Is Your 2006-2014 Savana 3500 Shifting Erratically?
If your GMC Savana 3500 is experiencing harsh shifting, delayed gear engagement, or has a check engine light with transmission codes, a failing Transmission Control Module (TCM) is the likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift with precision. When it fails, it can lead to poor performance, decreased fuel economy, and even leave you stranded in limp mode. This genuine GM T42 TCM, part number 24255280, is the definitive solution to restore your van’s factory performance and reliability.
From the Diagnostic Bay
We recently had a 2011 Savana 3500 work van come into the shop with classic symptoms of a bad transmission. The owner had already spent a significant amount of money replacing shift solenoids, believing they were the issue based on the trouble codes. However, the harsh 1-2 shift and intermittent limp mode persisted. After a quick diagnostic, we identified the root cause: the original T42 TCM was failing electronically. Instead of another costly internal repair, we installed one of our VIN-programmed modules. The van was shifting perfectly within 30 minutes, saving the owner from further guesswork and unnecessary expenses. This highlights how a faulty module can mimic internal transmission problems, making a correct diagnosis crucial.
Symptoms of a Failing GM T42 TCM
- ✔ Harsh, slamming, or delayed gear changes.
- ✔ Vehicle getting stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related codes are stored.
- ✔ Inability to upshift or downshift properly.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ The torque converter failing to lock up at highway speeds.
The Right Fix: A Programmed Savana 3500 Transmission Module
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership for calibration. Our T42 TCMs are expertly programmed to your vehicle’s specific Vehicle Identification Number (VIN) before they ship. This critical step ensures that the module communicates flawlessly with your van’s engine computer and other systems, using the latest GM software updates. The result is a true plug-and-play installation that restores optimal shift points, torque converter strategy, and overall transmission function right out of the box.
Built to strict OEM standards, this module is a direct replacement for service numbers 24242391, 24234503, 24252114, and many others. It’s the ideal component for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E. While perfect for your Savana 3500, it also fits models like the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, and Express vans.
Installation is Simple
This module is designed for a straightforward installation. On most Savana and Express vans, the TCM is located in the engine compartment on the right-hand (passenger) side. The process typically takes less than 30 minutes. Simply disconnect the vehicle’s battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Once the new module is connected and the battery is reconnected, the vehicle is ready to go. We recommend using a scan tool to clear any old codes after installation for a clean slate.
Frequently Asked Questions
What is VIN programming and why is it important?
VIN programming loads your vehicle’s specific software and calibration files onto the module before it is shipped. This ensures the TCM works perfectly with your van’s engine, options, and tire size, providing correct shift patterns and performance without needing a dealership visit.
Is this part difficult to install myself?
No, this is a very DIY-friendly repair. The module is typically easy to access in the engine bay. Basic hand tools are all that’s required, and the process involves unplugging and unbolting the old unit and installing the new one. Disconnecting the battery first is the most important step.
Will this module fix my specific transmission code?
This module is the direct solution for a wide range of electronic transmission faults, including common DTCs like P0700 (Transmission Control System Malfunction) and various solenoid circuit codes. If diagnostics point to a faulty computer, this part will resolve those codes.
What happens if I order without providing my VIN?
To ensure a plug-and-play installation, providing your VIN is essential. Without it, we cannot program the module, and it will not function correctly in your vehicle. The order process will be delayed until we receive the VIN from you.
Does this part come with a warranty?
Yes, this transmission control module comes with a one-year warranty, giving you peace of mind and confidence in your repair.