Fix Your Envoy’s Shifting Problems with a Pre-Programmed TCM
If you’re dealing with a 2006-2009 GMC Envoy that’s shifting harshly, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen countless GM vehicles with these exact symptoms. More often than not, the culprit isn’t a catastrophic transmission failure, but a faulty Transmission Control Module (TCM). This direct-fit T42 TCM, part number 24235753, is the reliable, cost-effective solution you need to restore your vehicle’s performance and peace of mind.
The TCM is the brain of your automatic transmission, responsible for controlling shift points, torque converter clutch engagement, and line pressure. When it fails, communication breaks down, leading to the frustrating and sometimes dangerous issues you’re experiencing. This module arrives expertly programmed to your Envoy’s specific Vehicle Identification Number (VIN), eliminating the need for an expensive trip to the dealership for programming. It’s a true plug-and-play fix designed for both professional mechanics and determined DIYers.
From the Diagnostic Bay
I remember a customer with a 2008 Envoy who was convinced he needed a full transmission rebuild. His truck would slam into gear and was stuck in limp mode. He’d been quoted over $3,000 for the job. After hooking up my scan tool, I saw a classic P0753 Shift Solenoid ‘A’ Electrical code, but the solenoid itself tested fine. The real issue was a failing driver circuit inside the original TCM. We installed one of these VIN-programmed modules, and in under an hour, his Envoy was shifting like new. He saved thousands and drove away with a reliable vehicle. That’s the power of a correct diagnosis and the right part.
Is Your Envoy Showing These Transmission Symptoms?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement. Addressing it now with a quality 2006-2009 Envoy TCM can prevent further damage to your transmission.
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ The vehicle is stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction), P0750-P0758 (Solenoid codes), or communication errors.
- ✔ A sudden drop in fuel economy.
- ✔ The transmission seems to slip or fails to engage from Park to Drive/Reverse.
A Straightforward Guide to Installation
Replacing the TCM on your GMC Envoy is a job most people with basic tools can complete in their own driveway. This module is typically located in the engine compartment for easy access.
- 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 Envoy, the TCM is usually found 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 and remove it from the vehicle.
- Install the New TCM: Mount the new, VIN-programmed TCM onto the bracket and securely fasten the bolts. Reconnect the wiring harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s best practice to use a scan tool to clear any stored DTCs from the system’s memory. Start the vehicle and test drive to confirm smooth shifting.
Verified Vehicle Compatibility
While this is the primary replacement for the 2006-2009 GMC Envoy, this versatile T42 module fits a wide range of GM vehicles. Please verify your specific model and options below. This part is interchangeable with service numbers 24242391, 24234503, 24252114, and many others.
- GMC Envoy: 2006-2009 (LH engine compartment)
- GMC Sierra & Yukon: 2007-2013 (Typically next to the battery)
- Chevrolet Silverado & Tahoe: 2007-2013 (Typically next to the battery)
- Chevrolet Trailblazer: 2006-2009 (LH engine compartment)
- Cadillac, Buick, Pontiac, Saturn, Hummer, and Saab models: See the full fitment list for specific years and locations.
Does this 2006-2009 Envoy TCM require programming?
Does this 2006-2009 Envoy TCM require programming?
No, it does not. We program the module to your vehicle’s VIN before shipping. This ensures it is ready for immediate installation right out of the box, with no need for a scan tool or a visit to the dealership.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old part or dispose of it at your convenience without the hassle of sending it back.
What kind of warranty is included?
This transmission control module is backed by our comprehensive one-year warranty, giving you confidence and protection for your repair.
Will this 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 a faulty TCM is a very common cause, this code indicates a more specific code is stored in the TCM itself. This module often resolves the underlying issue (like solenoid circuit faults) that triggers the P0700.
Where is the TCM located on a 2007 GMC Envoy?
On the 2006-2009 GMC Envoy, the Transmission Control Module is consistently located in the engine compartment on the driver’s side (LH side), usually mounted near the firewall or inner fender.