Restore Your Van’s Shifting Performance
As a technician with over two decades of experience, I know that when a workhorse like your 2006-2014 GMC Savana 2500 Van is down, every minute counts. Erratic shifting, getting stuck in gear, or a glowing check engine light isn’t just an annoyance—it’s costing you time and money. The Transmission Control Module (TCM), the electronic brain of your automatic transmission, is a common point of failure. This T42 TCM, part number 24255280, is the definitive, reliable solution to get your van back on the road and working as hard as you do.
This isn’t just a replacement part; it’s a complete fix. We pre-program each module to your van’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures seamless communication with your vehicle’s other computers, like the Engine Control Module (ECM), and restores the precise shift logic and torque converter operation intended by the factory. You get to skip the expensive and time-consuming trip to the dealership for programming—this module is truly plug-and-play.
Case Study: A Tricky Diagnosis
I remember a 2011 Savana 2500 that came into my shop. The owner, a plumber, said it would randomly refuse to shift out of 2nd gear, but only after it was fully warmed up. There were no consistent trouble codes, just a generic P0700 (Transmission Control System Malfunction) that would pop up now and then. We checked the fluid, solenoids, and wiring harness—all looked fine. The intermittent nature of the problem pointed straight to an electronic failure. After swapping in a pre-programmed T42 TCM, the problem vanished instantly. The original module’s internal circuits were failing under heat, a classic symptom I’ve seen hundreds of times. This simple swap saved him from a potential transmission rebuild and got his business moving again.
Is Your Savana’s Transmission Showing These Signs?
A faulty TCM can cause a wide range of problems that are often misdiagnosed as major mechanical failures. Before you consider a costly transmission replacement, check if you’re experiencing any of these common symptoms associated with a failing 2006-2014 Savana 2500 TCM:
- ✔ Harsh, clunky, or delayed gear shifts.
- ✔ The vehicle is stuck in “limp mode” (usually second or third gear).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) stored, such as P0700, P0750-P0758 (solenoid circuit faults), or communication errors.
- ✔ Inability to upshift or downshift properly.
- ✔ A noticeable drop in fuel economy.
- ✔ The torque converter fails to lock up at highway speeds, causing high RPMs.
A Straightforward Guide to Installation
One of the best features of this VIN-programmed module is its simple installation. You don’t need to be a master mechanic to get this job done in your driveway in under 30 minutes. Here’s a quick guide for your GMC Savana:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and to help reset the onboard systems.
- Locate the TCM: On the 2006-2014 Savana Van, the TCM is typically found in the engine compartment, mounted on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unclip the electrical connectors from the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely plug in the electrical connectors—they will only fit one way. Ensure they click into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle. While our programming resolves most codes, it’s good practice to use a basic OBD2 scan tool to clear any remaining stored DTCs from the system.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24255280 and is compatible with 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 2500 TCM, it also fits the following models. Please verify your specific model and part number.
- GMC: Savana 1500/2500/3500 Van (06-14), Sierra 1500/2500, Yukon, Envoy, Canyon
- Chevrolet: Express 1500/2500/3500 Van (06-14), Silverado 1500/2500, Tahoe, Suburban, 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
This part is interchangeable with service numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24240400, 24256960 and more.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for plug-and-play installation, saving you hundreds in dealership fees.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old part or dispose of it without the hassle of returning it.
What kind of warranty is included?
This module comes with a one-year, no-hassle warranty, giving you peace of mind and confidence in your repair.
Will this fix a P0700 trouble code?
A P0700 code is a general code indicating the TCM has detected a fault. While a failing TCM is a very common cause, this code can also be triggered by other issues. However, if you’re also experiencing shifting problems, replacing the TCM is the most likely solution.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure correct programming.