmission; (lower air cleaner housing)
- 2005 ION: Transmission; (behind LH strut tower)
- 2005 LACROSSE: Transmission; (3.6L), (lower air cleaner housing)
- 2005 PURSUIT: Transmission; (LH strut tower)
- 2005 RAINIER: Transmission
- 2004-2005 RENDEZVOUS: Transmission; (3.6L), (air cleaner box)
- 2005 TRAILBLAZER EXT: Transmission; (LH engine compartment), (8 cylinder)
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. We program the module to your vehicle’s VIN before we ship it. It arrives ready to install, saving you the time, cost, and hassle of a dealership visit.
What information do you need from me?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. You can find this on your dashboard (visible through the windshield) or on the driver’s side door jamb sticker.
Will this fix my transmission’s harsh shifting?
A faulty TCM is one of the most common causes of harsh shifting, delayed engagement, and other erratic transmission behaviors. While other mechanical issues can cause similar symptoms, replacing a failed TCM with this pre-programmed unit is a very effective solution for these electronic faults.
Where is the TCM located on my 2005 Envoy?
For the 2005 GMC Envoy with the 8-cylinder engine, the Transmission Control Module is located in the engine compartment on the driver’s side (LH).
My original part has a different number on it. Will this work?
Yes, this part is a direct replacement for several part numbers. Please check the list of compatible part numbers (e.g., 24223112, 24226863, etc.) in the description to confirm it matches your needs.
Is this a used part?
No, this is a quality replacement part that is loaded with new, updated software from GM to ensure optimal performance and longevity.