If your 2007 GMC Sierra 2500 is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’re likely dealing with a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline a perfectly good work truck. This isn’t just an annoyance; it’s a reliability issue that affects your truck’s performance and safety. This T42 TCM, part number 24235732, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play repair.
From the Diagnostic Bay
I remember a customer bringing in his ’07 Sierra 2500 with the 6.0L. The complaint was intermittent—sometimes it would shift hard from 1st to 2nd, and other times it would refuse to shift out of 3rd gear after getting hot on the highway. He’d already replaced a shift solenoid with no luck. After hooking up my scan tool, I saw no communication with the TCM. We traced the wiring and found it was solid. The culprit was the TCM itself, suffering from internal heat-related failure. Installing a VIN-programmed module like this one had him back on the road in under an hour, with shifting performance that felt like new. It’s a common story for these reliable but hard-working trucks.
Is Your Sierra HD Showing These Transmission Problems?
A failing TCM doesn’t heal itself; it only gets worse. Ignoring the signs can lead to more significant transmission damage. Here’s what to look for:
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ The truck is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700 (Transmission Control System Malfunction) or solenoid-specific codes (P0750, P0751, etc.).
- ✔ Inability to upshift or downshift properly.
- ✔ A sudden drop in fuel economy.
- ✔ Complete loss of communication with the module.
Your Direct-Fit, No-Hassle Solution
The biggest headache with replacing a modern electronic module is the required programming. This 2007 Sierra 2500 TCM eliminates that step entirely. We handle the complex part for you. By programming the module to your vehicle’s VIN before it ships, we ensure it communicates seamlessly with your truck’s Engine Control Module (ECM) and other systems right out of the box. This saves you a costly trip to the dealership and hours of diagnostic frustration.
A Straightforward Guide to Installation
You don’t need a professional lift or complex equipment for this job. For the 2007 Sierra 2500, the TCM is conveniently located right next to the battery in the engine compartment. The entire process should take less than 30 minutes.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: Open the hood and find the TCM mounted next to the battery tray.
- Disconnect and Remove: Carefully unclip the electrical connectors. Be gentle with the locking tabs, as they can become brittle over time. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new module in place and securely reconnect the electrical harnesses. You’ll hear a ‘click’ when they are properly seated.
- Final Steps: Reconnect the negative battery terminal. Start the truck and allow it to idle for a few minutes. While not always necessary, using a basic OBD-II scan tool to clear any stored fault codes is a good final step.
Verified Vehicle Compatibility
While this is the correct module for your 2007 Sierra 2500 TCM replacement, it also serves as a direct-fit part for a wide range of other GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. This part is interchangeable with service numbers 24242391, 24234503, 24252114, and more. Some popular compatible models include:
- ✔ Chevrolet Silverado, Tahoe, Suburban, Express Van
- ✔ GMC Yukon, Savana Van
- ✔ Cadillac DTS, Hummer H3
- ✔ Chevrolet Impala, Cobalt, HHR
- ✔ Pontiac G6, Grand Prix
Always confirm fitment for your specific vehicle before ordering.
Frequently Asked Questions
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This Transmission Control Module comes fully pre-programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you time and money.
Where is the TCM located on my 2007 Sierra 2500?
On the 2007 GMC Sierra 2500 (new body style), the TCM is located in the engine compartment, typically mounted on a bracket right next to the battery.
Will this fix a P0700 trouble code?
A P0700 code indicates a general fault request from the TCM. If the TCM itself is the source of the failure, replacing it with this module will resolve the code. However, you should always ensure other potential issues (like wiring or solenoids) have been ruled out.
What tools are required for installation?
Basic hand tools are all that’s needed. Typically, a simple socket set (e.g., 10mm socket) to unbolt the module bracket and a wrench to disconnect the battery terminal will be sufficient.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of returning it.