Restore Peak Transmission Performance to Your GM Vehicle
Is your 2006-2014 GMC Savana 3500 experiencing delayed shifts, harsh gear engagement, or getting stuck in limp mode? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating shift points, managing torque converter lockup, and monitoring system health. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage. This OEM-quality T42 TCM, part number 24235754, is the definitive solution to restore your vehicle’s smooth and reliable operation.
From the Diagnostic Bay
We had a 2009 Silverado 1500 come in with a classic complaint: harsh 1-2 shifts and a P0752 code for Shift Solenoid A Stuck On. The previous shop had already replaced the solenoid twice with no change. The technician was convinced the valve body was faulty. However, experience told us to look at the command center first. We checked the data stream from the TCM and found erratic voltage commands being sent to that specific solenoid. The problem wasn’t the solenoid or the valve body; it was a failing driver inside the original TCM. We installed one of our VIN-programmed T42 modules, cleared the codes, and the truck shifted perfectly. It saved the customer hundreds of dollars and a lot of unnecessary mechanical work.
Common Symptoms of a Failing Savana 3500 TCM
A faulty TCM can manifest in various ways, often mimicking mechanical transmission problems. Before condemning your transmission, check if your vehicle is exhibiting any of these common electronic faults. Replacing a faulty Savana 3500 TCM is often the most direct and effective repair.
- ✔ Harsh, erratic, or delayed gear shifting.
- ✔ Vehicle is stuck in a single gear, often referred to as “limp mode” (usually 2nd or 3rd gear).
- ✔ The check engine light or transmission warning light is illuminated on the dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (P0750-P0774).
- ✔ Inability to upshift or downshift properly as engine RPM changes.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ Intermittent loss of communication with the TCM, causing unpredictable behavior.
The Plug-and-Play Advantage: Pre-Programmed for Your VIN
One of the biggest hurdles in replacing modern electronic modules is the need for expensive dealership programming. Our T42 TCMs eliminate this step entirely. We pre-program each module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This process loads the latest GM software and calibrations specific to your Savana 3500’s powertrain configuration. The result is a true plug-and-play component. Simply install the module, connect the wiring harnesses, and you’re ready to go. No need for a trip to the dealer, no special tools, and no additional costs.
Installation and Compatibility
Installation is straightforward for the DIY mechanic or professional technician. On most GMC Savana and Chevrolet Express vans, the TCM is located in the engine compartment on the right-hand (passenger) side. Always disconnect the vehicle’s battery before beginning the installation to prevent electrical damage and help reset the system. After installing the new module, reconnect the battery and use a standard OBD2 scan tool to clear any stored fault codes. This replacement Savana 3500 TCM is a direct fit for a wide range of GM trucks, vans, and cars that use the T42 controller with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24230461, and more, ensuring broad compatibility.
Frequently Asked Questions
What is VIN programming and why is it necessary?
VIN programming is the process of loading your vehicle’s specific software and calibration files onto the TCM. This ensures the module communicates correctly with the engine controller and other systems, managing shift points, torque converter strategy, and electronic pressure control for your exact vehicle configuration. Without it, the transmission will not function correctly.
Is this a plug-and-play part?
Yes. Because we program the module to your VIN before shipping, it arrives ready for installation. No additional programming or dealer visits are required. Just install it, clear any old codes, and drive.
Where is the TCM located on my 2008 GMC Savana 3500?
On the 2006-2014 Savana and Express vans, the Transmission Control Module is typically found in the engine bay, mounted on the right-hand (passenger) side. Always confirm the location on your specific vehicle before starting the replacement.
Will this fix my 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. This module will fix the P0700 code if the root cause is an internal failure of the TCM itself, which is a very common scenario.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep your old module, which saves you the time and expense of shipping a core back.