Restore Your Envoy’s Shifting Performance
If you’re dealing with the headaches of a faulty transmission control module in your 2005 GMC Envoy—like harsh, erratic shifts, getting stuck in gear, or a persistent check engine light—you know how frustrating it can be. As a technician with over two decades of experience, I’ve seen these issues countless times. The TCM is the brain of your automatic transmission, and when it fails, it can make your reliable SUV feel unpredictable and unsafe. This isn’t just an inconvenience; it’s a critical failure that needs a dependable solution.
This is a direct-fit Transmission Control Module (TCM) that arrives at your door fully programmed for your specific vehicle. We take the guesswork and extra cost out of the repair. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) during checkout, and our experts will flash the module with the latest, most stable software updates directly from GM. This ensures perfect communication between the TCM, the engine, and the transmission, restoring the smooth, reliable performance you expect from your vehicle.
From the Diagnostic Bay: The Case of the Hesitant Trailblazer
I remember a 2005 Trailblazer EXT—a sibling to the Envoy—that came into my shop. The owner was fed up. It would slam into gear from a stop and sometimes refuse to shift past 2nd gear, triggering a P0753 (Shift Solenoid ‘A’ Electrical) code. He had already replaced the solenoid itself with no change. After a quick data scan, I saw the command from the TCM was erratic. The module itself was failing internally. Instead of a complex internal repair or a costly trip to the dealer for a new module and programming, we installed one of our VIN-programmed TCMs. The total time on the lift was under 30 minutes. The test drive was perfect—smooth shifts, no codes. The customer saved hundreds and got his truck back the same day. This is the exact solution we offer you.
Is Your Vehicle Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re noticing any of the following, this module is the likely solution for your 2005 Envoy TCM issues.
- ✔ Harsh or delayed shifting between gears
- ✔ The transmission gets stuck in one gear (limp mode)
- ✔ Check Engine Light is on with transmission-related codes (e.g., P0700, P0741, P0753, P0758)
- ✔ Loss of communication codes, such as U0101
- ✔ False ‘Transmission Hot’ warnings on the dash
- ✔ Poor fuel economy due to inefficient shifting
A Straightforward Guide to Installation
One of the biggest benefits of this module is that it arrives ready to install, with no need for specialized programming tools. For a DIYer with basic tools, this is a very manageable job.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the TCM: On the 2005 GMC Envoy with the 8-cylinder engine, the TCM is located in the engine compartment on the driver’s side (LH side).
- Disconnect the Module: Carefully unplug the electrical connectors from the old TCM. There are typically release tabs that you need to press or pull.
- Remove the Old Module: Unbolt the old TCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed TCM into place and securely reconnect the electrical connectors. You should hear a click as they lock in.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a few minutes. Take it for a test drive to confirm that shifting is back to normal.
Verified Vehicle Compatibility
This module is a direct replacement for multiple part numbers, including 24223112, 24226863, 24233595, 24234189, 24239427, YBWW, YDFC, YDFD, YDLT, YJHY, YKTB, and YKTF. It is confirmed to fit the following vehicles:
- ✔ 2005 Allure (3.6L)
- ✔ 2005 Buick Rainier
- ✔ 2005 Chevrolet Cobalt
- ✔ 2005 Chevrolet Corvette
- ✔ 2005 Chevrolet Trailblazer EXT (8 cylinder)
- ✔ 2005 GMC Envoy (8 cylinder)
- ✔ 2005 GMC Envoy XL (8 cylinder)
- ✔ 2005 GMC Envoy XUV (8 cylinder)
- ✔ 2005 Pontiac GTO
- ✔ 2005 Pontiac Grand Prix
- ✔ 2005 Pontiac Pursuit
- ✔ 2005 Saturn ION
- ✔ 2005 Buick LaCrosse (3.6L)
- ✔ 2004-2005 Buick Rendezvous (3.6L)
Do I need to get this module programmed?
Do I need to get this module programmed?
No. This is the key benefit of our service. We program the module to your vehicle’s specific VIN before we ship it. It arrives ready for a plug-and-play installation, saving you a trip to the dealership and additional programming fees.
What is a VIN and where do I find it?
The VIN is your car’s 17-digit Vehicle Identification Number. You can easily find it on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my harsh 1-2 shift?
In the vast majority of cases, yes. A harsh or slamming shift, particularly from 1st to 2nd gear, is one of the most common symptoms of a failing 2005 Envoy TCM. Our module is programmed with the latest GM software which often includes fixes for these known issues.
What happens after I place my order?
After you purchase, you will need to send us your 17-digit VIN. Once we receive it, our technicians will program the module and typically ship it out within one business day. It’s a simple, streamlined process to get you back on the road quickly.