If your 2006 GMC Envoy XL is suffering from erratic shifting, getting stuck in gear, or has the check engine light on with transmission codes, you’re likely dealing with a failed Transmission Control Module (TCM). It’s a frustrating and common issue, but the fix is more straightforward than you might think. This OEM-quality T42 TCM, part number 24252114, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
A Technician’s Notebook
I remember a customer bringing in his 2006 Envoy XL, complaining it felt like it was “stuck in mud.” The SUV would barely accelerate and was locked in what we call ‘limp mode.’ A quick scan pulled a P0700 code, a general transmission fault. After checking the basics, experience pointed directly to the TCM. These T42 modules are notorious for internal electronic failure over time. Instead of a costly trip to the dealer for a new module and programming, we installed one of our pre-programmed units. In under 30 minutes, the Envoy was shifting like it just rolled off the factory floor. The customer saved hundreds and was back on the road the same day. This is the exact, reliable fix for that exact problem.
Is Your Envoy Exhibiting These Transmission Problems?
A failing TCM sends clear signals. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Ignoring these can lead to more significant transmission damage down the line.
- ✔️ Harsh, slamming shifts or delayed gear engagement.
- ✔️ Vehicle is stuck in one gear (limp mode), often 2nd or 3rd.
- ✔️ Check Engine Light or Transmission Warning Light is illuminated.
- ✔️ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔️ Inability to upshift or downshift properly, leading to poor acceleration.
- ✔️ A noticeable decrease in fuel economy.
The Core of the Solution: A Properly Programmed 2006 Envoy XL TCM
The transmission in your Envoy XL relies on this module for every decision it makes—from shift timing to torque converter lockup. When it fails, the entire system is compromised. Our process ensures this replacement works perfectly out of the box. We flash the module with the latest GM software calibrated specifically to your VIN. This eliminates the need for expensive scan tools or dealership visits, making it a perfect solution for both professional shops and DIY mechanics. It directly addresses the electronic faults that cause shifting issues and fault codes, restoring the precise, smooth operation your vehicle was designed for.
A Straightforward Guide to Your TCM Installation
You don’t need to be a master mechanic to replace this module. The process is simple and can be completed in your driveway with basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the TCM: On your 2006 Envoy XL with the 8-cylinder engine, the TCM is located in the left-hand (driver’s side) of the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket. Keep the hardware in a safe place.
- Install the New Module: Mount the new, pre-programmed TCM in the same location using the original hardware. Securely reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While the system may reset, it’s best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the vehicle and test drive to confirm smooth shifting.
Verified Vehicle Compatibility List
This T42 TCM is a direct replacement for a wide range of General Motors vehicles. Please verify your model and any specific options listed below for guaranteed fitment.
- ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
- ALLURE 06-09 Transmission; (lower air cleaner housing)
- AVALANCHE 1500 07-08 Transmission; (next to battery)
- CANYON 08-12 Transmission; (RH rear engine compartment)
- COBALT 06-10 Transmission; (LH strut tower)
- COLORADO 08-12 Transmission; (RH rear engine compartment)
- DTS 06-11 Transmission; (RH front engine compartment)
- ENVOY 06-09 Transmission; (LH engine compartment)
- EXPRESS 1500/2500/3500 VAN 06-14 Transmission; (RH engine compartment)
- G5 07-10 Transmission; (LH strut tower)
- G6 06-10 Transmission; (LH strut tower)
- GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
- HHR 06-11 Transmission; (LH engine compartment)
- HUMMER H3 08-10 Transmission; (RH rear engine compartment)
- IMPALA 06-11 Transmission; (lower air cleaner housing)
- ION 06-07 Transmission; (behind LH strut tower)
- LACROSSE 06-09 Transmission; (lower air cleaner housing)
- LUCERNE 06-11 Transmission; (LH engine compartment)
- MALIBU 06-10 Transmission; (LH frame rail)
- MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
- MONTANA 06-09 Transmission; (LH strut tower)
- PURSUIT 06 Transmission; (LH strut tower)
- RAINIER 06-07 Transmission
- RENDEZVOUS 06-07 Transmission; (air cleaner box)
- SAAB 9-7X 06-09 Transmission; (LH engine compartment)
- SIERRA 1500/2500 PICKUP 07-13 Transmission; (next to battery)
- SILVERADO 1500/2500 PICKUP 07-13 Transmission; (next to battery)
- SSR 05-06 Transmission; (front LH frame)
- SUBURBAN 1500 07-08 Transmission; (next to battery)
- TAHOE 07-09 Transmission; (next to battery)
- TERRAZA 06-07 Transmission; (LH strut tower)
- TRAILBLAZER & EXT 06-09 Transmission; (LH engine compartment)
- UPLANDER 06-09 Transmission; (LH strut tower)
- VUE 07-10 Transmission
- YUKON & YUKON XL 1500 07-09 Transmission; (next to battery)
What does ‘VIN programmed’ actually mean for me?
What does ‘VIN programmed’ actually mean for me?
It means you receive a module that is 100% ready to install without any additional steps. We load the correct software for your specific vehicle using your VIN before we ship it. This saves you a trip to the dealership and the high cost of their programming service, making the repair faster and more affordable.
Is this a difficult part to install myself?
Not at all. For most DIYers with basic tools, this is a very manageable job that typically takes less than 30 minutes. The module is easily accessible in the engine bay, and the process involves unplugging connectors and removing a few bolts.
Will this replacement TCM fix a P0700 trouble code?
In many cases, yes. A P0700 is a generic code indicating the TCM has detected a problem. If the TCM itself is the source of the electrical fault, replacing it with this pre-programmed unit is the direct and correct fix to clear the code and resolve the underlying issue.
Do I need to send my old TCM back?
No, there is no core charge or need to return your old part. You can keep it, recycle it, or dispose of it at your convenience, making the transaction simple and hassle-free.
How do I know this is the right part for my 2006 Envoy XL?
This module, part number 24252114, is the correct T42 module for the 2006 GMC Envoy XL with the 8-cylinder engine. By providing your VIN at checkout, we double-verify and program it to ensure perfect compatibility for your specific vehicle.