Restore Smooth Shifting to Your GMC Envoy
If your 2006-2009 GMC Envoy is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, a failing Transmission Control Module (TCM) is the most likely culprit. As a technician with over 20 years of experience, I’ve seen these symptoms countless times. The TCM is the electronic brain of your automatic transmission, and when it fails, it can cause a cascade of frustrating and potentially damaging issues. This replacement T42 TCM, part number 24230461, is the definitive solution to get your SUV driving like new again.
We take the guesswork and high cost out of the repair by pre-programming this module to your vehicle’s specific VIN. This means it arrives at your door ready for a true plug-and-play installation, eliminating the need for an expensive trip to the dealership for programming. This is the same process we use in our shop to guarantee a fast and reliable fix for our customers.
Is Your Envoy Exhibiting These Transmission Problems?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ The Check Engine Light is on with diagnostic trouble codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- ✔ Failure to upshift or downshift properly, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
- ✔ Complete loss of communication with the transmission.
A Technician’s Notebook
I recently had a 2008 GMC Envoy in the bay with a classic case of intermittent TCM failure. The customer complained that some days it drove perfectly, but on others, it would slam into gear and get stuck in 3rd. There were no hard codes stored, just a history code for P0700 (Transmission Control System Malfunction). After checking the wiring and fluid, everything seemed fine. The intermittent nature pointed directly to the electronics inside the TCM breaking down under heat. We installed one of our VIN-programmed modules, and the problem was solved instantly. This is a common failure point on these vehicles, and this part provides a permanent fix.
The Smart Solution: A Pre-Programmed 2006-2009 Envoy TCM
Replacing your failing module with our VIN-programmed unit is the most efficient way to solve your transmission problems. By programming it with the latest GM software updates tied to your vehicle, we ensure optimal shift strategy, torque converter lockup, and fuel efficiency. You’re not just getting a replacement part; you’re getting a component that’s specifically calibrated for your exact vehicle configuration.
A Straightforward Guide to Installation
For the GMC Envoy and its platform mates (like the Trailblazer and Saab 9-7X), this is a job most DIY enthusiasts can handle in their driveway in under 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the TCM: On your 2006-2009 Envoy, the TCM is located in the engine compartment on the driver’s side (LH side).
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. 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. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any lingering fault codes from the computer’s memory.
Verified Vehicle Compatibility
This module is a direct replacement for part number 24230461 and other interchangeable numbers. While this page is focused on the Envoy, it also fits a wide range of GM vehicles. Please verify your part number or contact us with your VIN to ensure perfect fitment.
- ✔ GMC Envoy / Envoy XL / Trailblazer / Trailblazer EXT: 2006-2009 (8-cylinder models)
- ✔ Chevrolet Silverado & GMC Sierra 1500/2500: 2007-2013 (See fitment list for specifics)
- ✔ Chevrolet Tahoe/Suburban & GMC Yukon/Yukon XL: 2007-2009
- ✔ Chevrolet Impala / Monte Carlo: 2006-2011
- ✔ Buick LaCrosse / Lucerne: 2006-2011
- ✔ Cadillac DTS: 2006-2011
- ✔ Pontiac G6 / Grand Prix: 2006-2010
- ✔ Saturn Aura / Vue / Ion: 2006-2010
- ✔ And many more GM models from 2006-2014.
Frequently Asked Questions
What exactly is VIN programming?
VIN programming is the process of loading your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and its corresponding factory software onto the module. This ensures the TCM communicates perfectly with your vehicle’s engine computer and other systems for correct shifting and performance, just like the original part from the factory.
Do I need to send my old TCM back (core charge)?
No, there is no core charge for this part. You can keep your old module or dispose of it, making the process hassle-free.
Will this fix my transmission codes like P0700 or P0750?
Yes. If the codes are being caused by a faulty module, this replacement part is designed to resolve those issues. P0700 is a general fault request from the TCM, and solenoid codes like P0750 are often triggered by a failing driver circuit inside the module itself.
Is this a difficult part to install myself?
For most individuals with basic hand tools, this is a very straightforward repair. The module is typically easy to access in the engine bay, and since it’s pre-programmed, no special computer tools are needed for the installation itself.
Is this a new or used part?
This is a high-quality, OEM-standard replacement part, inspected and programmed to ensure it meets or exceeds factory specifications for performance and reliability. It comes with a one-year warranty.