Is Your 2007 Sierra 2500 Plagued by Transmission Problems?
If your GMC Sierra 2500 is experiencing erratic shifting, getting stuck in gear, or displaying a check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for every gear change, torque converter lockup, and pressure regulation. When it fails, it can cause a cascade of frustrating and potentially damaging issues, turning your reliable truck into an unpredictable machine. This genuine quality T42 TCM, part number 24255280, is the definitive solution to restore your truck’s factory performance and drivability.
From the Diagnostic Bay
We had a 2007 Sierra 2500 come into the shop with a classic complaint: intermittent harsh shifting and occasionally getting stuck in 3rd gear, also known as “limp mode.” The owner had already replaced a couple of shift solenoids with no luck. Diagnostic Trouble Code (DTC) P0700 was present, which is a general transmission fault code. After running a full diagnostic, we noticed the TCM was intermittently losing communication with the powertrain control module. Instead of a costly and uncertain repair at the dealership, we installed one of our VIN-programmed T42 modules. The installation took less than 30 minutes, and after clearing the codes, the truck was shifting as smoothly as it did the day it left the factory. The customer was back on the road, problem solved without the dealership hassle.
Symptoms of a Failing GM T42 TCM
A faulty TCM can manifest in various ways. If you’re noticing any of the following signs, it’s time to inspect your transmission module. Ignoring these symptoms can lead to more severe transmission damage down the line.
- ✔ Harsh, erratic, or delayed gear shifts.
- ✔ Vehicle stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes are stored.
- ✔ Failure to upshift or downshift correctly.
- ✔ Noticeable decrease in fuel economy.
- ✔ Inability to engage gears or a long delay when shifting from Park to Drive or Reverse.
- ✔ Complete loss of transmission function in severe cases.
The Direct-Fit Solution: Your Pre-Programmed 2007 Sierra 2500 TCM
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership for calibration. Our T42 Transmission Control Module arrives at your door fully programmed to your truck’s specific Vehicle Identification Number (VIN). This critical step ensures that the module communicates flawlessly with your vehicle’s other systems, using the latest GM software updates for optimal shift points, fuel efficiency, and long-term reliability. This is a true plug-and-play repair.
Built to strict OEM specifications, this module is a direct replacement for service numbers 24252114, 24234503, 24230461, and many others. It is engineered to control the 4-speed automatic transmissions (4L60E, 4L65E, 4L70E, 4L80E) found in a wide range of 2006-2014 GM vehicles, including the Chevrolet Silverado, Tahoe, GMC Yukon, and Cadillac DTS. By providing a stable and precise command center for your transmission, this module not only resolves existing issues but also helps prevent future shifting problems and excessive wear on internal components.
Simple Installation, Lasting Results
Replacing the 2007 Sierra 2500 TCM is a straightforward process that can be completed with basic hand tools. On the ’07 Sierra new body style, the module is conveniently located next to the battery in the engine compartment. Simply disconnect the vehicle’s battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. We recommend using a basic scan tool to clear any stored DTCs after installation to ensure a clean slate for the new module. Best of all, there is no core charge, so you can keep your old part without the hassle of shipping it back.
Frequently Asked Questions
Does this TCM require any programming at the dealership?
No. This module is delivered to you pre-programmed to your vehicle’s VIN. It is a plug-and-play solution that does not require any additional flashing or calibration from a dealer.
Where is the TCM located on my 2007 GMC Sierra 2500?
For the 2007 new style (smooth door skin) Sierra 2500, the Transmission Control Module is typically located in the engine compartment, right next to the battery.
Will this part fix my truck being stuck in ‘limp mode’?
Yes, being stuck in one gear (usually 2nd or 3rd) is one of the most common symptoms of a failed TCM. Replacing the faulty module with this pre-programmed unit is the correct fix for this issue.
What are some common trouble codes for a bad TCM?
A failing TCM will often trigger a general transmission fault code like P0700, which then points to more specific codes related to shift solenoids (e.g., P0751, P0756), pressure control solenoids, or communication errors.
Is there a core charge for this part?
No, there is no core charge. You are not required to return your old, non-functional module, saving you time and money.
What kind of warranty is included?
This Transmission Control Module is backed by our one-year warranty, giving you peace of mind and confidence in your repair.