If your 2006-2014 GMC Savana 1500 is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make your reliable workhorse feel unpredictable and unsafe. This is the definitive, no-hassle solution to restore your van’s performance and get you back to work with confidence.
This OEM-quality T42 TCM, part number 24238856, arrives at your door fully pre-programmed to your van’s specific Vehicle Identification Number (VIN). This critical step ensures seamless communication with your vehicle’s powertrain, eliminating the need for expensive and time-consuming dealership programming. It’s a true plug-and-play fix designed for both professional mechanics and savvy DIYers.
Is Your Savana Van Exhibiting These Transmission Problems?
A failing TCM often broadcasts clear warning signs. From my experience in the shop, these are the most common symptoms I see that point directly to a bad Savana 1500 Transmission Module:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light, frequently with Diagnostic Trouble Codes (DTCs) like P0700 (Transmission Control System Malfunction) or various solenoid codes (e.g., P0750-P0758).
- ✔ Inability to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ Intermittent loss of communication with the module, causing unpredictable behavior.
- ✔ In severe cases, a complete loss of transmission function.
From the Diagnostic Bay: The Case of the Commercial Fleet
A local contractor brought in one of his 2011 Savana 1500 work vans complaining of intermittent ‘no-shift’ conditions after the van warmed up. He’d already replaced two shift solenoids based on codes, but the problem persisted. We hooked up our pro-level scan tool and monitored live data. We saw the TCM commanding shifts, but the gear change was harsh and delayed. Then, for a few seconds, the TCM data feed would drop out entirely. This intermittent communication failure is a classic sign of internal heat-related failure in these T42 modules. We installed one of our VIN-programmed TCMs, and the van was back in reliable service the same afternoon. The client was so pleased with the permanent fix that we ended up replacing the modules on his three other vans as a preventative measure.
A Straightforward Guide to a 30-Minute Installation
One of the best features of this part is its ease of installation. You don’t need a vehicle lift or specialized transmission tools. For the GMC Savana 1500, the process is incredibly accessible.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the onboard systems.
- Locate the Module: On the 2006-2014 Savana vans, the TCM is conveniently located in the engine compartment on the right-hand (passenger) side. It’s typically a silver box with large electrical connectors.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket. Usually, just a few small bolts hold it in place.
- Install the New Module: Bolt the new, pre-programmed TCM into the same location. Reconnect the wiring harnesses, ensuring they click securely into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle. While our programming handles the critical setup, it’s always good practice to use a basic scan tool to clear any stored DTCs from the previous fault.
With no core charge, you can simply discard your old, faulty part without the hassle of shipping it back.
Verified Vehicle Compatibility List
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles. While this page is dedicated to the Savana 1500 Transmission Module, it also fits the following models. Please verify the location noted for your specific vehicle.
- GMC SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
- GMC SAVANA 2500/3500 VAN 06-14 Transmission; (RH engine compartment)
- Chevrolet EXPRESS 1500/2500/3500 VAN 06-14 Transmission; (RH engine compartment)
- Chevrolet SILVERADO 1500 PICKUP 07-13 Transmission; (next to battery)
- GMC SIERRA 1500 PICKUP 07-13 Transmission; (next to battery)
- Chevrolet TAHOE / SUBURBAN 1500 07-09 Transmission; (next to battery)
- GMC YUKON / YUKON XL 1500 07-09 Transmission; (next to battery)
- And many more GM cars, trucks, and SUVs from 2006-2014. A full list is provided in the raw data.
This module is interchangeable with numerous part numbers, including: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, and more.
Frequently Asked Questions
Do I need to take my van to the dealer after installing this?
Absolutely not. The main benefit of our service is that we program the module to your vehicle’s VIN before we ship it. This makes it a true plug-and-play part, saving you the time and expense of a dealership visit.
Is this part difficult to install for a DIYer?
Not at all. For a Savana van, this is one of the easier electronic module replacements. It’s located in the engine bay and requires only basic hand tools. Most customers complete the job in under 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general code indicating the TCM has detected a fault. Often, the fault is the TCM itself. Replacing a failing TCM with our pre-programmed unit is a very common and effective way to resolve a P0700 code and related specific codes.
What kind of warranty is included?
This module comes with a one-year, hassle-free warranty, giving you peace of mind and confidence in your repair.
What information do you need from me to program it?
During the checkout process, we will ask for your vehicle’s 17-digit VIN. This is crucial for us to load the correct GM software for your specific van’s configuration.