Restore Flawless Shifting to Your GM Vehicle
If your 2006-2014 Savana 1500 Van is suffering from erratic shifting, getting stuck in gear, or has an illuminated check engine light, a failing Transmission Control Module (TCM) is the most likely culprit. This T42 TCM, also known by part numbers like 24235754 and 24252114, is the definitive solution. As the electronic brain of your automatic transmission, it governs every gear change, manages torque converter clutch engagement, and monitors system health. We take the guesswork and high dealership costs out of the repair by programming this module to your vehicle’s specific VIN before shipping. This ensures it works perfectly right out of the box, restoring the smooth, reliable performance you depend on.
A Technician’s Notebook
I’ve seen countless work vans, especially the Savana and Express models, come into my shop with what seems like a catastrophic transmission failure. The driver reports sudden, harsh bangs when shifting or the van refusing to shift past 2nd gear (limp mode). Nine times out of ten, after pulling a P0700 (Transmission Control System Malfunction) or a specific solenoid code, the issue traces back to this T42 module. The location in the engine bay exposes it to years of heat cycles and vibration, which eventually degrades the internal circuits. Replacing it with a pre-programmed unit like this one is the most efficient repair, getting a vital work vehicle back in service the same day without a costly trip to the dealer for software flashing.
Is Your Savana Van Exhibiting These Transmission Faults?
A faulty TCM can manifest in various ways, often mimicking internal transmission damage. Before condemning your transmission, check for these common electronic symptoms:
- ✔ Unpredictable, hard, or delayed gear shifts.
- ✔ The vehicle is stuck in a single gear (often called “limp mode” or “fail-safe mode”).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ A complete loss of communication with the transmission module.
- ✔ Poor acceleration and a noticeable drop in fuel economy.
Straightforward 30-Minute Installation Guide
Installing your new 2006-2014 Savana 1500 TCM is a simple process that most DIYers can complete with basic hand tools. Because it arrives pre-programmed, no special electronic tools are needed.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: On most Savana and Express vans, the TCM is located in the engine compartment on the right-hand (passenger) side, mounted near the inner fender.
- Disconnect and Remove: Carefully unclip the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Mount the new, programmed TCM onto the bracket and securely re-attach the electrical connectors. You should hear a click as they lock into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. 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 Fitment For These GM Models
This T42 TCM is engineered for a direct fit on a wide array 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 1500 TCM, it also fits the following models. Please verify the location noted for your specific vehicle:
- Chevrolet: Silverado, Tahoe, Suburban, Avalanche, Express, Colorado, Cobalt, HHR, Impala, Monte Carlo
- GMC: Sierra, Yukon, Savana, Canyon, Envoy
- Buick: LaCrosse, Lucerne, Rainier, Rendezvous
- Pontiac: G5, G6, Grand Prix, Pursuit
- Cadillac: DTS
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
This part is interchangeable with service numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, and many more.
Frequently Asked Questions
What is the main benefit of a VIN-programmed TCM?
VIN programming loads your vehicle’s exact software and calibration files onto the module before it ships. This makes the installation truly plug-and-play, eliminating the need for an expensive and time-consuming programming session at a dealership.
Will this fix my transmission that is stuck in 3rd gear?
Yes, being stuck in one gear (limp mode) is a classic symptom of a failed TCM. This programmed module is designed to resolve that exact issue by restoring proper communication and control over the transmission’s solenoids.
Do I need to return my old TCM? Is there a core charge?
No, there is absolutely no core charge. You can keep your old part, which saves you the time, money, and hassle of packaging and shipping it back.
Where is the TCM located on a 2008 GMC Savana 1500?
On the 2006-2014 Savana and Express vans, the Transmission Control Module is typically found in the engine compartment, mounted to the inner fender on the right-hand (passenger) side.
What kind of warranty comes with this part?
This module is backed by our one-year, hassle-free warranty, giving you confidence and peace of mind in your repair.