If your 2006-2014 GMC Savana 3500 Van is suffering from unpredictable shifting, getting stuck in gear, or throwing transmission codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a faulty Transmission Control Module (TCM) can bring a dependable workhorse to a grinding halt. This isn’t just an inconvenience; it’s lost time and money. This T42 TCM, part number 24256960, is the definitive solution, arriving expertly programmed to your van’s specific VIN for a true plug-and-play repair.
The TCM is the electronic brain of your automatic transmission, controlling everything from shift points to torque converter clutch engagement. When it fails, the symptoms can be confusing and often misdiagnosed as a major mechanical failure. By replacing your old module with this quality-tested unit, you’re not just swapping a part—you’re restoring the precise, factory-intended operation of your transmission, ensuring your Savana is reliable for the long haul.
Case Study: A Tricky Diagnosis
I remember a 2011 Savana 3500 from a local plumbing company that came into the shop. The complaint was intermittent harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode), but only after it had been running for over an hour on hot days. The driver would have to pull over, shut it off, and wait. We checked the fluid, scanned for codes (only a generic P0700), and tested the solenoids, which all checked out. The issue was heat-soak affecting the internal circuits of the original TCM. We installed one of these VIN-programmed T42 modules, and the van was back in service the same afternoon with the problem completely resolved. It’s a classic failure mode for these units.
Is Your Work Van Showing These Red Flags?
A failing TCM will give you clear warning signs. If you’re experiencing any of the following, it’s highly likely your module is the culprit:
- ✔ Harsh, banging shifts or erratic, unpredictable gear changes.
- ✔ The transmission feels like it’s slipping between gears or has a long delay when shifting from Park to Drive.
- ✔ Your van is stuck in “limp mode,” usually in 2nd or 3rd gear, with no ability to upshift or downshift.
- ✔ The Check Engine Light or a transmission-specific warning light is on, with Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults.
- ✔ A noticeable drop in fuel economy or signs of the transmission running hotter than usual.
Get Your Savana Back to Work: A 30-Minute Install Guide
One of the best features of this module is the simple installation. You don’t need a trip to the dealership or expensive specialty tools. For a 2006-2014 Savana 3500 TCM, the process is straightforward.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: On the Savana 3500 Van, the TCM is typically found in the engine compartment on the right-hand (passenger) side. It’s a silver box with electrical connectors.
- Swap the Part: Carefully unplug the wiring harnesses from the old TCM. Unbolt it from its mounting bracket, remove it, and install the new module in its place.
- Reconnect: Securely plug the wiring harnesses into your new TCM. You’ll hear a click as they lock into place. Reconnect the negative battery terminal.
- Final Steps: Start the vehicle. While our VIN programming handles the critical setup, it’s best practice to use a standard OBD2 scan tool to clear any stored fault codes from the system’s memory.
Verified Fitment for Your General Motors Vehicle
While this part is a perfect fit for the Savana 3500, this T42 TCM is also compatible with a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E. Please verify your model and options below. This part directly interchanges with service numbers such as 24242391, 24234503, 24252114, and more.
- ✔ GMC SAVANA 3500 VAN (2006-2014) – Transmission; (RH engine compartment)
- ✔ Chevrolet Silverado & GMC Sierra (2007-2013)
- ✔ Chevrolet Tahoe, Suburban & GMC Yukon (2007-2009)
- ✔ Chevrolet Express & GMC Savana 1500/2500 (2006-2014)
- ✔ Cadillac DTS, Buick Lucerne, Chevrolet Impala (2006-2011)
- ✔ And many more models from Chevrolet, Pontiac, Saturn, Hummer, and Saab.
Frequently Asked Questions
What exactly does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your van’s engine computer and other systems right out of the box, avoiding a costly and time-consuming programming session at a dealership.
Is there a core charge? Do I need to send my old part back?
No, there is absolutely no core charge. You can keep your old part or dispose of it yourself, saving you the hassle and expense of return shipping.
Will this fix a P0700 transmission code?
A P0700 code is a general fault code, meaning the TCM has detected a problem and requested the Check Engine Light be turned on. Often, a failing TCM is the root cause. Replacing the module with our pre-programmed unit is a very common and effective fix for this code, especially when accompanied by shifting symptoms.
What tools do I need for installation?
For most applications, including the Savana van, you’ll only need basic hand tools: a wrench or socket to disconnect the battery terminal and another to unbolt the module from its bracket. A standard OBD2 scanner to clear codes after installation is also recommended.
What if I install it and still have problems?
While this module resolves the vast majority of electronic transmission issues, we’re here to help. Our parts come with a one-year warranty and expert support. If issues persist, it could indicate an underlying mechanical problem or a wiring issue, and our team can help guide you through further diagnostic steps.