Fix Your Truck’s Shifting Problems for Good
As a technician with over two decades of experience, I’ve seen countless GMC and Chevy trucks roll into the shop with frustrating transmission issues—harsh bangs into gear, getting stuck in limp mode, or just refusing to shift correctly. More often than not, the culprit is a failing Transmission Control Module (TCM). This VIN-programmed T42 TCM, part number 24230461, is the direct, reliable solution for your 2007-2013 GMC Sierra 1500. It’s the transmission’s brain, and when it falters, your truck’s performance and dependability go with it. This replacement module arrives ready to install, pre-loaded with your truck’s specific software, saving you a costly trip to the dealership for programming.
From the Diagnostic Bay: The Case of the ‘Limp Mode’ Sierra
A customer brought in his 2011 Sierra 1500, complaining it was stuck in what felt like third gear and the check engine light was on. His local shop had replaced two shift solenoids, but the problem persisted. I hooked up my scanner and pulled a P0700 (Transmission Control System Malfunction). Digging deeper, I saw intermittent communication loss with the TCM. These T42 modules, especially on work trucks, are subjected to constant heat cycles and vibration. The internal circuit boards can develop micro-fractures, leading to the exact symptoms he described. We installed one of our VIN-programmed TCMs, cleared the codes, and the truck was shifting perfectly on the test drive. He saved hundreds by avoiding a dealership diagnosis and programming fee.
Is Your Sierra Exhibiting These Common TCM Failure Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, there’s a strong chance your module is the problem. A proper diagnosis is key, but these are the tell-tale symptoms I see daily.
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable and unpredictable.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”) to protect the transmission from further damage.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758 (solenoid circuit faults), or U0101 (Lost Communication with TCM).
- ✔ A noticeable decrease in fuel economy as the transmission isn’t operating at peak efficiency.
- ✔ The transmission seems to slip out of gear or fails to engage properly from a stop.
DIY Installation Guide: Get Your Sierra Shifting Smoothly in 30 Minutes
One of the best features of this module is its straightforward installation. You don’t need a lift or specialized shop equipment. For a 2007-2013 Sierra 1500, the TCM is typically located right next to the battery in the engine compartment, making it easily accessible.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the TCM: Open the hood and find the module next to the battery tray. It’s a silver box with several large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harnesses. They have locking tabs, so be gentle. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring they click and lock into position.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s always a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the ECU. Start the truck and enjoy smooth shifting!
Verified Compatibility for Your GM Vehicle
This T42 TCM is a direct fit for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page focuses on the 2007-2013 Sierra 1500 TCM, it also fits many other models. Please verify your vehicle in the list below. This part is interchangeable with service numbers 24252114, 24234503, 24230461, and others.
- ✔ GMC Sierra 1500 / 2500: 2007-2013
- ✔ Chevrolet Silverado 1500 / 2500: 2007-2013
- ✔ Chevrolet Tahoe / Suburban / Avalanche: 2007-2009
- ✔ GMC Yukon / Yukon XL: 2007-2009
- ✔ Chevrolet Express / GMC Savana Vans: 2006-2014
- ✔ Hummer H3: 2008-2010
- ✔ Chevrolet Colorado / GMC Canyon: 2008-2012
- ✔ And many more GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Why is VIN programming so important?
VIN programming loads your vehicle’s specific software and calibrations onto the module before it ships. This ensures the TCM communicates perfectly with your engine computer (ECU) and other systems, controlling shift points and torque converter lockup exactly as the factory intended. It makes the installation truly plug-and-play, eliminating the need for expensive dealer tools.
Do I need to send my old TCM back?
No, there is no core charge for this part. You can keep your old module or dispose of it, saving you the time and hassle of a return shipment.
What if I install this and still have problems?
While this TCM resolves the most common transmission electronic faults, shifting problems can also be caused by internal mechanical issues (like worn clutches or a bad valve body) or faulty wiring. This part is backed by a one-year warranty. If you’ve confirmed the module is the issue, this part is the fix. If problems persist, a deeper mechanical inspection of the transmission may be needed.
Is this an OEM part?
This is a high-quality replacement part built to meet or exceed original equipment manufacturer (OEM) specifications for performance and reliability. It is designed to be a direct-fit, dependable solution for the original GM part.
How do I provide my VIN?
During the checkout process, you will be prompted to enter your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians use this to program the module specifically for your truck before shipping.