Restore Peak Transmission Performance in Your GM Vehicle
Is your 2007 GMC Sierra 2500, or another compatible GM vehicle, suffering from erratic shifting, delayed gear engagement, or a frustrating check engine light? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and monitoring system health. When it fails, it can lead to poor performance, decreased fuel economy, and even leave you stranded in limp mode. This genuine quality T42 TCM, service part number 24238856, is the definitive solution to restore the smooth, reliable operation you expect from your truck or SUV.
From the Diagnostic Bay
We had a customer bring in a 2008 Silverado with classic transmission trouble: harsh 1-2 shifts and occasionally getting stuck in 3rd gear. He had already spent a fair amount of money replacing shift solenoids, thinking that was the obvious fix. When the problem persisted, he came to us. A quick scan showed a P0752 code (Shift Solenoid A Stuck On), but our diagnostic flowchart pointed towards the module itself. After confirming power and ground were good at the TCM connector, we installed one of our VIN-programmed T42 modules. The truck immediately started shifting perfectly. The original solenoids were likely fine; the old TCM was just sending faulty commands. This is a common scenario where addressing the root cause—the module—saves time, money, and headaches.
Symptoms of a Failing T42 TCM
A faulty TCM can manifest in various ways, often mimicking mechanical transmission problems. If you’re experiencing any of the following issues, your transmission control module is the most likely culprit:
- ✔ Harsh, erratic, or delayed gear shifts that disrupt your driving experience.
- ✔ The vehicle enters “limp mode,” often getting stuck in a single gear (usually 2nd or 3rd) to prevent further damage.
- ✔ Your dashboard illuminates with a Check Engine Light or a dedicated transmission warning light.
- ✔ Diagnostic trouble codes (DTCs) are stored, such as the general P0700 code or specific solenoid-related codes (e.g., P0750, P0751, P0753).
- ✔ The transmission refuses to upshift or downshift correctly, leading to high RPMs or sluggish acceleration.
- ✔ A noticeable drop in fuel efficiency as the transmission operates outside its optimal parameters.
- ✔ In severe cases, a complete loss of communication with the module, resulting in total transmission failure.
Why Choose Our Programmed 2007 Sierra 2500 TCM?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The single biggest challenge when replacing a modern TCM is the need for expensive and time-consuming dealership programming. We eliminate that step entirely. By providing us with your vehicle’s VIN during checkout, we program the module with the latest GM software updates specific to your truck. This ensures perfect communication between the engine, transmission, and other vehicle systems right out of the box.
Key Benefits:
- Plug-and-Play Installation: With our complimentary VIN programming, this module is ready for immediate installation. No need for a trip to the dealer or a specialized scan tool for setup.
- OEM-Standard Quality: Built to meet or exceed original equipment specifications, this module ensures long-lasting durability and reliable performance for years to come.
- Cost-Effective Repair: Avoid the high costs of dealership parts and labor. This is a straightforward DIY-friendly repair that can be completed in under an hour with basic hand tools.
- No Core Charge: Unlike many suppliers, we do not require you to return your old, faulty module. This saves you the hassle and expense of core returns.
This T42 TCM is a direct replacement for a wide array of service numbers, including 24252114, 24234503, 24230461, 24238856, and more, making it a versatile solution for many popular GM models from 2006-2014 equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E.
Frequently Asked Questions
What exactly is VIN programming?
VIN programming involves loading the module with the specific software and calibration files that match your vehicle’s unique Vehicle Identification Number (VIN). This ensures the TCM communicates correctly with your engine and other systems, controlling shift points, line pressure, and torque converter lockup exactly as the manufacturer intended.
Do I need to take this part to a dealer after installation?
No. Because we pre-program the module to your VIN, no further dealership programming or setup is required. It is a true plug-and-play solution. We do recommend clearing any old diagnostic trouble codes with a standard code reader after installation.
Where is the TCM located on my 2007 Sierra 2500?
On the 2007 GMT900 platform trucks like the Sierra and Silverado, the T42 TCM is typically located in the engine compartment, mounted next to the battery. Always disconnect the battery’s negative terminal before beginning the replacement process.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating that the TCM has detected a problem and has requested the check engine light to be turned on. While the P0700 itself doesn’t pinpoint the failure, it is very commonly triggered by an internal TCM fault. Replacing a faulty TCM will resolve the underlying issue that caused the P0700 code.
What is the warranty on this transmission control module?
This module comes with a comprehensive one-year warranty, giving you peace of mind and confidence in your purchase. We stand behind the quality and reliability of our programmed electronic components.