Restore Flawless Shifting to Your GM Vehicle
If your 2006 GMC Envoy XL is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’re not just dealing with an annoyance—you’re facing a critical reliability issue. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Transmission Control Module (TCM) can sideline an otherwise perfectly good vehicle. This T42 TCM, part number 24234503, is the definitive, hassle-free solution to get your truck back to operating as it should.
The biggest headache with replacing electronic modules has always been the expensive and time-consuming trip to the dealership for programming. We eliminate that step entirely. By providing us with your vehicle’s VIN during checkout, we program the module specifically for your Envoy XL. This means when it arrives, it’s ready for a true plug-and-play installation, instantly restoring communication and precise control over your 4L60E, 4L65E, or 4L70E transmission.
Case Study: A Tricky Diagnosis
A customer brought in a 2007 Chevy Tahoe with classic symptoms: harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The codes were all over the place—a generic P0700 and a few intermittent solenoid codes. The owner had already replaced two shift solenoids with no change. After checking the wiring harness for damage, we suspected the TCM. The intermittent nature of the problem pointed to an internal electronic failure within the module, a common issue I’ve diagnosed on hundreds of these GM platforms. We installed one of our pre-programmed T42 modules, cleared the codes, and the Tahoe was shifting perfectly within an hour. It’s a textbook example of how a faulty 2006 Envoy XL TCM can mimic other transmission problems, making this part the correct first-time fix.
Is Your Envoy Exhibiting These Telltale Signs?
A failing TCM doesn’t always mean a complete transmission failure. Often, it presents as a series of frustrating electrical and performance issues. If you’re noticing any of the following, your TCM is the likely culprit:
- ✔ Abrupt, harsh, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle enters “limp mode,” refusing to shift out of a single gear (usually 2nd or 3rd).
- ✔ Your Check Engine Light or Transmission Warning Light is on, with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ Unexplained transmission overheating or strange electrical behavior tied to shifting.
Your 30-Minute Path to a Smooth Ride
One of the best features of this module is its straightforward installation. For a DIYer with basic tools, this is a job you can complete in your driveway in under 30 minutes. Here’s a general guide for replacing your 2006 Envoy XL TCM:
- Safety First: Before you begin, disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the vehicle’s computer systems.
- Locate the Module: On the 2006 Envoy XL (and similar models like the Trailblazer), the TCM is typically found in the engine compartment on the driver’s side (LH). Check near the firewall or inner fender.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs, so be gentle. Once disconnected, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed TCM into place. Reconnect the electrical connectors, ensuring they click securely into place.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the system’s memory. Start the vehicle and enjoy smooth, responsive shifting!
Verified Compatibility for Your GM Vehicle
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors cars, trucks, and SUVs. It is interchangeable with part numbers 24252114, 24234503, 24230461, 24242391, and more. Please verify your vehicle’s fitment from the list below:
This part will fit these makes and models with these options
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
TRAILBLAZER EXT 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)
EXPRESS/SAVANA VANS 06-14 Transmission; (RH engine compartment)
G5/PURSUIT 06-10 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)
ION 06-07 Transmission; (behind LH strut tower)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 06-11 Transmission; (LH engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
MONTANA/UPLANDER/TERRAZA/RENDEZVOUS 06-09 Transmission
SAAB 9-7X 06-09 Transmission; (LH engine compartment)
SIERRA/SILVERADO 1500/2500 07-13 Transmission; (next to battery)
SSR 05-06 Transmission; (front LH frame)
SUBURBAN/TAHOE/YUKON 07-09 Transmission; (next to battery)
VUE 07-10 Transmission; (LH front engine compartment)
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
Absolutely not. This is the main benefit of our service. We pre-program the module to your vehicle’s specific VIN before shipping it. This makes the installation plug-and-play, saving you hundreds of dollars and a trip to the dealership.
Is this a new or used part?
This is a high-quality, OEM-standard component that has been thoroughly inspected and prepared to meet or exceed original factory performance. It is backed by our one-year warranty for your peace of mind.
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. While this part often resolves the underlying issue causing the P0700, you should scan for more specific transmission codes (e.g., P0753) to confirm the diagnosis. In most cases involving erratic shifting, a faulty TCM is the root cause.
What is a core charge, and do I have to pay one?
A core charge is a deposit you pay until you return your old part. We do not require a core charge for this module. You can keep or dispose of your old part without any hassle or additional cost.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure perfect programming for your 2006 Envoy XL TCM.