Restore Peak Performance to Your Workhorse Van
If your 2006-2014 GMC Savana 3500 is experiencing erratic shifting, getting stuck in gear, or throwing transmission codes, a failing Transmission Control Module (TCM) is the most likely culprit. As the electronic brain of your automatic transmission, the T42 TCM is responsible for every gear change and torque converter operation. When it fails, it can sideline your work van, costing you time and money. This replacement module, part number 24243921, is the definitive solution to get your vehicle back on the road and running reliably.
As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can mimic a catastrophic transmission failure. Before you consider an expensive and time-consuming transmission rebuild, a proper diagnosis often points to this critical electronic component. Our modules are meticulously prepared and VIN-programmed with the latest GM software, ensuring they are a direct-fit, plug-and-play solution. This eliminates the need for a costly trip to the dealership for programming, saving you hundreds of dollars and significant downtime.
Case Study: The Savana That Wouldn’t Shift
A local contractor brought in his 2011 Savana 3500, convinced the transmission was shot. It was stuck in 3rd gear (limp mode) and the check engine light was on, showing a P0700 code. He was ready for a massive repair bill. After a quick scan and check of the wiring, I suspected the TCM. We swapped in a VIN-programmed module, cleared the codes, and took it for a test drive. The van shifted perfectly, just like it did from the factory. A 30-minute job saved him from a $3,000+ repair. This is a common story for the Savana 3500 Transmission Module.
Is Your Van’s Transmission Showing These Symptoms?
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ 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, P0750-P0758, or other solenoid-related faults.
- ✔ Poor acceleration and decreased fuel economy.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
Replacing the Savana 3500 Transmission Module is a simple job that most DIY mechanics or professionals can complete in under 30 minutes. No specialized tools are required.
- 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 Savana and Express vans, the TCM is typically found in the engine compartment on the right-hand (passenger) side.
- 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, VIN-programmed module into place. Securely reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to run for a few minutes. If you have a basic scan tool, use it to clear any stored fault codes. Test drive the vehicle to confirm smooth shifting.
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, 4L70E, and 4L80E. While this page focuses on the Savana 3500 Transmission Module, it is also compatible with the following models. Always verify the part number (24243921 or an interchange number) to ensure a perfect match.
- GMC: Savana 1500/2500/3500 Van (06-14), Sierra, Yukon, Envoy, Canyon
- Chevrolet: Express 1500/2500/3500 Van (06-14), Silverado, Tahoe, Suburban, Impala, Cobalt, HHR, Colorado
- Buick: LaCrosse, Lucerne, Allure, Rainier, Rendezvous
- Cadillac: DTS
- Pontiac: G6, Grand Prix, G5
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
Interchangeable Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24255280, 24256960, YNXS.
Frequently Asked Questions
What does ‘VIN Programmed’ mean for me?
It means this module arrives ready for installation. We flash it with your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software. This ensures it communicates perfectly with your van’s other computers (like the ECM) right out of the box, with no expensive dealer programming required.
Is this a difficult part to install myself?
Not at all. For most vehicles, including the Savana van, it’s a simple bolt-off, bolt-on process that takes less than 30 minutes with basic hand tools. The most common location is on the passenger side of the engine bay.
Will this fix a P0700 transmission code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like internal shorts or failed drivers that trigger other codes), you should always diagnose any accompanying codes. In many cases, replacing a faulty TCM will clear the P0700 and related codes.
Do I need to send my old part back?
No. There is no core charge for this part. You can keep your old module or dispose of it, making the process hassle-free.
What kind of warranty is included?
This module comes with a one-year warranty, giving you peace of mind and confidence in your repair.