If your 2006-2014 GMC Savana 3500 Van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you know how frustrating it can be—especially when your vehicle is your livelihood. As a technician with over 20 years of experience, I’ve seen countless work vans sidelined by a faulty Transmission Control Module (TCM). The symptoms often point to a major transmission failure, but the real culprit is frequently this electronic brain.
This is a direct-replacement T42 TCM, part number 24239926, designed to restore the crisp, reliable shifting your GM vehicle had from the factory. The most significant benefit? We program it to your van’s specific Vehicle Identification Number (VIN) before it ships. This means no expensive trips to the dealership for programming. It arrives at your door ready for a true plug-and-play installation, getting you back on the road and back to work with minimal downtime.
Case Study: A Tricky Diagnosis
A local contractor brought in his ’09 Savana 3500. The van was stuck in 3rd gear (limp mode) and had a P0752 code (Shift Solenoid A Stuck On). He had already replaced the solenoid, but the problem persisted. After a quick diagnostic check, I suspected the TCM. The internal drivers that control the solenoids are a common failure point. We installed one of our VIN-programmed T42 modules, cleared the codes, and the van was shifting perfectly in under an hour. He saved hundreds by avoiding a dealership visit and unnecessary parts swaps.
Is Your Van Showing These Telltale Signs?
A failing TCM can mimic other, more severe transmission issues. Here’s what to look for:
- ✔ Unpredictable or harsh gear changes that slam into gear.
- ✔ The transmission refuses to shift up or down, or feels like it’s slipping between gears.
- ✔ Your vehicle is stuck in “limp mode,” usually locked in 2nd or 3rd gear.
- ✔ The Check Engine Light is on with transmission-specific Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0751, P0755, etc.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
Your 30-Minute Path Back to Work
Installing your new Savana 3500 Transmission Module is a straightforward job that you can do with basic hand tools. For the Savana, it’s typically located in the engine compartment on the right-hand side, making it easily accessible.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the Old Module: On your Savana Van, find the TCM on the RH side of the engine bay. It will have several large electrical connectors.
- Swap the Module: Carefully unplug the wiring harnesses. Unbolt the old module from its mounting bracket and set it aside. Bolt the new module in its place and securely reconnect the wiring harnesses.
- Final Steps: Reconnect the battery terminal. Start the vehicle and use a standard OBD2 scan tool to clear any stored fault codes from the previous module. Take the van for a test drive to confirm smooth operation.
Verified Vehicle Compatibility
This module is a direct fit 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 Savana 3500 Transmission Module, it also fits:
- Chevrolet: Silverado, Tahoe, Suburban, Express, Impala, Cobalt, HHR, Avalanche
- GMC: Sierra, Yukon, Savana, Envoy, Canyon
- Buick: LaCrosse, Lucerne, Rainier, Allure
- Cadillac: DTS
- Pontiac: G5, G6, Grand Prix
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
This part interchanges with service numbers 24252114, 24234503, 24239926, 24256960, and more.
What does ‘VIN Programmed’ actually mean?
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit VIN into the module before shipping. This ensures it communicates perfectly with your van’s engine computer and other systems, just like a part from the dealership, but without the extra cost and hassle of a programming service.
Do I need any special tools for this installation?
No special tools are required. A basic socket set to remove the mounting bolts and a flathead screwdriver to help release the connector tabs are typically all you’ll need. An OBD2 scanner is recommended to clear old codes after installation.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. This module often resolves the underlying issue that causes the P0700, such as a solenoid circuit fault. However, you should always diagnose the specific codes that accompany the P0700.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it yourself, saving you the time and expense of shipping it back.