Restore Your Envoy’s Drivability and Performance
If your 2006-2009 GMC Envoy is suffering from harsh shifting, getting stuck in gear, or throwing transmission-related check engine lights, you’re not alone. The Transmission Control Module (TCM) is the electronic brain of your automatic transmission, and when it fails, it can cause a host of frustrating and potentially damaging issues. This replacement T42 TCM, part number 24235340, is the definitive solution to get your SUV running smoothly and reliably again. As a technician with over two decades of experience, I’ve seen how a failing TCM can mimic more serious mechanical problems, leading to costly misdiagnoses. This module is your direct path to a correct and lasting repair.
From the Diagnostic Bay: The Intermittent Shifting Mystery
I once had a 2008 Envoy roll into my shop with a problem that had stumped two other mechanics. The owner described random, violent downshifts on the highway and occasional failure to shift out of first gear from a stop. No codes were stored consistently. We checked fluid levels, solenoids, and wiring harnesses—all perfect. The issue was heat-related and intermittent. Based on experience with these 4L60E platforms, I knew the TCM was the likely culprit. After installing a VIN-programmed module just like this one, the problem vanished completely. It’s a reminder that with modern electronics, the simplest component swap can solve the most complex-seeming issues.
Is Your GMC Envoy Showing These Warning Signs?
- ✔ Unpredictable, harsh, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear, often called “limp mode.”
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as the general P0700 code or specific solenoid codes (e.g., P0751, P0756).
- ✔ A noticeable drop in fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the transmission module.
Your Straightforward 30-Minute Installation Guide
One of the best features of this module is its simple, DIY-friendly installation. Because we program it to your vehicle’s VIN before shipping, you won’t need a trip to the dealership for expensive programming. You can do this right in your driveway.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the 2006-2009 GMC Envoy, the TCM is typically found in the engine compartment on the driver’s side (LH). Check near the strut tower or main fuse box.
- Swap the Part: Carefully unplug the electrical connectors from the old TCM. Unbolt it from its mounting bracket. Install the new module in its place, secure the bolts, and firmly reconnect the electrical connectors.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a few minutes. If you have a basic OBD2 scan tool, it’s a good practice to clear any lingering fault codes from the computer’s memory.
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. It is a reliable solution for your 2006-2009 Envoy TCM and is also compatible with many other models. It directly interchanges with part numbers 24252114, 24234503, 24230461, 24234274, 24235754, and others, ensuring you get the right part for the job. Key compatible models include:
- GMC Envoy, Yukon, Sierra, Savana
- Chevrolet Trailblazer, Tahoe, Silverado, Impala, Cobalt, HHR
- Buick Rainier, LaCrosse, Lucerne
- Cadillac DTS
- Pontiac G6, Grand Prix
- Saab 9-7X
- And many more from 2006-2014.
Do I need to program this module after I receive it?
Do I need to program this module after I receive it?
No. This is the biggest benefit of our service. We pre-program the module to your vehicle’s specific VIN before it ships. It arrives ready for plug-and-play installation, saving you time and the high cost of dealership programming.
Where is the TCM located on my 2007 GMC Envoy?
On most 2006-2009 GMC Envoy models, the Transmission Control Module is located in the engine bay, on the left-hand (driver’s side) near the main fuse block or firewall.
Will this part fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. While this module often resolves the underlying issue causing the P0700, it’s always best to scan for more specific transmission codes (e.g., P07xx series) to confirm the diagnosis.
Is there a core charge for my old part?
No, there is no core charge required. You can keep your old part or dispose of it without the hassle of returning it.
What kind of warranty is included?
This module comes with a one-year warranty, giving you peace of mind and confidence in your repair.