Fix Your Van’s Shifting Problems with a Pre-Programmed TCM
If your 2006-2014 GMC Savana 3500 is struggling with harsh shifting, getting stuck in gear, or throwing transmission codes, the culprit is often a failing Transmission Control Module (TCM). As a master technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline a reliable workhorse. This isn’t just an inconvenience; it’s downtime that costs you money. This OEM-quality T42 TCM, part number 24240400, is the definitive solution, arriving pre-programmed to your van’s specific VIN. This means you can skip the expensive trip to the dealership for programming—it’s a true plug-and-play fix that restores the crisp, reliable shifting you depend on.
From the Diagnostic Bay: The Case of the Limp-Mode Work Van
A local contractor brought in his 2011 Savana 3500, complaining it was stuck in what felt like third gear. The check engine light was on, and his scanner pulled a P0700 (Transmission Control System Malfunction) and a P0752 (Shift Solenoid ‘A’ Stuck On). He was worried about a full transmission rebuild. After confirming the wiring and solenoids were good, I knew the T42 TCM was the weak link—a common failure point due to heat cycles and vibration. Instead of a multi-day, thousand-dollar repair, we installed one of our VIN-programmed modules. In under an hour, the codes were cleared, the van was shifting perfectly, and he was back on the job. This is the value of a direct-fit, pre-programmed part.
Is Your Savana Van Showing These Telltale Signs?
A failing TCM doesn’t always mean a catastrophic failure. Often, the symptoms start small and get progressively worse. If you’re experiencing any of the following, it’s time to inspect your Savana 3500 TCM.
- ✔ Harsh, clunky, or erratic gear shifts.
- ✔ The vehicle is stuck in “limp mode” and won’t shift out of 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0751, P0753, P0756, or other solenoid-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable decrease in fuel economy.
- ✔ Complete loss of communication with the transmission module.
DIY-Friendly Installation: Get Your Van Running in 30 Minutes
One of the best features of this module is its straightforward installation. You don’t need a lift or specialized transmission tools. For the Savana and Express vans, the process is especially simple.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the TCM: On the Savana 3500, the TCM is typically found 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 old module from its mounting bracket.
- Install the New Module: Mount the new TCM onto the bracket and securely plug in the electrical connectors. You should hear a click as they lock into place.
- Reconnect and Verify: Reconnect the battery terminal. Start the vehicle and let it idle for a moment. Use a basic OBD2 scan tool to clear any stored fault codes. Test drive to confirm smooth shifting has been restored.
Verified Fitment For Your General Motors Vehicle
This T42 TCM is a direct replacement for part number 24240400 and interchanges with several other GM service numbers, including 24252114, 24234503, 24230461, 24234274, and more. It is designed for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E.
This part is confirmed to fit the following models:
- GMC Savana 1500/2500/3500 Van (2006-2014)
- Chevrolet Express 1500/2500/3500 Van (2006-2014)
- Chevrolet Silverado & GMC Sierra 1500/2500 (2007-2013)
- Chevrolet Tahoe, Suburban & GMC Yukon (2007-2009)
- Chevrolet Impala & Monte Carlo (2006-2011)
- Cadillac DTS (2006-2011)
- Hummer H3 (2008-2010)
- …and many other GM cars, trucks, and SUVs from 2006-2014. Please verify your specific model in the detailed fitment list.
Frequently Asked Questions
Do I need to take my van to the dealer after installation?
No. This module comes fully programmed to your vehicle’s VIN. It’s a plug-and-play solution that does not require any additional programming or flashing from a dealership, saving you time and money.
What is the warranty on this Savana 3500 TCM?
This part is backed by our comprehensive one-year warranty, giving you peace of mind that you’re installing a quality, reliable component.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it at your convenience without the hassle of returning it.
Will this fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause (like an internal short or failed driver that triggers other codes), you should always diagnose any related codes (e.g., for specific solenoids) to ensure there isn’t an external wiring or component issue.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. This ensures we can program the module with the correct software and calibrations for your specific Savana van.