If you’re dealing with the headache of a GMC Savana that won’t shift right, bangs into gear, or is stuck in limp mode, you’re not alone. As a technician with over two decades of experience under the hood, I’ve seen countless work vans sidelined by a faulty Transmission Control Module (TCM). The T42 module is the brain of your automatic transmission, and when it fails, it can cause chaos. This isn’t just an annoyance; it’s a reliability issue that costs you time and money. That’s why we offer this direct-fit, VIN-programmed Savana 1500 Van TCM, designed to get you back on the road without a costly trip to the dealership.
This module is the definitive fix for those frustrating, intermittent electronic transmission issues. We take the guesswork out of the repair by pre-programming the unit to your vehicle’s specific VIN. This means it arrives ready to install, communicating perfectly with your van’s powertrain and other systems from the moment you plug it in. It restores crisp, predictable shifting, proper torque converter lockup, and reliable performance for transmissions like the 4L60E and 4L80E found in your van.
From the Diagnostic Bay: The “Phantom” Shifting Problem
I remember a 2011 Savana 1500 that came into the shop with a classic complaint: “Sometimes it shifts hard, sometimes it feels like it’s slipping, and yesterday it wouldn’t shift out of 2nd gear.” The owner had already replaced a shift solenoid on a guess, but the problem persisted. A quick scan showed a P0700 (Transmission Control System Malfunction) and an intermittent solenoid circuit code. Instead of throwing more parts at it, we looked at the live data. The TCM was intermittently losing communication and sending erratic commands. This is a textbook T42 failure. We installed a VIN-programmed module, and the van was shifting like new in less than an hour. The problem wasn’t a mechanical fault inside the transmission; it was the computer controlling it.
Is Your Savana Exhibiting These Telltale TCM Failure Signs?
A failing TCM can mimic other transmission problems. Before you consider an expensive internal repair, check if your van is showing these common symptoms. A new Savana 1500 Van TCM is often the solution.
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ The vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Failure to upshift or downshift, leading to poor acceleration and fuel economy.
- ✔ The transmission seems to overheat more easily than normal.
DIY Installation: Get Your Van Back to Work in Under 30 Minutes
One of the best features of this module is the simple, straightforward installation. Since we handle the programming, you don’t need any specialized dealer tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the Module: On the 2006-2014 Savana Van, the TCM is typically located in the engine compartment on the right-hand (passenger) side.
- Remove the Old Unit: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new module in place and securely fasten the bolts. Reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the battery terminal. While our programming resolves most issues, it’s good practice to use a standard OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the van and take it for a test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM, part number 24235340, is a direct replacement for a wide range of General Motors vehicles. It is interchangeable with part numbers including 24252114, 24234503, 24230461, 24234274, and more. Please verify your model below:
- GMC Savana 1500/2500/3500 Van (2006-2014) – RH engine compartment
- Chevrolet Express 1500/2500/3500 Van (2006-2014) – RH engine compartment
- GMC Sierra & Chevrolet Silverado 1500/2500 (2007-2013) – Next to battery
- GMC Yukon & Chevrolet Tahoe/Suburban (2007-2009) – Next to battery
- Chevrolet Impala (2006-2011) – Lower air cleaner housing
- Buick LaCrosse / Allure (2006-2009) – Lower air cleaner housing
- Cadillac DTS (2006-2011) – RH front engine compartment
- Hummer H3 (2008-2010) – RH rear engine compartment
- …and many other GM cars, trucks, and SUVs. See the full fitment list for details.
Frequently Asked Questions
Do I need to take my van to the dealer for programming after installation?
No. This module comes fully programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you the time and expense of a dealership visit.
Is this a reliable fix for a P0700 code?
A P0700 code simply means the TCM has detected a fault. While this module often resolves the root cause (like internal short circuits causing solenoid codes), you should always confirm the specific codes stored in the TCM. If you have codes related to internal module failure or multiple solenoid circuits, this part is very likely the correct fix.
What tools do I need for installation?
You only need basic hand tools, typically a socket set to remove the mounting bolts and a flathead screwdriver to help with the connector tabs if they are stubborn. No special electronic tools are required.
Is there a core charge for my old TCM?
No, there is no core charge. You can keep your old part, so there’s no need to worry about return shipping or waiting for a core refund.
What kind of warranty is included?
This part is backed by our one-year warranty, giving you peace of mind that you’re installing a quality, dependable component in your vehicle.