End Transmission Headaches and Get Back on the Road
Is your truck or SUV suffering from harsh, erratic shifting, delayed gear engagement, or a persistent check engine light? A failing Transmission Control Module (TCM) can turn a reliable vehicle into a source of constant stress. This genuine GM T42 TCM, service part number 24240449, is the definitive solution to restore the crisp, smooth performance you depend on. It arrives expertly programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and ensuring a true plug-and-play installation.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty TCM is the likely culprit. This module is engineered to resolve these exact problems:
- Harsh or Slipping Gears: Abrupt, jerky shifts or a feeling that the transmission is slipping between gears.
- Limp Mode: Your vehicle is stuck in a single gear (often 2nd or 3rd) with severely limited power.
- Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dash.
- Diagnostic Trouble Codes (DTCs): Common codes like P0700, P0750, or other solenoid-related faults are stored in the computer.
- No Shifting: The transmission fails to upshift or downshift as you accelerate or decelerate.
- Poor Fuel Economy: Inefficient shifting leads to a noticeable drop in your vehicle’s MPG.
Installing this pre-programmed 2006-2009 GMC Envoy TCM is the most direct way to fix these issues and regain control of your vehicle’s performance.
Features & Benefits
- ✔ VIN Programmed for Your Vehicle: We program the module with the latest GM software using your vehicle’s VIN. This ensures perfect communication between the TCM and your vehicle’s other systems for optimal shift patterns and performance right out of the box.
- ✔ No Dealership Required: Because the unit is pre-programmed, you can skip the costly and time-consuming trip to the dealer for programming. It’s ready for installation upon arrival.
- ✔ Restores Smooth Operation: By precisely managing shift points, torque converter lockup, and line pressure, this module eliminates harsh shifting and restores the factory ride quality.
- ✔ Broad GM Compatibility: This T42 module is a direct replacement for a wide range of popular GM trucks, vans, and SUVs, including the Silverado, Tahoe, Sierra, Yukon, Express, and many more. It interchanges with numerous part numbers like 24252114, 24234503, and 24240449.
- ✔ Built to OEM Standards: This is not a cheap knock-off. It’s a quality component designed to meet or exceed General Motors’ strict specifications for durability and reliability.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: The Power of Pre-Programming
As a technician with over 20 years of experience, I’ve seen countless drivers waste time and money on un-programmed or incorrectly programmed modules. A blank TCM is just a metal box; it’s the software that makes it work. Our VIN-specific programming process ensures the module has the correct calibration for your vehicle’s engine, tire size, and axle ratio. This prevents common post-installation issues like incorrect shift points or false error codes, giving you a first-time fix and true peace of mind. This isn’t just a part; it’s a complete, ready-to-install solution for your 2006-2009 GMC Envoy TCM.
Frequently Asked Questions
What does a Transmission Control Module (TCM) do?
The TCM is the electronic brain of your automatic transmission. It collects data from various sensors in the engine and transmission to control shift solenoids, regulate fluid pressure, and engage the torque converter, ensuring smooth and efficient gear changes.
Do I need to get this module programmed by a dealer?
No. The main benefit of our service is that this 2006-2009 GMC Envoy TCM arrives at your door fully programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, saving you hundreds of dollars in dealership programming fees.
How difficult is the installation?
Installation is typically straightforward for a DIY mechanic. The TCM is usually located in the engine bay (e.g., next to the battery, on the strut tower, or under the air cleaner box). The process involves disconnecting the battery, unplugging the electrical connectors, unbolting the old module, and installing the new one. It often takes less than 30 minutes.
Will this fit vehicles other than the GMC Envoy?
Yes, absolutely. This T42 TCM is compatible with a massive range of 2006-2014 GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. This includes popular models like the Chevrolet Silverado, Tahoe, Suburban, GMC Sierra, Yukon, and many others. Please check the detailed fitment list on this page.
Is there a core charge for my old part?
No, there is no core charge required for this module. You can keep your old part without the hassle of returning it.