Restore Your Truck’s Transmission Performance
If you’re dealing with the frustration of a transmission that won’t shift correctly, you’re not alone. As a technician with over two decades of experience, I’ve seen countless heavy-duty trucks like the 2007 Silverado 2500 sidelined by a faulty Transmission Control Module (TCM). Symptoms like harsh gear changes, getting stuck in limp mode, or a persistent check engine light can make your reliable workhorse feel unpredictable. This isn’t just an annoyance; it affects your truck’s towing capability, fuel economy, and overall safety.
This T42 Transmission Control Module is the definitive solution. It arrives at your door fully pre-programmed to your truck’s specific Vehicle Identification Number (VIN). This means you can skip the expensive trip to the dealership for programming. It’s a direct, plug-and-play fix designed to restore the precise, smooth shifting your Silverado 2500 had from the factory. Whether you’re a professional mechanic looking for a reliable part for a customer’s truck or a DIYer tackling the job in your own garage, this module eliminates guesswork and gets you back on the road with confidence.
From the Diagnostic Bay
I remember a 2007 Silverado 2500 with the 6.0L that came into my shop. The owner was frustrated because it would randomly slam into gear and occasionally get stuck in what felt like 3rd gear. He’d already replaced a shift solenoid with no luck. A quick scan showed a P0700 (Transmission Control System Malfunction) and an intermittent solenoid circuit code. Experience pointed me straight to the TCM. Instead of a costly diagnostic rabbit hole, we installed a VIN-programmed module like this one. In under 30 minutes, the truck was shifting perfectly. The pre-programming was key—it saved the customer a day of downtime and the extra cost of dealership service.
Diagnosing a Failing 2007 Silverado 2500 TCM
A failing TCM can mimic other transmission problems, but there are key indicators. This module is the likely culprit if your truck is experiencing several of the following issues. Recognizing them early can prevent further damage to your transmission.
- âś” Unpredictable or harsh shifting between gears.
- âś” The transmission feels like it’s slipping or hesitating to engage.
- âś” Your truck is stuck in “limp mode” and won’t shift out of a single gear.
- âś” The Check Engine Light is on with transmission-specific Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- âś” A noticeable drop in fuel efficiency.
- âś” No communication with the TCM when using a scan tool.
A Straightforward Guide to Installation
One of the best features of this module is its simple installation. You don’t need specialized tools, and the job can typically be completed in your driveway in under 30 minutes. For the 2007 Silverado 2500, the TCM is conveniently located in the engine bay.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and help reset the system.
- Locate the TCM: On your Silverado, find the module located next to the battery in the engine compartment.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical connectors, ensuring they click securely into position.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the truck and enjoy smooth shifting!
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24239926 and other interchangeable numbers. It is engineered for a wide range of GM vehicles, ensuring OEM-level function. While this page focuses on the Silverado, it also fits the following models (please verify location and options):
- Chevrolet Silverado 2500 Pickup (2007): New style (smooth door skin), 6.0L, (next to battery)
- Chevrolet Silverado 1500 Pickup (2007-2013)
- GMC Sierra 1500/2500 Pickup (2007-2013)
- Chevrolet Tahoe / Suburban (2007-2009)
- GMC Yukon / Yukon XL (2007-2009)
- Chevrolet Express / GMC Savana Vans (2006-2014)
- Cadillac DTS (2006-2011)
- Hummer H3 (2008-2010)
- …and many other GM cars, trucks, and SUVs from 2006-2014.
Do I need to take my truck to the dealer after installing this?
Do I need to take my truck to the dealer after installing this?
No. This is the biggest benefit. We program the module to your vehicle’s VIN before shipping it. This ensures it’s ready for immediate installation and operation without requiring any additional, expensive programming from a dealership.
What is a T42 TCM?
The T42 is the specific hardware platform name for this generation of General Motors Transmission Control Module. It was used across a vast range of vehicles with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E.
Is this part difficult to install for a DIYer?
Not at all. For the 2007 Silverado 2500, the TCM is located right next to the battery, making it one of the easier modules to access and replace. With basic hand tools, the swap takes less than half an hour.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the problem is the TCM itself. Replacing a faulty TCM is a very common and effective way to resolve a P0700 code and related specific codes (like for solenoids).
Do I need to send my old part back?
No. There is no core charge for this part. You can keep or dispose of your old module without the hassle of returning it.