Is your 2007 GMC Sierra 2500 HD fighting you on every shift? Experiencing harsh gear changes, getting stuck in limp mode, or seeing that dreaded check engine light? As a technician with over two decades of experience, I’ve seen these symptoms countless times. The culprit is often a failing Transmission Control Module (TCM), the electronic brain that orchestrates your transmission’s every move. When it falters, your truck’s reliability and performance suffer dramatically.
This isn’t just an inconvenience; it’s a critical failure that can leave you stranded. We offer a direct-fit, dependable solution: a high-quality T42 Transmission Control Module, pre-programmed specifically to your truck’s Vehicle Identification Number (VIN). This means you can skip the expensive and time-consuming trip to the dealership for programming. This is a true plug-and-play fix designed to restore the smooth, predictable shifting you depend on, whether you’re hauling a heavy load or just driving to work.
A Technician’s Notebook
I remember a contractor who brought his ’07 Sierra 2500 into my shop. The truck was stuck in third gear, and he was losing money every day it was down. His scanner showed a generic P0700 transmission fault code. After checking the basics, we pinpointed the TCM. The dealership quoted him a hefty price and a two-day wait for programming. Instead, we used one of our VIN-programmed modules. In less than an hour, the truck was shifting perfectly, the codes were cleared, and he was back on his way to the job site. That’s the power of having a ready-to-install, correctly programmed part.
Diagnosing a Faulty 2007 Sierra 2500 TCM
A failing TCM can manifest in several ways, often starting intermittently before becoming a constant problem. If your truck is showing these signs, the TCM is a likely suspect. Over my years in diagnostics, these are the most common indicators I’ve seen associated with T42 module failure:
- ✔ Harsh, slamming, or erratic shifting between gears.
- ✔ The vehicle gets stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are stored, such as P0700, P0750-series (solenoid faults), or U-series communication codes.
- ✔ Delayed engagement when shifting from Park into Drive or Reverse.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ Complete loss of communication with the transmission, leading to a no-shift condition.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation. For most DIYers or professional mechanics, this is a job that can be completed in under 30 minutes with basic hand tools. On the 2007 Sierra 2500, the TCM is typically located in the engine bay, right next to the battery.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electronic component replacement. This prevents electrical shorts and helps reset the vehicle’s systems.
- Locate the Module: Find the TCM mounted near the battery in the engine compartment. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note their orientation. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Securely reconnect the electrical connectors, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always best practice to use a scan tool to clear any lingering fault codes from the vehicle’s memory. Start the engine and test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24241806 and is compatible with a wide range of General Motors vehicles equipped with 4-speed automatic transmissions (like the 4L60E, 4L65E, 4L70E, and 4L80E). While this page focuses on the 2007 Sierra 2500 TCM, please see the comprehensive list below to verify fitment for other models.
This part will fit these makes and models with these options:
- SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
- SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
- SAVANA & EXPRESS VANS (2500/3500) 06-14 Transmission; (RH engine compartment)
- TAHOE & YUKON 07-09 Transmission; (next to battery)
- SILVERADO & SIERRA 1500 PICKUP 07-13 Transmission; (next to battery)
- COLORADO & CANYON 08-12 Transmission; (RH rear engine compartment)
- HUMMER H3 08-10 Transmission; (RH rear engine compartment)
- And many more GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to take my truck to the dealer after installing this?
No. This module comes fully programmed to your vehicle’s VIN. It is designed for direct installation without requiring any additional programming or flashing from a dealership, saving you time and money.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) at checkout. This ensures we can load the correct factory software and calibrations for your specific truck.
Is this part number 24241806 interchangeable with other numbers?
Yes, this T42 TCM is a direct replacement for many part numbers, including 24252114, 24234503, 24242391, and others. It covers a wide range of applications.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request, meaning the TCM has detected a problem and asked the main computer to turn on the check engine light. If the root cause is a failing TCM, replacing it will resolve the P0700 and any related transmission-specific codes.
Do I need to send my old TCM back (core charge)?
No, there is no core charge for this part. You can keep your old module without any hassle or extra fees.