Is Your 2006 Envoy XL Shifting Erratically?
If you’re dealing with harsh shifting, delayed gear engagement, or a check engine light that points to transmission trouble, your Transmission Control Module (TCM) is the likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for every gear change and torque converter operation. When it fails, it can leave your 2006 GMC Envoy XL feeling unpredictable and unsafe, sometimes even stuck in ‘limp mode.’ This replacement GM T42 TCM, service number 24256960, is the definitive solution to restore your vehicle’s factory performance and drivability.
From the Diagnostic Bay
We had a 2006 Envoy XL come into the shop with classic symptoms of a failing transmission—banging into gear and refusing to shift past 3rd. The owner had already spent a small fortune replacing two shift solenoids based on the trouble codes, but the problem persisted. A quick scan confirmed the solenoid codes were still present, but live data showed the TCM wasn’t commanding them correctly. We installed one of our VIN-programmed T42 modules, cleared the codes, and the Envoy shifted like it just rolled off the assembly line. It’s a common story: the codes often point to a symptom, but the root cause is the module itself.
Symptoms of a Failing 2006 Envoy XL TCM
- ✔ Unpredictable, harsh, or delayed gear shifts.
- ✔ The vehicle gets stuck in a single gear (limp mode) to protect the transmission.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are stored.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the module, preventing the vehicle from starting or shifting out of park.
The Plug-and-Play Solution for Your Transmission Problems
Don’t let a faulty module sideline your vehicle. Our T42 TCM comes pre-programmed directly to your Envoy XL’s Vehicle Identification Number (VIN). This critical step ensures that the module has the latest GM software and is perfectly calibrated for your specific vehicle configuration, including engine size and axle ratio. The result is a seamless, plug-and-play installation that requires no expensive trips to the dealership for additional programming. Simply install the part, clear any old codes, and get back on the road with confidence. Built to strict OEM specifications, this module ensures long-lasting reliability and restores the smooth, efficient operation you expect from your truck.
This module is a direct replacement for a wide range of part numbers, including 24252114, 24234503, 24230461, and 24256960, making it a versatile solution for many GM trucks, vans, and SUVs from 2006-2014 equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
Frequently Asked Questions
Do I need to program this 2006 Envoy XL TCM?
No. This module is sold with VIN programming included. We flash it with your vehicle’s specific VIN before shipping, so it arrives ready for a plug-and-play installation without needing a trip to the dealer.
Where is the TCM located on a 2006 GMC Envoy XL?
On the 2006 Envoy XL with an 8-cylinder engine, the Transmission Control Module is typically located in the engine compartment on the left-hand (driver’s) side.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the underlying issues that cause a P0700, it’s essential to diagnose any other related codes. In many cases, a failing TCM is the root cause.
What tools are needed for installation?
Installation is straightforward and usually requires basic hand tools like a socket set to remove the mounting bolts and disconnect the electrical connectors. It’s also recommended to disconnect the vehicle’s battery before starting and use a basic OBD2 scan tool to clear any stored codes after the new module is installed.
Is there a core charge for my old part?
No, we do not require a core charge. You can keep your old part, eliminating the hassle and expense of shipping it back.