Get Your GMC Sierra Shifting Like New Again
If you’re dealing with the frustration of a GMC Sierra that slams into gear, refuses to shift, or is stuck in limp mode, you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen countless GMT900 trucks exhibit these exact symptoms. More often than not, the culprit isn’t a catastrophic transmission failure, but a faulty Transmission Control Module (TCM). This VIN-programmed T42 TCM, part number 24252114, is the definitive, hassle-free solution to restore your truck’s performance and reliability.
This isn’t just a replacement part; it’s a direct fix that arrives ready for installation. We handle the complex part by programming the module to your truck’s specific VIN before it ships. This means you can bypass the expensive trip to the dealership for programming. For a DIYer, this saves you time and money. For a professional shop, it means a faster turnaround time for your customer. This module directly controls shift points, torque converter clutch engagement, and line pressure, resolving the root cause of many common transmission issues.
Case Study: The Sierra That Dodged a Transmission Rebuild
A customer brought in his 2011 Sierra 1500, convinced he needed a full transmission rebuild. The truck was shifting harshly from 1st to 2nd and had thrown a P0700 code. He was quoted over $3,000 elsewhere. After a quick diagnostic check, I suspected the TCM. We swapped in one of our pre-programmed modules, and in less than an hour of work, the truck was shifting as smoothly as the day it left the factory. He saved thousands of dollars and a week of downtime. This is a common story, and it highlights how a targeted repair with the right part can be the most effective solution.
Is Your Sierra Exhibiting These Telltale Signs?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Hard, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The truck is stuck in ‘limp mode,’ often in 2nd or 3rd gear, with limited power.
- ✔ Your check engine light or transmission warning light is on, with Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- ✔ A complete failure to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ Intermittent loss of communication with the module or sudden, unpredictable transmission behavior.
DIY Installation: Get Your Truck Shifting Smoothly in Under 30 Minutes
One of the best features of this module is its straightforward installation. You don’t need a vehicle lift or specialized transmission tools. For the 2007-2013 GMC Sierra 1500, the TCM is conveniently located right next to the battery in the engine compartment.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: Open the hood and find the TCM mounted next to the battery. It will have several large electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harnesses. They have locking tabs, so be gentle. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module in place of the old one and securely reconnect the wiring harnesses.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory.
Verified Fitment for Your General Motors Vehicle
While this is the ideal 2007-2013 Sierra 1500 TCM, this versatile T42 module is also a direct-fit replacement for a wide range of GM cars, trucks, and SUVs equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is interchangeable with part numbers 24234503, 24242391, and others listed in our compatibility chart. Please verify your vehicle in the list below:
Fitment includes: GMC Sierra 1500/2500, Yukon, Savana; Chevrolet Silverado 1500/2500, Tahoe, Suburban, Avalanche, Express, Colorado; Cadillac DTS; Hummer H3, and many more. Refer to the detailed fitment list for specifics.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This is the biggest benefit of our service. We program the TCM to your vehicle’s VIN before shipping, so it’s ready for immediate plug-and-play installation.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without the hassle of returning it.
What tools are required for installation on a Sierra 1500?
You’ll only need basic hand tools: a socket or wrench to disconnect the battery terminal and another to unbolt the module from its bracket. An OBD2 scan tool is recommended for clearing codes post-installation.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM. While this module often resolves the underlying issue causing the P0700 (like a solenoid circuit failure within the TCM), you should always diagnose any other accompanying codes (e.g., P0751, P0756) to confirm the TCM is the root cause.
What is the warranty on this part?
This transmission control module comes with a one-year warranty, giving you confidence and peace of mind in your repair.