Restore Smooth, Reliable Shifting to Your Suburban 1500
If you’re dealing with the headaches of a failing transmission control module—like harsh bangs into gear, getting stuck in limp mode, or a persistent check engine light—you know how frustrating it can be. As the electronic brain of your automatic transmission, the TCM is responsible for every shift. When it fails, your dependable Suburban can feel unpredictable and unsafe. This T42 Transmission Control Module is the definitive solution, pre-programmed to your vehicle’s VIN for a seamless, plug-and-play repair.
A Technician’s Notebook
Case Study: The Intermittent Limp Mode. A customer brought in their ’08 Suburban 1500 with a ghost-in-the-machine problem. It would drive perfectly for days, then suddenly refuse to shift past 2nd gear. No warning, just a check engine light and limp mode. After checking the wiring and solenoids, which all tested fine, we focused on the TCM. These modules, especially the T42 generation, can develop internal circuit faults from years of heat cycles. We swapped in a VIN-programmed module, and the problem vanished. It’s a classic example of how the 2007-2008 Suburban 1500 TCM can fail intermittently, making diagnosis tricky for the uninitiated.
Is Your Suburban Showing These Telltale Signs?
A faulty TCM doesn’t always mean total transmission failure. Often, it presents as a series of electronic glitches. If you’re experiencing any of the following, your TCM is the likely culprit:
- âś” Abrupt, harsh, or delayed gear shifts.
- âś” The vehicle is stuck in a single gear (often called ‘limp mode’).
- âś” Check Engine Light is on with transmission-specific Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related codes.
- âś” Inability to upshift or downshift correctly, leading to poor acceleration.
- âś” A noticeable drop in fuel economy.
- âś” Complete loss of communication with the transmission.
Your Straightforward TCM Installation Guide
One of the best features of this module is its simple installation. You don’t need a lift or specialized transmission tools. For your 2007-2008 Suburban 1500, the process is quick and can be done in your driveway in under 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On your Suburban, the TCM is conveniently located in the engine bay, right next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always good practice to use a basic OBD2 scan tool to clear any stored fault codes from the previous failure. Start the vehicle and enjoy restored performance!
Verified Fitment for Your GM Vehicle
This T42 TCM is a direct-fit replacement for a wide range of General Motors cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page is dedicated to the 2007-2008 Suburban 1500 TCM, it is also confirmed to fit many other models. Key compatible vehicles include:
- Chevrolet Suburban 1500 (2007-2008): Located next to the battery.
- Chevrolet Silverado / GMC Sierra 1500 (2007-2013): Located next to the battery.
- Chevrolet Tahoe / GMC Yukon (2007-2009): Located next to the battery.
- Chevrolet Express / GMC Savana Vans (2006-2014): Located in the RH engine compartment.
- Hummer H3 (2008-2010): Located in the RH rear engine compartment.
- Chevrolet Impala (2006-2011): Located under the lower air cleaner housing.
This part is interchangeable with service numbers 24242391, 24234503, 24252114, 24235732, and more, ensuring broad compatibility.
Frequently Asked Questions
Do I need to take this part to the dealer for programming?
No. This is the biggest benefit. We program the module to your vehicle’s specific VIN before shipping. This means it arrives ready for installation, saving you the time and expense of a dealership visit.
Is this a difficult part for a DIYer to install?
Not at all. For the Suburban 1500, the TCM is easily accessible in the engine bay. With basic hand tools, the swap typically takes less than half an hour. Just follow our installation guide.
What is the warranty on this module?
This module is backed by our one-year, hassle-free warranty. We stand by the quality and reliability of our programmed electronics.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. While this module often resolves the root cause that triggers a P0700, it’s essential to check for other specific codes (like P0750-P0758 for solenoids) to confirm the TCM is the issue. In many cases, a new TCM is the correct fix.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part, so you don’t have to worry about the cost or hassle of shipping it back.