If your 2006 GMC Envoy XL is suffering from erratic shifting, 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 firsthand how a failing Transmission Control Module (TCM) can bring an otherwise reliable vehicle to a standstill. This isn’t just an inconvenience; it’s a critical failure that compromises performance and safety. This T42 TCM, part number 24239224, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play fix.
The TCM is the brain of your automatic transmission, controlling everything from shift points to torque converter lockup. When it fails, communication breaks down, leading to the frustrating symptoms you’re likely experiencing. Our module restores that crucial link, ensuring your 4L60E, 4L65E, or 4L70E transmission operates exactly as the manufacturer intended. Forget the expensive dealership visit and the hassle of post-installation programming—this module is ready to install right out of the box.
A Technician’s Notebook
I remember a 2007 Silverado that came into the shop stuck in ‘limp mode’ (3rd gear only). The owner had already replaced two shift solenoids, chasing a P0750-series code with no luck. The scan tool showed intermittent communication loss with the TCM. Engine bay heat is the number one enemy of these modules. Over years of heat cycles, internal solder joints and electronic components degrade, causing unpredictable behavior. We installed one of our VIN-programmed T42 modules, cleared the codes, and the truck was shifting perfectly on the first test drive. This isn’t just about replacing a part; it’s about providing a lasting solution that addresses the root cause.
Is Your Envoy XL Showing These Symptoms?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your 2006 Envoy XL TCM needs replacement:
- âś” Harsh, delayed, or unpredictable gear shifts.
- âś” The vehicle is stuck in one gear (often called ‘limp mode’).
- âś” Check Engine Light or Transmission Warning Light is on.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Errors), or other communication codes.
- âś” Failure to upshift or downshift correctly.
- âś” A noticeable drop in fuel economy.
- âś” Complete loss of transmission function.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation. For the DIY mechanic, this is a job you can complete in your driveway in under 30 minutes with basic hand tools. On your 2006 Envoy XL with the 8-cylinder engine, the TCM is located in the left-hand (driver’s side) engine compartment.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: Find the TCM in the LH engine compartment. It will have several large electrical connectors attached to it.
- Disconnect and Remove: Carefully unclip the wiring harnesses. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses. You’ll hear a ‘click’ when they are properly seated.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Vehicle Compatibility
While this is the correct 2006 Envoy XL TCM, this versatile T42 module is also a direct-fit replacement for a wide range of other General Motors vehicles. It is interchangeable with part numbers 24252114, 24234503, 24239224, and more. Below is a partial list of compatible models:
- âś” GMC Envoy / Envoy XL / Trailblazer / Trailblazer EXT (2006-2009): 8-cylinder models, located in LH engine compartment.
- âś” Chevrolet Silverado & GMC Sierra 1500/2500 (2007-2013): Located next to the battery.
- âś” Chevrolet Tahoe & GMC Yukon (2007-2009): Found next to the battery.
- âś” Chevrolet Express & GMC Savana Vans (2006-2014): Located in the RH engine compartment.
- âś” Chevrolet Impala / Monte Carlo & Buick LaCrosse (2006-2011): Typically found under the lower air cleaner housing.
- âś” Pontiac G6 / Saturn Aura / Chevrolet Cobalt (2006-2010): Located on or near the LH strut tower.
- âś” Hummer H3 (2008-2010): Found in the RH rear of the engine compartment.
What does ‘VIN Programmed’ actually mean?
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM-certified software onto the module before we ship it. This ensures it communicates perfectly with your vehicle’s engine computer and other systems, just like the original part. It eliminates the need for expensive programming at a dealership.
Do I need to send my old TCM back (core charge)?
No, there is no core charge for this part. You can keep your old module or dispose of it, saving you the time and hassle of a return shipment.
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. In many cases where the TCM itself has failed, replacing it with this programmed unit will resolve the underlying issue causing the P0700 code and other related transmission codes.
What kind of warranty is included?
This module is backed by our one-year, hassle-free warranty. We stand by the quality and reliability of our parts to give you peace of mind with your repair.