Restore Smooth, Reliable Shifting to Your GMC Envoy XL
If you’re dealing with the frustration of a transmission that won’t shift correctly, bangs into gear, or has left you stranded in limp mode, you’re not alone. The Transmission Control Module (TCM) is the brain of your automatic transmission, and when it fails, it can cause a host of serious drivability problems. This OEM-quality T42 TCM, part number YNXS, is the definitive solution for your 2006 Envoy XL Transmission Control Module needs. It arrives expertly programmed to your vehicle’s specific VIN, ensuring a true plug-and-play repair that gets you back on the road without a costly trip to the dealership for programming.
Case Study: A Tricky Diagnosis
I once had a 2006 GMC Envoy XL with the 5.3L V8 come into my shop with a complaint of intermittent, bone-jarring shifts from 1st to 2nd gear, but only after it had been driven for over 20 minutes. The check engine light wasn’t always on, but when it was, it threw a generic P0700 code. The owner had already replaced a shift solenoid with no change. After monitoring live data, we saw the command signals from the TCM were dropping out as the engine bay heated up. Heat soak is a classic killer of these modules. We installed one of our VIN-programmed TCMs, and the problem was solved instantly. The customer saved hundreds by avoiding a dealership diagnosis and programming fee.
Is Your Envoy XL Showing These Telltale Signs?
- âś” Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- âś” The vehicle is stuck in a single gear (often called “limp mode”) and won’t upshift or downshift.
- âś” Check Engine Light or Transmission Warning Light is illuminated on the dash.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (e.g., P0750, P0753, P0758).
- âś” A noticeable drop in fuel economy or signs of the transmission overheating.
- âś” Complete loss of communication with the transmission module, leading to a no-start or no-shift condition.
Your Straightforward 30-Minute Installation Guide
Replacing your 2006 Envoy XL Transmission Control Module is a job most DIYers can handle with basic tools. The key is our VIN programming, which eliminates the most complex step. Just follow this simple process:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s electronic systems.
- Locate the Module: On the 2006 GMC Envoy XL with the 8-cylinder engine, the TCM is conveniently located in the left-hand (driver’s side) of the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old TCM. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and securely plug in the electrical connectors. You’ll hear a click when they are fully seated.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a few minutes. While the module is plug-and-play, it’s always a good practice to use a basic OBD2 scan tool to clear any stored historical codes to ensure a clean slate.
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct-fit replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page is focused on the 2006 Envoy XL Transmission Control Module, this part is also compatible with many other trucks, SUVs, and cars. Please see the comprehensive list below to confirm fitment for your specific model and year. This module interchanges with numerous part numbers, including 24242391, 24234503, 24252114, and YNXS.
What does VIN programming mean for me?
What does VIN programming mean for me?
It means this module is a true plug-and-play solution. We flash it with your vehicle’s specific VIN and the latest GM software before shipping. This ensures it communicates perfectly with your vehicle’s other computers right out of the box, saving you from a mandatory and expensive programming session at a dealership.
Do I need to send my old TCM back?
No. We do not require a core return. You can keep your old part, which saves you the time, cost, and hassle of shipping it back to us.
Will this fix a P0700 diagnostic code?
Yes, in most cases. A P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the failure (which is very common), replacing it with this programmed unit will resolve the P0700 code and any related specific codes.
Where is the TCM located on my 2006 Envoy XL?
For the 2006 GMC Envoy XL with an 8-cylinder engine, the Transmission Control Module is located in the engine compartment on the driver’s side (LH side).
Is this part difficult to install for a DIYer?
Not at all. Thanks to the pre-programming, the installation is a simple mechanical swap. If you can disconnect a battery and use a wrench to remove a few bolts, you can do this job in your driveway in under 30 minutes.