Restore Crisp, Reliable Shifting to Your Workhorse Van
If your 2006-2014 GMC Savana 3500 is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, the problem is often a faulty Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a failing T42 module can bring your work van to a grinding halt. This replacement TCM, part number 24256960, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN. This means no expensive trips to the dealership for programming—it’s a true plug-and-play fix that restores the smooth, predictable performance you rely on every day.
Case Study: A Tricky Diagnosis
I had a 2011 Savana 3500 work van come into my shop last month. The owner, a local plumber, was frustrated. His van would slam into gear, and twice it had gone into limp mode on the highway, stuck in 3rd gear—a dangerous situation in traffic. His scan tool showed a generic P0700 (Transmission Control System Malfunction) and an intermittent P0752 (Shift Solenoid ‘A’ Stuck On). He had already replaced the solenoid with no change. After checking the wiring harness for chafing (a common issue on these vans), I connected our diagnostic tool. The data stream showed the TCM was commanding the solenoid correctly, but the feedback was erratic. This pointed directly to an internal failure in the module’s logic board. We installed one of our VIN-programmed T42 modules, and in under 30 minutes, the van was shifting perfectly. It’s a classic example of how symptoms can point to a solenoid, but the root cause is often the TCM itself.
Is Your Savana Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Ignoring these signs can lead to more significant transmission damage down the road.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0751, P0752, P0756, or other solenoid-related codes.
- ✔ Unexplained drops in fuel economy or a transmission that seems to be overheating.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Your 2006-2014 Savana 3500 TCM Installation
One of the best features of this module is its simple installation. You don’t need a lift or specialized tools, making it a perfect job for a DIYer or a quick swap for a professional technician. For the Savana and Express vans, the process is very accessible.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the 2006-2014 Savana 3500, the TCM is typically found in the engine compartment on the right-hand (passenger) side, mounted near the firewall.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly to avoid breaking them. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Securely plug in the electrical connectors until they click, ensuring a solid connection.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it run for a moment. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the previous failure.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page focuses on the 2006-2014 Savana 3500 TCM, it also fits the following models. Please verify the location described for your specific vehicle.
- Chevrolet: Silverado, Tahoe, Suburban, Avalanche, Express Van, Colorado, Cobalt, HHR, Impala, Monte Carlo
- GMC: Sierra, Yukon, Savana Van, Canyon, Envoy
- Buick: LaCrosse, Lucerne, Allure, Rainier, Rendezvous
- Cadillac: DTS
- Pontiac: G5, G6, Grand Prix, Pursuit
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
This part interchanges with numerous service numbers, including: 24242391, 24234503, 24252114, 24230461, 24234274, 24239224, 24255280, and more.
Frequently Asked Questions
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM-certified 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, eliminating the need for a dealership visit.
Do I need to send my old TCM back? Is there a core charge?
No. There is absolutely no core charge and you do not need to return your old part. You can dispose of it or keep it, saving you the time and hassle of return shipping.
Will this fix a P0700 code?
A P0700 code is a general fault request from the TCM to the main engine computer to turn on the check engine light. It is always accompanied by other, more specific transmission codes. If those specific codes point to a module or solenoid circuit failure, then yes, this part is very likely the solution.
Is this an OEM part?
This is a high-quality replacement part built to meet or exceed original equipment manufacturer (OEM) specifications for performance and durability. It is backed by our one-year warranty for your peace of mind.
How long does installation take for a 2006-2014 Savana 3500 Van?
For most people with basic hand tools, the installation on a Savana or Express van takes less than 30 minutes due to the accessible location in the engine bay.