Restore Peak Performance to Your Workhorse Van
As a technician with over two decades of experience, I know that when a work van like the GMC Savana 3500 goes down, it’s more than an inconvenience—it’s a direct hit to your bottom line. If your van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, the culprit is often a faulty Transmission Control Module (TCM). This replacement T42 TCM, part number 24238856, is the definitive solution for your 2006-2014 Savana 3500 Van Transmission Module, arriving fully programmed to your vehicle’s VIN for a true plug-and-play repair.
Case Study: The Ghost in the Transmission
A local contractor brought in his ’09 Savana 3500, frustrated because it kept getting stuck in 3rd gear (limp mode) and throwing a P0752 (Shift Solenoid ‘A’ Stuck On) code. He had already replaced the solenoid twice at another shop, but the problem kept returning. After a quick diagnostic check, I suspected the TCM. The internal drivers that control the solenoids can fail, sending erratic signals that mimic a bad solenoid. We installed one of our VIN-programmed T42 modules, cleared the codes, and the van was back on the road in under an hour, shifting perfectly. The problem wasn’t the solenoid; it was the brain telling it what to do. This is a classic failure I’ve seen hundreds of times on these GM platforms.
Why a VIN-Programmed Module is Essential
Your Savana’s transmission relies on precise data from the TCM to shift smoothly and efficiently. Our process eliminates the guesswork and costly dealership visits. We flash the module with the latest GM software updates specific to your VIN, ensuring it communicates flawlessly with your van’s engine computer and other systems right out of the box. This resolves common software-related diagnostic trouble codes (DTCs) and restores the original factory performance, protecting your transmission from premature wear caused by a failing module.
Is Your Savana Exhibiting These Telltale TCM Failure Signs?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (limp mode) and won’t shift up or down.
- ✔ Check Engine Light or Transmission Warning Light is illuminated with codes like P0700, P0750, P0751, P0752, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel economy.
- ✔ The transmission seems to slip between gears or fails to engage drive or reverse.
- ✔ Complete loss of communication with the TCM, preventing diagnostics.
Your Straightforward Path to Installation
- ✔ Safety First: Always disconnect the negative terminal on your vehicle’s battery before starting any electrical work.
- ✔ Locate the Module: On the 2006-2014 Savana 3500 Van, the transmission module is typically found in the engine compartment on the right-hand (passenger) side.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket or wrench to remove the mounting bolts holding the old TCM in place.
- ✔ Install the New Module: Mount your new, pre-programmed module in the same location and secure it with the original bolts.
- ✔ Reconnect and Finalize: Plug the electrical harnesses firmly into the new module. Reconnect the negative battery terminal. While the battery disconnect clears most codes, it’s good practice to use a basic OBD2 scan tool to clear any remaining DTCs.
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles. While this page focuses on the 2006-2014 Savana 3500 Van Transmission Module, it is also compatible with the following models. Please verify your part number (24238856 or an interchange) and model for guaranteed fitment.
- GMC: Savana 1500/2500/3500, Sierra 1500/2500, Yukon, Yukon XL, Envoy, Canyon
- Chevrolet: Express 1500/2500/3500, Silverado 1500/2500, Tahoe, Suburban, Avalanche, Impala, Cobalt, HHR, Colorado, Malibu, Monte Carlo, SSR
- Buick: LaCrosse, Lucerne, Allure, Rainier, Rendezvous
- Cadillac: DTS
- Pontiac: G5, G6, Grand Prix, Pursuit
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
This module interchanges with part numbers: 24242391, 24234503, 24252114, 24230461, 24234274, 24235340, 24235754, 24239224, 24239926, 24240400, 24241806, 24243901, 24243921, 24255280, 24256960, and more.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This module comes pre-programmed to your vehicle’s specific VIN. It is ready for installation right out of the box, saving you a trip to the dealership and additional programming fees.
Is this a difficult part for a DIY mechanic to install?
Not at all. For most models, including the Savana van, this is a very straightforward repair. It’s typically mounted in an accessible location in the engine bay and requires only basic hand tools. The entire process can usually be completed in under 30 minutes.
What is the warranty on this part?
This transmission control module is backed by our one-year warranty, giving you peace of mind and confidence in your repair.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module without any hassle or need to ship it back.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the Engine Control Module (ECM) to turn on the check engine light. A failing TCM is a very common cause of this code. Replacing the module will often resolve the P0700 and any other transmission-specific codes that were present.