Restore Peak Transmission Performance to Your 2006-2014 GMC Savana 2500
Is your GMC Savana 2500 van experiencing harsh shifting, getting stuck in gear, or showing a 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 leave your work van unreliable and unsafe. This genuine OEM-quality T42 TCM, service part number 24243921, is the definitive solution to restore your vehicle’s smooth, predictable operation.
From the Diagnostic Bay
We had a 2011 Savana 2500 from a local plumbing company come into the shop. The driver complained of sudden, violent shifts and the van being stuck in what felt like third gear (limp mode). The check engine light was on, and our scan tool pulled a P0700 (Transmission Control System Malfunction) and several solenoid-specific codes. After confirming the wiring harness was intact, we identified the original TCM as the culprit. Instead of a costly trip to the dealership for a new module and programming, the owner opted for one of our pre-programmed T42 modules. The installation took less than 30 minutes in their own lot. After clearing the codes, the van shifted perfectly, getting their business back on the road the same day.
The Importance of a Programmed Savana 2500 TCM
Modern vehicles like your Savana 2500 require components that are electronically matched to the specific vehicle they are installed in. This T42 module isn’t just a generic part; it comes expertly programmed to your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures that the module communicates flawlessly with your van’s Engine Control Module (ECM) and other systems. It loads the correct shift points, pressure control parameters, and diagnostic strategies for your specific powertrain configuration (like the 4L80E). This means no expensive post-installation programming is needed—it is a true plug-and-play repair.
Common Symptoms of a Failing Transmission Control Module
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle enters “limp mode,” often getting stuck in 2nd or 3rd gear to prevent further damage.
- ✔ An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other transmission-related solenoid faults.
- ✔ A complete failure to shift up or down, leading to poor acceleration and terrible fuel economy.
- ✔ In some cases, a no-start condition or intermittent communication loss with the scan tool.
Simple Installation and Guaranteed Compatibility
Replacing the TCM on your Savana 2500 is a straightforward process. It is typically located in the engine compartment on the right-hand side, making it easily accessible. Simply disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Once connected and the battery is reconnected, the vehicle is ready to go. This module is a direct replacement for a wide range of GM part numbers, including 24252114, 24234503, and 24243921, ensuring a perfect fit for your van and many other GM trucks, vans, and SUVs from the 2006-2014 era. With a one-year warranty and no core charge, you can complete your repair with confidence and convenience.
Frequently Asked Questions
What does a T42 TCM do in my Savana van?
The T42 Transmission Control Module (TCM) acts as the computer for your automatic transmission. It receives data from various sensors (like vehicle speed and engine RPM) and uses this information to control shift solenoids and hydraulic pressure, ensuring smooth and efficient gear changes.
Is this part difficult to install myself?
For most individuals with basic mechanical skills, the installation is quite simple. The module is located in the engine bay and is held in place by a few bolts. The primary steps are disconnecting the battery, swapping the modules, and reconnecting the battery. It typically takes less than 30 minutes.
What does “VIN Programmed” mean for my Savana 2500?
VIN programming means we load the module with the specific software and calibration files from GM that match your van’s exact build. This ensures it works correctly with your engine, transmission, and other systems right out of the box, eliminating the need for a trip to the dealership for expensive programming.
Will this module 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 be turned on. While a faulty TCM itself can cause this code, it often appears alongside more specific codes (like for a shift solenoid). If the TCM is the root cause of these other codes, then replacing it will resolve the P0700 fault.
Do I need to send my old TCM back?
No, there is no core charge for this part. You can keep, recycle, or dispose of your old module without any hassle or additional fees.