Is Your 2007 GMC Sierra 2500 Shifting Erratically?
If you’re experiencing harsh shifting, delayed gear engagement, or your truck is stuck in limp mode, a failing Transmission Control Module (TCM) is the most likely cause. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can lead to a host of frustrating and potentially damaging issues, from poor fuel economy to a complete loss of drivability. This genuine GM T42 Transmission Control Module, service part number 24252114, is the definitive solution to restore your truck’s performance and reliability.
From the Diagnostic Bay
We had a 2007 Sierra 2500 HD with the 6.0L towed in last week. The owner said it suddenly started banging into gear and the check engine light was on. It was stuck in 3rd gear (limp mode). A quick scan pulled a P0700 (Transmission Control System Malfunction) and several solenoid circuit codes. Instead of chasing down individual solenoids, we checked the TCM connections first—they were clean. Experience pointed directly to the module itself. We installed one of our VIN-programmed T42 modules. After a 15-minute install and clearing the codes, the truck shifted perfectly on the test drive. The customer saved hundreds by avoiding a dealership visit and unnecessary diagnostic time.
Symptoms of a Failing 2007 Sierra 2500 TCM
- ✔ Harsh or unpredictable shifting between gears.
- ✔ The vehicle gets stuck in a single gear, often referred to as “limp mode.”
- ✔ Illumination of the Check Engine Light or Transmission Warning Light.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are stored.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ The transmission seems to slip or fails to engage gears promptly.
- ✔ Complete failure to shift up or down.
The Plug-and-Play Solution: VIN Programming Included
Don’t settle for a generic module that requires an expensive trip to the dealership for programming. We take the hassle and expense out of the equation. Before shipping, we program this module with your vehicle’s specific Vehicle Identification Number (VIN) and load the latest GM software updates. This ensures that the TCM is perfectly calibrated for your Sierra’s engine, transmission (like the 4L80E), and tire size. The result is a true plug-and-play installation. Simply install the module, connect the wiring, and you’re ready to drive. No additional programming or calibration is required.
This module is a direct replacement for a wide range of GM vehicles from 2006 to 2014 equipped with 4-speed automatic transmissions (4L60E, 4L65E, 4L70E, 4L80E). It is interchangeable with numerous part numbers, including 24234503, 24230461, 24256960, and more, making it a versatile and reliable fix for your transmission woes.
Easy Installation for the DIY Mechanic
Replacing the TCM on your 2007 Sierra 2500 is a straightforward process that can be completed in under 30 minutes with basic hand tools. On this specific model, the TCM is typically located in the engine compartment, right next to the battery.
- Safety First: Always disconnect the negative terminal of your vehicle’s battery before beginning any electrical work.
- Locate the Module: Find the TCM mounted next to the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed module into place and securely reconnect the electrical harnesses.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s always good practice to use a basic OBD2 scan tool to clear any stored transmission codes after installation.
With no core charge required, you can keep your old part without the hassle of returning it. Get back on the road with confidence knowing your transmission is functioning as it should.
Frequently Asked Questions
What is VIN programming and why is it important for a TCM?
VIN programming involves loading your vehicle’s specific factory software and calibrations onto the Transmission Control Module. This is crucial because it ensures the TCM communicates correctly with your truck’s engine and other systems, controlling shift points, line pressure, and torque converter lockup precisely as the manufacturer intended. Without it, the transmission will not function correctly.
Do I need to take my truck to a dealer after installing this module?
No. Because this module comes pre-programmed to your vehicle’s VIN, you do not need to visit a dealership or repair shop for additional programming. It is a true plug-and-play solution, saving you time and money.
Where is the TCM located on a 2007 GMC Sierra 2500?
On the 2007 GMC Sierra 2500 (new body style), the Transmission Control Module is conveniently located in the engine bay, typically mounted in a bracket right next to the battery.
Will this module fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause of a P0700 and related solenoid codes, you should ensure the transmission wiring and solenoids are in good condition. However, a faulty TCM is the most common culprit.
Is there a core charge for my old module?
No, there is no core charge associated with this part. You can keep your old module without any obligation to return it, simplifying the repair process for you.