If your GMC Savana 3500 work van is experiencing unpredictable shifting, getting stuck in gear, or throwing transmission codes, your Transmission Control Module (TCM) is the likely culprit. As a mechanic with over two decades of diagnostic experience, I’ve seen firsthand how a failing TCM can sideline a perfectly good work vehicle. This T42 Transmission Control Module, corresponding to part number 24235754, is the definitive, hassle-free solution to restore your van’s performance and reliability.
This isn’t just a replacement part; it’s a complete fix. We pre-program each module to your vehicle’s specific VIN before it ships. This crucial step ensures that the TCM communicates flawlessly with your van’s powertrain and eliminates the need for an expensive and time-consuming trip to the dealership for programming. For a professional or a DIYer, this means you can get your 2006-2014 Savana 3500 TCM replaced and the vehicle back in service in under an hour.
Case Study: A Tricky Diagnosis
A local contractor brought in his ’09 Savana 3500, complaining of intermittent, violent downshifts and occasional limp mode, especially after long highway drives. He’d already replaced a shift solenoid with no improvement. His scanner showed a generic P0700 code. In my shop, we’ve learned that heat soak can cause these T42 modules to fail intermittently, leading to confusing symptoms. Instead of a costly transmission teardown, we recommended replacing the TCM. A new, VIN-programmed module solved all his issues immediately. It’s a common failure point I’ve diagnosed hundreds of times on these GM workhorses.
Is Your Savana Van Exhibiting These Transmission Issues?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s time to consider a replacement:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (often called ‘limp mode’).
- ✔ The Check Engine Light or a transmission warning light is on, with DTCs like P0700, P0750, or other solenoid-related codes.
- ✔ Inability to upshift or downshift properly, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
- ✔ Complete loss of communication with the transmission.
DIY-Friendly Installation: Get Your Van Running in Under 30 Minutes
Replacing the 2006-2014 Savana 3500 TCM is a straightforward job that requires basic hand tools. Because our modules arrive pre-programmed, you can avoid complex procedures and dealer visits.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and reset the system.
- Locate the Module: On the Savana 3500 Van, the TCM is typically found in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs. 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.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page is focused on the 2006-2014 Savana 3500 TCM, it also fits the following models. Please verify your part number (24235754) or one of its interchanges (24242391, 24234503, 24252114, etc.) for a guaranteed match.
- GMC: Savana 1500/2500/3500 Van (06-14), Sierra 1500/2500, Yukon, Yukon XL, Envoy, Canyon
- Chevrolet: Express 1500/2500/3500 Van (06-14), Silverado 1500/2500, Tahoe, Suburban, Avalanche, Impala, Cobalt, HHR, Colorado
- Buick: LaCrosse, Lucerne, Allure, Rainier, Rendezvous
- Cadillac: DTS
- Pontiac: G5, G6, Grand Prix, Pursuit
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
What does VIN programming mean for me?
What does VIN programming mean for me?
It means the module arrives ready for installation right out of the box. We load it with the latest GM software specific to your vehicle’s VIN, so it works perfectly without needing any additional programming from a dealership. This saves you time and hundreds of dollars in dealer fees.
Will this fix a P0700 trouble code?
Yes. The P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, replacing a faulty TCM with this pre-programmed unit will resolve the underlying issue causing the P0700 code and other related transmission codes.
Where is this module located on my Savana 3500?
For the 2006-2014 GMC Savana and Chevrolet Express vans, the Transmission Control Module is located in the engine bay, mounted on the right-hand (passenger) side.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module or dispose of it, making the process simpler and hassle-free for you.
Is any special software needed after installation?
No special software is required. Because the unit is pre-programmed to your VIN, it’s designed for plug-and-play installation. We do recommend clearing any old codes with a standard OBD2 scan tool after the part is installed.