Restore Your GM’s Shifting Performance and Reliability
If you’re dealing with erratic shifting, a transmission stuck in gear, or a persistent Check Engine light on your 2005 GMC Envoy, a failing Transmission Control Module (TCM) is often the culprit. As a mechanic with over two decades of experience, I’ve seen countless drivers frustrated by these exact issues. A faulty TCM can make your vehicle feel unpredictable and unsafe. This isn’t just an inconvenience; it’s a core performance problem that needs a reliable solution.
This is a direct-fit replacement TCM, part number 24223112, that arrives at your door fully programmed to your vehicle’s specific VIN. We handle the complex part for you—flashing the module with the latest, most stable software updates from GM. This means you can bypass the expensive trip to the dealership for programming. You get a component that is ready for installation right out of the box, designed to restore the crisp, smooth shifting you expect from your vehicle. Getting your truck or car back to factory-spec operation is our top priority.
Common Signs of a Failing TCM
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ Transmission getting stuck in one gear (limp mode).
- ✔ Inability to shift into or out of a specific gear.
- ✔ Unexplained Check Engine Light or transmission warning indicators.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, U0101, or other transmission-related faults.
- ✔ Poor fuel economy due to inefficient shifting patterns.
Case Study: A Tricky Diagnosis
I once had a 2005 Trailblazer with the 8-cylinder in my bay with classic bad TCM symptoms—harsh 1-2 shift and intermittent limp mode. The owner had already replaced two valve body solenoids with no luck. After connecting my scan tool, I saw no communication with the TCM (a U0101 code). Before condemning the module, I always check the power and ground circuits at the TCM connector. In this case, they were perfect. This confirmed the internal failure of the original 2005 Envoy TCM. We installed one of our pre-programmed modules, performed the quick relearn procedure, and the truck was shifting perfectly within the hour. It’s a reminder that while symptoms point to the TCM, a quick verification of power and ground can save you from misdiagnosing the issue.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the TCM: On the 2005 Envoy with an 8-cylinder engine, the TCM is typically found in the engine compartment on the driver’s side (LH). For other models, its location can vary (e.g., behind the LH strut tower or under the air cleaner housing). Refer to your service manual for the exact location.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- ✔ Install the New Module: Mount your new, pre-programmed TCM in the same location. Securely reconnect all electrical connectors, ensuring they click into place.
By choosing this pre-programmed 2005 Envoy TCM, you are not just buying a part; you are getting a complete, hassle-free solution. It’s the most efficient way for both professional technicians and DIY enthusiasts to solve complex transmission electronic issues and get vehicles back on the road with confidence.
Verified Vehicle Compatibility
This module is a direct replacement for part number 24223112 and is compatible with a wide range of 2004-2005 GM vehicles. Please verify your part number and model from the list below. After purchase, you must provide your VIN so we can ensure perfect programming for your specific vehicle.
Compatible Part & Service Numbers: 24223112, 24226863, 24233595, 24234189, 24239427, YBWW, YDFC, YDFD, YDLT, YJHY, YKTB, YKTF
- ✔ ALLURE 05: Transmission; (lower air cleaner housing)
- ✔ COBALT 05: Transmission; (LH strut tower)
- ✔ CORVETTE 05: Transmission; (LH frame rail)
- ✔ ENVOY 05: Transmission; (LH engine compartment), (8 cylinder)
- ✔ ENVOY XL 05: Transmission; (LH engine compartment), (8 cylinder)
- ✔ ENVOY XUV 05: Transmission; (LH engine compartment), (8 cylinder)
- ✔ GRAND PRIX 05: Transmission; (lower air cleaner housing)
- ✔ GTO 05: Transmission
- ✔ ION 05: Transmission; (behind LH strut tower)
- ✔ LACROSSE 05: Transmission; (3.6L), (lower air cleaner housing)
- ✔ PURSUIT 05: Transmission; (LH strut tower)
- ✔ RAINIER 05: Transmission
- ✔ RENDEZVOUS 04-05: Transmission; (3.6L), (air cleaner box)
- ✔ TRAILBLAZER EXT 05: Transmission; (LH engine compartment), (8 cylinder)
Frequently Asked Questions
How does the programming process work?
After you complete your purchase, you will need to send us your vehicle’s 17-digit VIN. We use this to load the latest GM-certified software for your specific vehicle onto the TCM before we ship it. This ensures it works correctly right out of the box.
Is this a plug-and-play part?
Yes, because we program it to your VIN, it is a plug-and-play solution. No additional programming or trips to the dealer are required for the module to function. Some vehicles may require a simple transmission relearn procedure for optimal shift quality.
Will this fix my harsh shifting problem?
If the harsh shifting is caused by a faulty TCM, then yes, this part is the correct solution. A failing TCM is one of the most common causes of erratic shifting, limp mode, and transmission-related error codes on these GM vehicles.
What if I install it and still have issues?
While this 2005 Envoy TCM resolves the vast majority of electronic transmission faults, issues can also stem from mechanical parts like solenoids, wiring, or the valve body. We recommend having a proper diagnosis performed if you are unsure of the cause.
Is this compatible with other part numbers?
Yes, this module is a direct replacement for several part numbers, including 24226863, 24233595, 24234189, and 24239427, among others listed above.