If you’re dealing with the frustration of a 2006 GMC Envoy XL that’s shifting erratically, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen countless GM vehicles sidelined by a faulty Transmission Control Module (TCM). This isn’t just an inconvenience; it’s a critical failure that can affect your vehicle’s drivability and safety. This T42 TCM, part number 24235753, is the reliable, pre-programmed solution to get your SUV back on the road with the smooth performance you expect.
The TCM is the brain of your automatic transmission, controlling everything from shift points to torque converter clutch engagement. When it fails, the symptoms can be alarming. This module is a direct-fit replacement, engineered to meet or exceed original equipment specifications. The best part? We handle the programming for you. Simply provide your vehicle’s VIN at checkout, and we’ll flash the module with the latest GM software updates specific to your Envoy XL. This eliminates the need for an expensive trip to the dealership for programming, making it a perfect project for both seasoned mechanics and determined DIYers.
A Technician’s Notebook
I remember a 2006 Envoy XL that came into the shop with classic symptoms: harsh 1-2 shift and intermittent ‘limp mode.’ The owner had already spent a small fortune replacing shift solenoids based on a generic code reader’s output, but the problem persisted. After a quick scan with professional equipment, we confirmed communication errors with the TCM. The internal circuitry had failed—a common issue in these T42 modules due to heat and vibration. We installed one of our VIN-programmed modules, and in less than 30 minutes, the truck was shifting like it just rolled off the factory line. It’s a prime example of why correctly diagnosing the root cause saves time and money, and often, the TCM is the real culprit.
Is Your Envoy XL Showing These Telltale Signs?
- ✔ Harsh, slamming, or unpredictable gear shifts.
- ✔ The vehicle is stuck in a single gear (often called ‘limp mode’).
- ✔ Your Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid circuit faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel economy or a transmission that seems to be overheating.
- ✔ Complete loss of communication with the transmission module.
Your Straightforward Installation Guide
Replacing the 2006 Envoy XL TCM is a job you can tackle with basic hand tools. For this specific model, you’ll find it in the engine compartment on the left-hand (driver’s) side.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: On your 2006 Envoy XL (with the 8-cylinder engine), the TCM is mounted in the LH engine compartment.
- 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, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock in.
- Final Steps: Reconnect the battery terminal. While our programming handles the heavy lifting, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU. Start the vehicle and test drive to confirm smooth shifting.
Verified Compatibility Across GM Models
This T42 TCM is a direct replacement for part number 24235753 and is interchangeable with a wide range of other service numbers. It is designed for many GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page is focused on the 2006 Envoy XL TCM, this part also fits:
This part will fit these makes and models with these options
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
SAVANA 1500/2500/3500 VAN 06-14 Transmission; (RH engine compartment)
VUE 07-10 Transmission; (various locations)
G5 07-10 Transmission; (LH strut tower)
SIERRA & SILVERADO 1500/2500 07-13 Transmission; (next to battery)
LUCERNE 06-11 Transmission; (LH engine compartment)
TAHOE / YUKON / SUBURBAN 07-09 Transmission; (next to battery)
IMPALA 06-11 Transmission; (lower air cleaner housing)
TRAILBLAZER 06-09 Transmission; (LH engine compartment), (8 cylinder)
…and many more models from Chevrolet, Buick, Pontiac, Cadillac, Saturn, Hummer, and Saab. Please use our vehicle selector tool to confirm exact fitment.
Frequently Asked Questions
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This is the biggest benefit of our service. We pre-program the module to your vehicle’s specific VIN before shipping. It arrives ready for plug-and-play installation, saving you hundreds in dealership fees and towing costs.