Restore Your Van’s Transmission Performance
If your 2006-2014 GMC Savana 2500 is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, a failing Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline a reliable work van. This T42 TCM, part number 24240449, is the definitive solution. It arrives expertly pre-programmed to your van’s specific Vehicle Identification Number (VIN), eliminating the need for expensive dealership programming. This makes it a true plug-and-play fix that restores the precise, smooth shifting your 4L80E transmission was designed for.
From the Diagnostic Bay
Case Study: The Intermittent Savana
A local contractor brought in his ’11 Savana 2500 with a frustrating problem. He said it would occasionally slam into gear, but by the time he got to the shop, it would behave perfectly. He had no check engine light on. After a test drive, I noticed a slight hesitation between the 2-3 shift. Hooking up my professional scan tool, I monitored the solenoid command data. Sure enough, I saw intermittent dropouts from the TCM. These T42 modules can develop internal connection issues from years of heat cycles and vibration. We installed a VIN-programmed module, and the van was shifting like new. This is a classic failure mode for the 2006-2014 Savana 2500 TCM, and a new programmed unit is the most reliable fix.
Common Signs of a Failing T42 TCM
Don’t let a bad module leave you stranded. If your vehicle is showing these symptoms, it’s time for a replacement:
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ The check engine light or transmission warning light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Poor fuel economy and a feeling of lost power.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
For the GMC Savana and Chevrolet Express vans, this is a job most DIYers or any professional can complete in under 30 minutes. No special tools are required.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Module: On your Savana 2500, the TCM is located in the engine compartment on the right-hand (passenger) side, typically near the firewall or inner fender.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. 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 in.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any stored DTCs. Take the vehicle for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions (like the 4L60E, 4L65E, 4L70E, and 4L80E). While this is the correct part for the 2006-2014 Savana 2500 TCM, it also fits many other models. Please verify your part number or contact us with your VIN to ensure perfect fitment. Compatible part numbers include: 24252114, 24234503, 24230461, 24234274, 24235340, 24240449, and more.
Frequently Asked Questions
Do I need to do any programming myself?
No. This module comes fully programmed to your vehicle’s VIN. It is ready for installation right out of the box, with no need for a trip to the dealership or a special scan tool for programming.
What is a T42 TCM?
The T42 is the GM platform name for this specific generation of Transmission Control Module. It acts as the brain for the automatic transmission, controlling all shift points, line pressure, and torque converter lockup functions.
Is there a core charge for my old part?
No, we do not require you to send back your old module. There is no core charge, saving you time and return shipping costs.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the Engine Control Module (ECM) to turn on the check engine light. While this module often resolves the underlying issue causing the P0700, you should scan for more specific transmission codes (like P07xx) to confirm the diagnosis.
Where is this module located on my 2012 Savana 2500?
On the 2006-2014 Savana and Express vans, the TCM is consistently found in the engine compartment on the right-hand (passenger) side of the vehicle.