Restore Dependable Shifting to Your GMC Savana Van
As a mechanic with two decades of experience under the hood, I’ve seen countless GMC and Chevy vans come into the shop with the same frustrating complaints: harsh, unpredictable shifting, getting stuck in one gear, or a check engine light that just won’t go away. More often than not, the culprit is a failing T42 Transmission Control Module (TCM). If your 2006-2014 Savana 1500 Van is making your workday or family trip a nightmare, this is the reliable, straightforward fix you need. This isn’t just a part; it’s a solution to restore your van’s performance and your peace of mind.
This OEM-quality T42 TCM, also known by part number 24240400, is the brain of your automatic transmission. It precisely manages shift timing, hydraulic pressure, and torque converter lockup for the 4L60E, 4L65E, and 4L70E transmissions. When it fails, communication breaks down, leading to the symptoms you’re likely experiencing. Our module comes pre-programmed to your van’s specific Vehicle Identification Number (VIN), making it a true plug-and-play solution that eliminates the need for an expensive trip to the dealership for programming.
Case Study: The Limp-Mode Work Van
A local contractor brought in his ’09 Savana 1500, a critical vehicle for his business. It was stuck in what we call ‘limp mode’—locked in 3rd gear. He couldn’t accelerate properly, and his fuel economy was terrible. His scanner showed a generic P0700 transmission fault code. After confirming power and ground to the module were good, we knew the internal logic of the TCM had failed. Instead of a costly, multi-day repair at a dealership, we installed one of our VIN-programmed T42 modules. In under an hour, the van was shifting perfectly, the codes were gone, and he was back on the job. This is the kind of fast, effective repair that keeps businesses running.
Is Your Savana Van Exhibiting These Telltale Signs?
A failing TCM doesn’t heal itself; it only gets worse. Here are the common symptoms I see in the shop that point directly to a faulty module:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ The Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Inconsistent or no upshifting/downshifting.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Replacing Your TCM
One of the best features of this part is how simple the installation is. You don’t need a vehicle lift or specialized tools. For your Savana van, the process is especially easy.
- 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 1500 Van, the TCM is conveniently located 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, pre-programmed TCM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock in.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any lingering fault codes from the ECU.
Verified Vehicle Compatibility
This module is a direct replacement for part number 24240400 and is interchangeable with several other GM service numbers. It is guaranteed to fit the following models, among many others:
- GMC Savana 1500 Van (2006-2014) – Transmission; (RH engine compartment)
- GMC Savana 2500/3500 Van (2006-2014) – Transmission; (RH engine compartment)
- Chevrolet Express 1500/2500/3500 Van (2006-2014) – Transmission; (RH engine compartment)
- Chevrolet Silverado & GMC Sierra 1500 (2007-2013) – Transmission; (next to battery)
- Chevrolet Tahoe & GMC Yukon (2007-2009) – Transmission; (next to battery)
- Chevrolet Impala (2006-2011) – Transmission; (lower air cleaner housing)
- Cadillac DTS (2006-2011) – Transmission; (RH front engine compartment)
- Hummer H3 (2008-2010) – Transmission; (RH rear engine compartment)
This is not a complete list. Please verify your part number or contact us with your VIN to ensure perfect fitment.
Frequently Asked Questions
What exactly does ‘VIN Programmed’ mean for me?
It means we load your vehicle’s unique VIN into the module before we ship it. This ensures it communicates perfectly with your van’s other computers (like the ECU) right out of the box, just like an OEM part from the dealer, but without the extra programming fee or appointment.
Do I need any special tools for this installation?
No. Basic hand tools, like a socket set to remove the mounting bolts and your hands to undo the connectors, are all that’s typically required. The entire job usually takes less than 30 minutes.
Will this fix my P0700 trouble code?
A P0700 code is a generic fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like a failed internal driver that triggers a solenoid code), you should always diagnose any specific codes (e.g., P0753) that accompany the P0700. In many cases, replacing a faulty TCM is the correct fix.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old part or recycle it at your convenience without the hassle of shipping it back to us.
How is this different from a used part from a junkyard?
A used part from another vehicle will not be programmed for your VIN and will not function correctly. Furthermore, it carries the same risk of failure as your original part. Our modules are tested, loaded with the latest GM software for your vehicle, and backed by a one-year warranty for reliability you can count on.