Is Your 2006 Envoy XL Shifting Erratically?
If you’re dealing with the frustration of a transmission that won’t shift correctly, warning lights on the dash, or your 2006 GMC Envoy XL being stuck in limp mode, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). In my 20+ years as a diagnostician, I’ve seen hundreds of these T42 modules cause headaches for GM owners. The symptoms often appear suddenly, turning a reliable SUV into an unpredictable machine. A bad TCM can mimic a major mechanical failure, but often, the fix is much simpler and less expensive than a full transmission rebuild.
Expert Pro Tip: Check Before You Replace
Before you order, take 5 minutes to inspect the main harness connector going into your old TCM. Over the years, I’ve found that moisture and road grime can cause corrosion on the pins, leading to poor communication and symptoms identical to a failed module. Unplug it, check for any green or white crust, and clean it with electrical contact cleaner. If the pins look clean and the problem persists, you can be confident the module itself is the issue.
The Direct-Fit Solution: A VIN-Programmed T42 TCM
This is the definitive solution for your vehicle’s transmission woes. We provide a high-quality T42 Transmission Control Module, part number 24235340, that arrives at your door pre-programmed to your Envoy XL’s specific Vehicle Identification Number (VIN). This critical step ensures the module communicates flawlessly with your vehicle’s engine computer and other systems right out of the box. You get to skip the expensive and time-consuming trip to the dealership for programming.
Common Symptoms of a Failing 2006 Envoy XL Transmission Module
A faulty TCM can manifest in numerous ways. From my experience in the shop, these are the most common signs that your module needs replacement:
- โ Harsh, slamming shifts or delayed gear engagement.
- โ The vehicle is stuck in a single gear (often 2nd or 3rd) and will not upshift or downshift.
- โ Check Engine Light or Transmission Warning Light is illuminated with codes like P0700, P0750, or other solenoid-related faults.
- โ A noticeable drop in fuel economy as the transmission operates inefficiently.
- โ Complete loss of communication with the scan tool, or intermittent electrical problems.
Plug-and-Play Installation: No Dealer Visit Required
Installing your new TCM is a straightforward job that most DIY mechanics can complete in under 30 minutes with basic hand tools. On the 2006 Envoy XL, it’s typically found in a very accessible location.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s adaptive memory.
- Locate the Module: On your Envoy XL, the TCM is located in the engine compartment on the driver’s side (LH).
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed module into place. Securely plug in the electrical connectors until they click.
- 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.
Guaranteed Compatibility and Reliability
This module is not just a replacement; it’s a restoration of your vehicle’s performance. It’s built to meet or exceed original equipment standards and is backed by our one-year warranty. It is a direct interchange for a wide range of GM part numbers, ensuring a perfect match for your repair needs.
Interchange Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24235753, 24240449, YNXS