Restore Flawless Shifting to Your 2006 GMC Envoy XL
If you’re dealing with the frustration of a transmission that seems to have a mind of its own—slamming into gear, refusing to shift, or putting your SUV into a crippling limp mode—you’re not alone. As a technician with over two decades of experience, I’ve seen countless GM vehicles, from hardworking Sierra trucks to family-hauling Envoys, sidelined by a failed Transmission Control Module (TCM). The T42 TCM, part number 24235732, is the electronic brain of your automatic transmission, and when it fails, it can mimic a catastrophic mechanical failure. But often, the fix is much simpler and more affordable than a full transmission replacement.
This OEM-quality T42 TCM is the definitive solution for your 2006 Envoy XL Transmission Module issues. We take the guesswork and dealership hassle out of the equation. Before we ship it, our experts program the module with your vehicle’s specific VIN and the latest GM software updates. This means it arrives at your door ready for a true plug-and-play installation, instantly restoring communication between your engine and transmission for smooth, reliable performance.
Case Study: A Tricky Diagnosis
A customer brought in his 2008 Chevy Silverado, convinced his 4L60E transmission was shot. It was stuck in 3rd gear (limp mode) and throwing a P0752 code for Shift Solenoid A Stuck On. He was quoted over $2,500 for a transmission rebuild. I hooked up my scan tool and saw erratic data from the TCM. Knowing these T42 modules are prone to failure from heat and vibration, I suggested we try a programmed module first. We swapped in a new VIN-programmed TCM in about 20 minutes. After clearing the codes, the truck shifted perfectly through all gears. The customer saved thousands of dollars and a week of downtime, all thanks to a correct diagnosis pointing to the TCM, not the transmission itself.
Is Your Envoy XL Showing These Telltale Signs?
A failing 2006 Envoy XL Transmission Module can cause a variety of symptoms that are often misdiagnosed. If you’re experiencing any of the following, your TCM is the likely culprit:
- âś” Jarring, harsh, or delayed gear shifts.
- âś” The transmission feels like it’s slipping between gears.
- âś” Your vehicle is stuck in a single gear (often 2nd or 3rd) and won’t shift up or down.
- âś” The Check Engine Light or a specific transmission warning light is illuminated on your dash.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as the general P0700 (Transmission Control System Malfunction) or specific solenoid codes (e.g., P0750-P0758).
- âś” A noticeable drop in fuel economy or the transmission running hotter than usual.
DIY-Friendly Installation in Under 30 Minutes
One of the best features of this part is its straightforward installation. You don’t need a lift or specialized transmission tools. For the 2006 GMC Envoy XL, the TCM is typically located in the left-hand (driver’s side) engine compartment, making it easily accessible.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s electronic systems.
- Locate the Module: Find the TCM in the LH engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses. You should hear a click as they lock in.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and allow it to idle for a moment. Use a basic OBD2 scan tool to clear any stored fault codes, and then take a test drive to confirm that shifting performance is restored.
Verified Fitment for Your GM Vehicle
This T42 TCM, also known by service numbers 24242391, 24234503, and 24252114, is a direct replacement for a wide range of General Motors cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page is focused on the 2006 Envoy XL Transmission Module, it also fits the following models:
- GMC: Envoy (06-09), Sierra 1500/2500 (07-13), Yukon / Yukon XL (07-09), Savana 1500/2500/3500 (06-14), Canyon (08-12)
- Chevrolet: Silverado 1500/2500 (07-13), Tahoe (07-09), Suburban 1500 (07-08), Avalanche 1500 (07-08), Express 1500/2500/3500 (06-14), Trailblazer (06-09), Impala (06-11), Monte Carlo (06-07), Cobalt (06-10), HHR (06-11), Colorado (08-12), SSR (05-06)
- Buick: LaCrosse (06-09), Lucerne (06-11), Allure (06-09), Rainier (06-07), Rendezvous (06-07)
- Cadillac: DTS (06-11)
- Pontiac: G6 (06-10), Grand Prix (06-08), G5 (07-10), Pursuit (06)
- Saturn: Vue (07-10), Aura (07-09), Ion (06-07)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
Frequently Asked Questions
Do I need to take my vehicle to a dealership after installing this part?
No. The main benefit of our service is that this module comes fully programmed to your vehicle’s VIN. This eliminates the need for expensive dealership programming. It’s a plug-and-play solution.
How do I provide my VIN for programming?
After you place your order, you will be prompted to enter your vehicle’s 17-digit VIN. Please double-check it for accuracy, as the programming is specific to this number.
Is this a new or used part?
This is an OEM-quality replacement part built to meet or exceed original factory specifications. It is not a used part pulled from a salvage vehicle. It comes with a one-year warranty for your peace of mind.
What happens if I keep driving with a bad TCM?
Continuing to drive with a faulty TCM can cause more than just poor performance. It can lead to increased wear on your transmission’s mechanical parts, such as clutches and bands, due to improper hydraulic pressure and shift timing. This can eventually lead to complete transmission failure, a much more expensive repair.
Does this part require a core charge?
No, there is no core charge for this module. You can keep your old part, eliminating the hassle and expense of shipping it back.