Restore Smooth Shifting to Your GM Truck or SUV
If your 2006 GMC Envoy XL is experiencing harsh shifting, getting stuck in gear, or throwing transmission-related trouble codes, you’re likely dealing with a failing Transmission Control Module (TCM). As a mechanic with over two decades of experience under the hood, I’ve seen countless GM vehicles sidelined by this exact issue. The TCM is the brain of your automatic transmission, and when it fails, it can mimic the symptoms of a catastrophic transmission failure, causing unnecessary stress and diagnostic headaches. This OEM-quality T42 TCM, part number 24234503, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a hassle-free, plug-and-play installation.
A Technician’s Notebook
I remember a 2007 Silverado that came into my shop. The owner was convinced he needed a full transmission rebuild, quoted at over $3,000 by another shop. It was stuck in third gear (limp mode) and had a P0700 code. After a quick scan and checking the basics, my gut told me to look at the T42 module next to the battery. We swapped in a VIN-programmed unit just like this one, cleared the codes, and had him test driving in less than an hour. The truck shifted perfectly. He saved thousands of dollars by correctly diagnosing the electronic failure instead of condemning the mechanical components. That’s the power of replacing the right part, and this 2006 Envoy XL TCM is often that part.
Is Your Envoy Exhibiting These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement:
- âś” Abrupt, jerky, or delayed gear shifts.
- âś” The vehicle is stuck in a single gear, often referred to as “limp mode.”
- âś” Your Check Engine Light or Transmission Warning Light is on, with Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- âś” Failure to upshift or downshift, leading to poor acceleration and performance.
- âś” A noticeable decrease in fuel economy as the transmission operates inefficiently.
- âś” Intermittent loss of communication with the TCM, causing unpredictable behavior.
Your Step-by-Step Installation Guide
One of the best features of this module is its straightforward installation. You don’t need to be a master mechanic to get this done in your own driveway, typically in under 30 minutes. Because it’s pre-programmed, you completely bypass the need for an expensive trip to the dealership.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the TCM: On your 2006 Envoy XL, the TCM is found in the engine compartment on the left-hand (driver’s) side. In other GM models, it can be next to the battery, under the air cleaner box, or on a frame rail.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that may need to be gently pried up. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place to confirm a solid connection.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s best practice to use a basic OBD2 scan tool to clear any stored transmission codes from the vehicle’s memory. Start the vehicle and enjoy restored shifting performance.
Verified Fitment for Your General Motors Vehicle
This T42 TCM is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is compatible with part numbers 24242391, 24234503, and 24252114, among others. Please verify your specific model and year from the list below to ensure a perfect fit.
This part will fit these makes and models with these options:
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
ALLURE 06-09 Transmission; (lower air cleaner housing)
AVALANCHE 1500 07-08 Transmission; (next to battery)
CANYON 08-12 Transmission; (RH rear engine compartment)
COBALT 06-10 Transmission; (LH strut tower)
COLORADO 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
ENVOY 06-09 Transmission; (LH engine compartment)
EXPRESS 1500/2500/3500 VAN 06-14 Transmission; (RH engine compartment)
G5 07-10 Transmission; (LH strut tower)
G6 06-10 Transmission; (LH strut tower)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HHR 06-11 Transmission; (LH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
… and many more GM models from 2006-2014.
Do I need to take this 2006 Envoy XL TCM to the dealer for programming?
Do I need to take this 2006 Envoy XL TCM to the dealer for programming?
No. This is the biggest benefit of our service. We program the module to your vehicle’s VIN before shipping it to you. This makes the installation plug-and-play, saving you time and the high cost of dealership programming.
Is this a difficult part to install myself?
Not at all. For most DIYers with basic hand tools, this is a very straightforward job that takes less than 30 minutes. The module is typically easy to access in the engine bay.
What is a core charge? Do I need to send my old part back?
There is no core charge for this part. You can keep your old module or dispose of it yourself, saving you the hassle and expense of return shipping.
What kind of warranty is included?
We stand behind our products with a comprehensive one-year warranty. This gives you peace of mind that you are purchasing a quality, reliable part for your vehicle.