Is Your Savana 3500 Shifting Erratically?
If you’re dealing with harsh shifting, delayed gear engagement, or a check engine light that points to transmission issues, a failing Transmission Control Module (TCM) is the likely culprit. The TCM is the electronic brain of your 2006-2014 GMC Savana 3500’s automatic transmission, responsible for orchestrating every gear change and ensuring smooth, efficient operation. When it fails, it can leave your hardworking van feeling unpredictable and unreliable, sometimes even stuck in a single gear, known as “limp mode.”
This genuine OEM-quality T42 TCM, part number 24238856, is the definitive solution. It arrives pre-programmed to your van’s specific Vehicle Identification Number (VIN), eliminating the need for expensive dealership visits for programming. This plug-and-play module restores the precise, factory-spec performance your transmission was designed for, getting you back on the road with confidence.
From the Diagnostic Bay
We had a 2011 Savana 3500 work van come in that was stuck in 3rd gear. The driver thought the entire transmission was shot and was bracing for a multi-thousand dollar bill. We scanned it and pulled a P0700 code along with several solenoid circuit faults. Instead of immediately quoting a new transmission, we checked the TCM connectors for corrosion and then swapped in one of our VIN-programmed T42 modules. In less than 30 minutes, all the codes were gone, the van was shifting perfectly through all gears, and the customer saved a fortune. It’s often the brain, not the brawn, that fails.
Symptoms of a Failing Savana 3500 Transmission Module
A faulty TCM can manifest in various ways, often mimicking more severe mechanical transmission problems. Before you condemn your entire transmission, check if you’re experiencing any of these common symptoms. Replacing the TCM can often be a straightforward and cost-effective fix.
- ✔ Erratic or Harsh Shifting: Your van may slam into gear, hesitate between shifts, or feel generally unpredictable.
- ✔ Stuck in Limp Mode: The transmission may refuse to shift out of 2nd or 3rd gear as a protective measure.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): You’ll see codes like P0700 (Transmission Control System Malfunction) or specific solenoid codes (e.g., P0751, P0756).
- ✔ No Upshift or Downshift: The transmission may fail to shift up or down as needed, leading to poor acceleration and high RPMs.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter lockup issues caused by a bad TCM can significantly reduce your MPG.
- ✔ Complete Communication Loss: In severe cases, the vehicle may not start, or the gear selector indicator on the dash may be blank.
Plug-and-Play Solution with VIN Programming
The biggest hurdle in replacing modern electronic modules is the need for specialized programming. We solve that for you. Simply provide your VIN during checkout, and our technicians will flash this module with the latest GM software specific to your 2006-2014 Savana 3500. This ensures that the module communicates flawlessly with your van’s Engine Control Unit (ECU) and other systems right out of the box. No trips to the dealer, no extra tools, no hidden fees.
Installation is simple for a DIY mechanic or any professional technician. The TCM is typically located in the engine compartment on the right-hand side. Disconnect the battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. We recommend using a basic scan tool to clear any stored DTCs after installation for a clean slate.
Broad GM Compatibility
While this is a perfect fit for your Savana 3500, this T42 TCM is also compatible with a wide range of other GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. It interchanges with numerous part numbers, including 24252114, 24234503, 24230461, and more, making it a versatile solution for many models from Chevrolet, GMC, Buick, Cadillac, Pontiac, Saturn, and Hummer. Please verify the part number or use our vehicle fitment tool to confirm compatibility.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. This module comes pre-programmed to your vehicle’s VIN. Simply provide your VIN at checkout, and the module will arrive ready for plug-and-play installation, with no additional programming required.
Where is the TCM located on my 2006-2014 Savana 3500?
On the Savana and Express vans of this generation, the Transmission Control Module is typically found in the engine compartment, mounted on the right-hand (passenger) side.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. This faulty TCM is very often the root cause. Replacing it with our pre-programmed unit is a common and effective solution for clearing P0700 and related transmission codes.
Is there a core charge for my old part?
No, there is no core charge associated with this part. You can keep your old module without the hassle of returning it.
What is the warranty on this part?
This Transmission Control Module is backed by our standard one-year warranty, covering any defects in materials or workmanship for your peace of mind.