Is Your GMC Envoy Shifting Poorly or Stuck in Limp Mode?
Experiencing harsh, erratic shifting, a check engine light that won’t go away, or the dreaded “limp mode” can be incredibly frustrating. These are classic signs that the brain of your automatic transmission, the Transmission Control Module (TCM), has failed. When this component malfunctions, it disrupts communication between the engine and transmission, leading to poor performance, reduced fuel economy, and potential damage to other drivetrain components. Don’t let a faulty TCM sideline your reliable SUV. This pre-programmed T42 TCM is the definitive solution to get your Envoy running smoothly and dependably once again.
Common Symptoms of a Failing Envoy TCM & Your Solution
A failing TCM can manifest in various ways, often starting as an intermittent annoyance before becoming a constant problem. If you’re noticing any of the following issues, it’s highly likely that your module needs replacement. This unit is specifically designed to be the permanent fix for these exact problems.
- Harsh or delayed gear engagement
- Slipping between gears or failure to upshift/downshift
- Vehicle stuck in a single gear (limp mode)
- Active Check Engine Light or Transmission Warning Light
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes
- Poor fuel efficiency and potential transmission overheating
Installing this pre-programmed 2006-2009 GMC Envoy Transmission Control Module is the most effective way to resolve these issues and restore your vehicle’s factory performance without a costly trip to the dealership for programming.
Features & Benefits
- ✔ Plug & Play Installation: This module arrives pre-programmed to your vehicle’s specific VIN. This crucial step ensures it communicates perfectly with your Envoy’s powertrain right out of the box, eliminating the need for expensive scan tools or dealership programming.
- ✔ Restored Drivability: By precisely managing shift points, torque converter lockup, and line pressure, this TCM restores the smooth, predictable shifting you expect, enhancing both comfort and performance.
- ✔ OEM-Quality & Durability: Manufactured to meet or exceed original equipment standards, this module is built to withstand the demanding environment of the engine bay, ensuring long-term reliability for your daily driver or workhorse.
- ✔ Cost-Effective Solution: Avoid the high costs and wait times associated with dealership repairs. This direct-fit module provides a dependable fix at a fraction of the price.
- ✔ Warranty Protection: This unit is backed by our one-year replacement warranty.
From the Expert’s Bench: A common mistake we see is installing a used, non-programmed TCM. On these GM T42 systems, the module is not just a simple computer—it’s loaded with specific software and shift strategy files tailored to your Envoy’s engine, axle ratio, and tire size. Without the correct VIN programming, the transmission will never shift correctly, and you’ll be right back where you started. Our programming service uses the latest GM software updates, ensuring this 2006-2009 GMC Envoy Transmission Control Module performs flawlessly from the moment you install it.
Broad Compatibility & Installation
While this is the perfect fit for your Envoy, this versatile T42 module is also compatible with a wide range of GM vehicles, including the Chevrolet Silverado, Tahoe, Impala; GMC Sierra and Yukon; Buick LaCrosse; and many more models equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. The installation process for your 2006-2009 GMC Envoy Transmission Control Module is straightforward, typically located in the LH side of the engine compartment. Simply disconnect the battery, unbolt the old module, disconnect the electrical connectors, and install the new one. Once installed, reconnect the battery and clear any remaining codes with a basic scan tool to complete the job.
Frequently Asked Questions
What does “VIN Programmed” mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) into the module before shipping. This ensures the TCM has the exact software and calibration files from GM for your specific vehicle configuration, making it a true plug-and-play part.
Do I need to send my old part back?
No, there is no core charge for this transmission control module. You can keep or dispose of your old part at your convenience, saving you the time and hassle of a return shipment.
Is any special tool required for installation?
Basic hand tools are all that’s typically needed to physically replace the module. After installation, we recommend using a standard OBD-II scan tool to clear any stored diagnostic trouble codes from the vehicle’s memory.
How do I know if this is the right part for my vehicle?
This part is a direct replacement for service number 24243901 and many others listed in the description. The best way to confirm is to match the part number on your original module. If you are unsure, please contact us with your VIN, and our experts will verify the fitment for you.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault code, meaning the TCM has requested the check engine light be turned on. Often, a failing TCM is the root cause. While this module will fix the issue if the TCM itself is faulty, it’s always best to have the specific transmission codes (e.g., P07xx) read to confirm the diagnosis.