If your 2007-2013 GMC Sierra 1500 is suffering from erratic shifting, getting stuck in gear, or has the dreaded check engine light on with transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM trucks and SUVs sidelined by this exact issue. This isn’t just an annoyance; it’s a problem that affects your truck’s reliability, safety, and fuel economy. The solution is a dependable replacement that communicates flawlessly with your vehicle, and this VIN-programmed T42 TCM is engineered to do precisely that.
Case Study: A Tricky Diagnosis
A customer brought in a 2008 Silverado with classic symptoms: harsh 1-2 shifts and intermittent limp mode. He had already replaced two shift solenoids based on a generic P0750-series code, but the problem persisted. After a quick data stream analysis, I noticed the TCM was commanding shifts but the transmission wasn’t responding consistently. The internal logic of the original TCM was failing under load. We installed one of our VIN-programmed T42 modules. The truck immediately started shifting smoothly, and all codes were cleared. It wasn’t a mechanical fault; it was an electronic one—a common scenario this part is designed to fix permanently.
Is Your Sierra Exhibiting These Telltale Signs?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, delayed, or slamming gear changes.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ An illuminated Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0700 (Transmission Control System Malfunction) or various solenoid codes (e.g., P0750, P0751, P0752).
- ✔ Failure to upshift or downshift, leading to poor acceleration and terrible gas mileage.
- ✔ Unexplained loss of communication with the TCM on a scan tool.
The Plug-and-Play Solution for Your 2007-2013 Sierra 1500 TCM
The biggest headache with replacing electronic modules is often the need for expensive dealership programming. We eliminate that step entirely. By providing your vehicle’s VIN at checkout, we program this module with the latest GM software specific to your truck. This ensures it works correctly right out of the box, restoring the precise shift logic and torque converter operation your Sierra’s 4L60E, 4L65E, or 4L70E transmission requires. This isn’t a generic part; it’s a direct-fit, OEM-quality solution for part number 24241806 and other interchangeable numbers.
Your Straightforward 30-Minute Installation Guide
You don’t need to be a master mechanic to install this part. With basic hand tools, you can get your truck back to perfect working order in your own driveway.
- Safety First: Always disconnect the negative terminal from your truck’s battery to prevent electrical shorts and reset the system.
- Locate the Module: On most 2007-2013 Sierra 1500 models, the TCM is conveniently located in the engine bay, right next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. 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 connectors. Ensure they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any lingering fault codes.
Verified Fitment for Your GM Vehicle
This T42 Transmission Control Module is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions. While this page focuses on the 2007-2013 Sierra 1500 TCM, it also fits the following models (please verify location and options):
- ✔ Chevrolet Silverado, Tahoe, Suburban, Avalanche, Express, Colorado
- ✔ GMC Yukon, Savana, Canyon, Envoy
- ✔ Cadillac DTS, Buick LaCrosse, Lucerne
- ✔ Pontiac G6, Grand Prix
- ✔ Hummer H3, Saab 9-7X, and more.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This module is delivered to you fully programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you the time and expense of a dealership visit.
Where is the TCM located on my 2009 Sierra 1500?
On the 2007-2013 GMC Sierra and Chevrolet Silverado pickups, the TCM is typically mounted on a bracket right next to the battery in the engine compartment.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old part or dispose of it without any hassle or need to return it.
What kind of warranty comes with this module?
This part is backed by our comprehensive one-year warranty, giving you peace of mind and confidence in your repair.
Will this fix a P0700 code?
A P0700 code is a general code indicating the TCM has detected a fault. While this module often resolves the root cause (like internal failure), it’s crucial to check for other specific codes (e.g., solenoid or sensor codes) to confirm the diagnosis. In many cases where the TCM itself is faulty, this part is the correct fix.