Restore Your Van’s Shifting Performance
If your 2006-2014 GMC Savana 2500 is your workhorse, you can’t afford the downtime that comes with transmission problems. Harsh shifting, getting stuck in gear, or a lit check engine light can bring your business to a halt. As a technician with over two decades of experience, I’ve seen countless GM vehicles, especially hardworking vans, sidelined by a faulty Transmission Control Module (TCM). The original T42 modules are prone to failure from heat cycles and electrical stress, leading to frustrating and unpredictable behavior. This isn’t just an annoyance; it’s a reliability issue that can leave you stranded.
This replacement T42 TCM, part number 24234503, is the definitive solution. The most critical benefit is that it arrives at your door pre-programmed to your van’s specific Vehicle Identification Number (VIN). This eliminates the most expensive and time-consuming part of the repair: a trip to the dealership for programming. You get a direct-fit component that communicates flawlessly with your vehicle’s systems right out of the box, restoring the smooth, decisive shifting you depend on.
Case Study: A Tricky Diagnosis
I remember a fleet manager bringing in a 2011 Savana 2500. The complaint was intermittent ‘no-shift’ conditions and a generic P0700 code. The local shop had already replaced two shift solenoids without success. After connecting my scan tool, I noticed the data stream from the TCM was dropping out intermittently when the engine bay got hot. The module itself was the culprit, creating phantom codes. We installed a VIN-programmed TCM, and the van was back in service the same afternoon. It’s a classic example of how a failing module can mimic other component failures, making accurate diagnosis key.
Is Your Savana Van Showing These Symptoms?
A failing TCM often gives clear warning signs. If you’re experiencing any of the following, it’s highly likely your module is the problem. In my shop, these symptoms almost always point to the TCM, especially on the 4L60E and 4L80E transmissions found in these vans.
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode” (usually second or third gear).
- ✔ Check Engine Light is on with transmission-specific Diagnostic Trouble Codes (DTCs) like P0700, P0751, P0756.
- ✔ The transmission refuses to upshift or downshift properly.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
One of the best parts about this repair is how accessible it is for a DIY mechanic or a professional technician looking to save time. For the Savana 2500 Transmission Module, the process is quick and requires basic hand tools.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work. This prevents short circuits and helps reset the vehicle’s electronic systems.
- Locate the Module: On the Savana and Express vans, the TCM is typically mounted in the engine compartment on the right-hand (passenger) side. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Then, unbolt the module from its mounting bracket. There are usually just a few bolts holding it in place.
- Install the New Module: Bolt the new, pre-programmed module into place. Reconnect the wiring harnesses, ensuring they click securely into position.
- Final Steps: Reconnect the battery terminal. 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. Start the vehicle and test drive 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 from 2006-2014. While this page focuses on the Savana 2500 Transmission Module, it is also compatible with the following models. Please verify the location noted for your specific vehicle.
Interchangeable Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, and more.
Fits: GMC Savana 1500/2500/3500 (06-14), Chevrolet Express 1500/2500/3500 (06-14), Chevrolet Silverado (07-13), GMC Sierra (07-13), Chevrolet Tahoe/Suburban (07-09), GMC Yukon (07-09), Cadillac DTS (06-11), Buick Lucerne (06-11), Chevrolet Impala (06-11), Hummer H3 (08-10), and many others. Please use the fitment checker to confirm for your specific vehicle.
Frequently Asked Questions
Do I need to take my van to the dealer after installing this?
No. This module is delivered pre-programmed to your vehicle’s VIN. The service eliminates the need for any additional programming, saving you time and money.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a very straightforward job. On a Savana 2500, the module is easily accessible in the engine bay, and the entire process typically takes less than 30 minutes.
What is the warranty on this module?
This part comes with a one-year warranty, ensuring it provides reliable service and peace of mind.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request. Often, it is triggered by the failing TCM itself or by faults the TCM can no longer correctly interpret. Replacing a faulty TCM is a very common and effective way to resolve a P0700 code and the more specific codes that accompany it.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of returning it.