Is Your GMC Envoy’s Transmission Giving You Headaches?
As a tech with two decades of experience under the hood, I’ve seen it all. A reliable SUV like the GMC Envoy suddenly starts shifting hard, gets stuck in second gear, or flashes a check engine light that just won’t quit. Itโs frustrating and can make you lose confidence in your vehicle. The problem often isn’t the transmission itself, but its electronic brain: the Transmission Control Module (TCM). This component is the key to restoring the smooth, predictable performance you depend on.
The Direct-Fit Solution for Your 2006-2009 Envoy Transmission Control Module
Forget expensive dealership diagnostics and programming fees. This T42 TCM is the definitive solution, arriving at your door pre-programmed to your Envoy’s specific Vehicle Identification Number (VIN). It’s designed to directly replace part number 24235754 and others, resolving the root cause of many common transmission issues without any extra steps.
A Real-World Scenario from My Shop
Just last month, a 2008 Envoy was towed in, stuck in ‘limp mode’โthe owner couldn’t get it to shift past 3rd gear. The dash was lit up with a check engine light, and my scan tool pulled a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). While the solenoid code pointed to a specific part, my experience told me to check the controller first. After confirming the wiring was solid, we swapped in one of our VIN-programmed T42 modules. In less than 30 minutes, the codes were cleared, the vehicle was shifting perfectly through all gears, and the customer drove away, saving hundreds compared to a dealership visit.
Is Your GMC Envoy Showing These Signs of TCM Failure?
- โ๏ธ Harsh Shifting & Delayed Engagement: Experiencing jarring clunks when the transmission shifts or a long pause when moving from Park to Drive?
- โ๏ธ Stuck in Limp Mode: Is the vehicle refusing to shift, often stuck in 2nd or 3rd gear, making it difficult to drive at normal speeds?
- โ๏ธ Warning Lights: Are the Check Engine Light or a specific transmission warning light illuminated on your dashboard?
- โ๏ธ Erratic Performance: Unpredictable upshifts or downshifts, poor acceleration, and a noticeable drop in fuel economy are classic symptoms.
- โ๏ธ Diagnostic Trouble Codes (DTCs): Common codes like P0700, P0750-P0758, or other solenoid-related faults often point directly to a faulty TCM.
Plug-and-Play Installation: No Dealer Visit Required
This is a repair you can confidently tackle in your own garage. For the 2006-2009 GMC Envoy, the TCM is conveniently located in the LH (driver’s side) engine compartment, making access straightforward.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Old Module: Find the TCM on the driver’s side of the engine bay. It will have several electrical connectors attached.
- Swap the Modules: Carefully disconnect the wiring harnesses and unbolt the old TCM. Mount the new module in its place and securely reconnect the harnesses.
- Final Steps: Reconnect the 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 vehicle’s memory.
Frequently Asked Questions (FAQ)
- Q: What does ‘VIN Programmed’ actually mean?
- A: It means we load your vehicle’s specific VIN into the module before shipping. This ensures it has the correct software and calibrations for your Envoy’s engine, transmission, and options, making it work perfectly right out of the box.
- Q: Will this fix a P0700 trouble code?
- A: A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the underlying cause (like internal circuit failure), you should always ensure the issue isn’t a simple wiring or sensor problem first.
- Q: Do I need any special tools for this installation?
- A: No special tools are required. Basic hand tools like a socket set to remove the mounting bolts and disconnect the battery are all you’ll need for the physical installation.
- Q: Is there a core charge for my old part?
- A: Absolutely not. We don’t require you to send your old, faulty module back. This saves you time and the hassle of return shipping.
Guaranteed Fitment & Part Number Interchange
This module is a direct replacement for a wide range of GM vehicles and is guaranteed to function correctly. It interchanges with the following part numbers:
24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24252114, 24255280, 24256960, 24235732, 24235753, 24240449, YNXS.