Restore Peak Performance to Your GMC Savana 2500
Is your 2006-2014 GMC Savana 2500 experiencing frustrating and unpredictable shifting issues? A faulty Transmission Control Module (TCM) is often the culprit behind problems like harsh gear changes, getting stuck in limp mode, or the dreaded check engine light. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift with precision. When it fails, it can disrupt your vehicle’s performance, reliability, and fuel economy. This genuine quality T42 TCM, service part number 24243901, is the definitive solution to restore your van’s smooth and dependable operation.
One of the biggest hurdles in replacing a modern vehicle module is the need for expensive and time-consuming dealership programming. We eliminate that step entirely. Each module is expertly programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures that it communicates flawlessly with your van’s other electronic systems, like the Engine Control Module (ECM), right out of the box. This plug-and-play convenience means you or your mechanic can perform the installation without specialized dealer tools, saving you significant time and money.
We had a commercial client bring in their 2011 Savana 2500 work van. The driver complained of intermittent, violent shifts from first to second gear, but only after the van had been running for over an hour. No check engine light was on, making it a diagnostic challenge. After ruling out fluid issues and mechanical faults, we hooked up a high-end scanner to monitor live data. We noticed the TCM was commanding erratic line pressure spikes when hot. The internal electronics were failing under thermal stress. We installed one of our VIN-programmed T42 modules, and the problem was solved instantly. The client was back on the road the same day, avoiding costly downtime for their business.
Diagnosing a Failing Savana 2500 Transmission Module
A failing TCM can manifest in various ways, often mimicking mechanical transmission problems. Recognizing these electronic symptoms is key to a correct diagnosis. If your Savana 2500 is exhibiting any of the following behaviors, your TCM is the most likely cause.
- ✔ Erratic and Harsh Shifting: Experiencing sudden, jerky shifts, banging into gear, or a noticeable delay when the transmission changes gears.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (typically 2nd or 3rd) to prevent further damage. This is a classic sign of TCM failure.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): A scan tool reveals codes such as P0700 (Transmission Control System Malfunction), or specific solenoid codes like P0751, P0756, etc.
- ✔ Poor Fuel Economy: Inefficient shifting and incorrect torque converter lockup caused by a faulty module can lead to a significant drop in MPG.
- ✔ No Communication: In some cases, a scan tool may be unable to communicate with the TCM at all, indicating a complete internal failure.
Plug-and-Play Installation
Replacing the TCM on your Savana 2500 is a straightforward process. For this specific model range, the module is conveniently located in the engine compartment on the right-hand (passenger) side. The process typically takes less than 30 minutes.
- Safety First: Always disconnect the negative terminal of your vehicle’s battery before beginning any electronic component replacement.
- Locate the Module: Open the hood and find the TCM on the RH side of the engine bay.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs, as they can become brittle over time. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock.
- Reconnect Battery: Reattach the negative battery terminal.
- Clear Codes: While the module is programmed, it’s best practice to use a standard OBD2 scan tool to clear any stored DTCs from the vehicle’s memory to ensure a clean start.
This module is a direct replacement for a wide array of GM vehicles utilizing the 4-speed automatic transmissions (4L60E, 4L65E, 4L70E). It interchanges with numerous part numbers, including 24252114, 24234503, 24230461, and 24243901, ensuring broad compatibility and a perfect fit for your repair needs.
Frequently Asked Questions
What is a T42 TCM and what does it do?
The T42 is a specific generation of Transmission Control Module used by General Motors. It acts as the computer for your automatic transmission, processing data from vehicle speed sensors, engine load, and driver input to control shift points, hydraulic pressure, and torque converter lockup for optimal performance and efficiency.
Is this module truly plug-and-play?
Yes. By providing your vehicle’s VIN during checkout, we program the module with the latest GM software specific to your Savana 2500. This ensures it works correctly upon installation without requiring any additional programming from a dealership.
Where is the TCM located on my 2006-2014 Savana 2500?
On the GMC Savana 2500 and its counterpart, the Chevrolet Express 2500, the Transmission Control Module is located in the engine compartment on the right-hand (passenger) side.
Will this fix my P0700 transmission code?
A P0700 code is a general fault code indicating the TCM has detected a problem and has requested the check engine light to be turned on. While this module often resolves the root cause that triggers a P0700, it’s essential to scan for other, more specific transmission codes (like solenoid or sensor codes) to confirm the TCM is the source of the issue.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep or dispose of your old module without the hassle of returning it, making the repair process simpler and more convenient.