Restore Flawless Shifting to Your GMC Envoy XL
Is your 2006 GMC Envoy XL suffering from erratic shifting, getting stuck in gear, or throwing transmission codes? These are classic signs of a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make driving frustrating and even unsafe. This T42 TCM, a direct replacement for part number 24235754, is the definitive solution to restore your vehicle’s performance and reliability.
With over 20 years of hands-on diagnostic experience, I’ve seen countless drivers worry they need a full transmission rebuild when the real culprit is this module. A failing TCM can mimic major mechanical failures, but the fix is often surprisingly simple. Our module comes pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits for programming. It’s a true plug-and-play fix designed for both professional technicians and determined DIYers.
A Technician’s Notebook
I remember a customer with a 2006 Envoy XL who was at his wit’s end. His SUV would shift perfectly for days, then suddenly start slamming into gear and get stuck in limp mode (3rd gear only). He’d already replaced a couple of solenoids with no luck. The scanner showed a generic P0700 code and an intermittent solenoid circuit code that would come and go. After confirming the wiring harness was intact, we pinpointed the T42 TCM. The internal circuitry was failing under thermal stress. We installed one of our VIN-programmed modules, and the problem was solved instantly. He saved over a thousand dollars by avoiding an unnecessary transmission teardown.
Is Your Envoy XL Showing These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission shutdown. Watch out for these early warning signs. Addressing them promptly can prevent further damage to your transmission.
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ The vehicle is stuck in “limp mode” and won’t shift out of a single gear.
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other transmission-related DTCs.
- ✔ Inability to upshift or downshift, leading to poor acceleration and performance.
- ✔ A noticeable decrease in fuel economy.
- ✔ Intermittent loss of communication with the module, causing unpredictable behavior.
Your 30-Minute Path to a Smooth Ride
Installing your new 2006 Envoy XL Transmission Control Module is a straightforward job that you can complete in your own driveway. No specialized tools are required.
- 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 your 2006 Envoy XL with the 8-cylinder engine, the TCM is found in the left-hand (driver’s side) engine compartment. It’s a silver box with electrical connectors.
- Swap the Part: Carefully unplug the electrical connectors. Then, unbolt the old module from its mounting bracket. Secure the new module in place and firmly reconnect the wiring harnesses.
- Final Steps: Reconnect the battery terminal. While the module is pre-programmed, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the engine and take a test drive to confirm smooth shifting.
Will This Fit My Vehicle?
This T42 TCM is guaranteed to fit a wide range of General Motors vehicles. Please verify the location notes for your specific model.
- ENVOY (8 cylinder): 2006-2007 (LH engine compartment)
- ENVOY XL (8 cylinder): 2006 (LH engine compartment)
- TRAILBLAZER (8 cylinder): 2006-2007 (LH engine compartment)
- TRAILBLAZER EXT (8 cylinder): 2006 (LH engine compartment)
- CHEVROLET SILVERADO & GMC SIERRA (1500/2500): 2007-2013 (next to battery)
- CHEVROLET TAHOE / SUBURBAN & GMC YUKON / YUKON XL: 2007-2009 (next to battery)
- CHEVROLET EXPRESS & GMC SAVANA VANS (1500/2500/3500): 2006-2014 (RH engine compartment)
- BUICK LACROSSE / ALLURE / LUCERNE: 2006-2011 (lower air cleaner housing or LH engine compartment)
- CADILLAC DTS: 2006-2011 (RH front engine compartment)
- PONTIAC G6 / GRAND PRIX: 2006-2010 (LH strut tower or lower air cleaner housing)
- SATURN VUE / AURA / ION: 2006-2010 (various locations, check list)
- …and many more models. This module interchanges with part numbers 24252114, 24234503, 24235754, and others.
Frequently Asked Questions
Do I need to take this module to the dealer for programming?
No. We program the module to your vehicle’s VIN before shipping. It arrives ready for plug-and-play installation, saving you time and money.
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 without the hassle of sending it back.
Will this fix my transmission if it’s slipping?
This module corrects electronic shifting problems like harsh shifts, delayed engagement, and limp mode. If your transmission is mechanically slipping due to worn clutches, this part will not solve that. However, many electronic faults are often misdiagnosed as mechanical slipping.
What is the warranty on this part?
This Transmission Control Module comes with a one-year warranty, giving you peace of mind and confidence in your repair.
How do I provide my VIN for programming?
You can enter your vehicle’s 17-digit VIN during the checkout process. This ensures we load the correct software for your specific Envoy XL.