Restore Your Van’s Shifting Performance and Reliability
As a professional who has spent decades with my hands on engines and transmissions, I know that for a workhorse like the 2006-2014 GMC Savana 2500 Van, downtime is not an option. When the transmission starts acting up—hesitating, shifting hard, or going into limp mode—your business grinds to a halt. The culprit is often a failing Transmission Control Module (TCM), the electronic brain that manages every gear change. This T42 TCM, part number 24240400, is the definitive solution, arriving at your door fully programmed to your van’s specific VIN. This means no expensive trip to the dealership for programming; it’s a true plug-and-play fix that gets you back on the road and back to work.
Case Study: A Tricky Diagnosis
I remember a local plumber bringing in his ’08 Savana 2500. He was losing jobs because his van would intermittently get stuck in 3rd gear, especially on hot days after a long drive. He’d already replaced a shift solenoid with no luck. A quick scan showed a P0700 (Transmission Control System Malfunction) and some intermittent solenoid circuit codes. Experience told me this wasn’t a mechanical issue; it was electronic. The original TCM was failing under heat soak. We installed one of our VIN-programmed T42 modules, and he was back in business the same afternoon. No more lost jobs, no more unpredictable limp mode. That’s the peace of mind this part provides.
Is Your Savana Van Showing These Symptoms?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your 2006-2014 Savana 2500 TCM needs replacement. In my shop, these are the classic signs I look for:
- âś” Harsh, erratic, or delayed gear shifts that slam you forward.
- âś” The vehicle is stuck in a single gear (often called ‘limp mode’) and won’t shift up or down.
- âś” Check Engine Light or Transmission Warning Light is illuminated on the dash.
- âś” Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750, or other transmission-related codes.
- âś” A noticeable drop in fuel economy as the transmission operates inefficiently.
- âś” Complete loss of communication with the module, leading to a no-start or no-shift condition.
A Straightforward Guide to Installation
One of the biggest benefits of this module is its simple installation. You don’t need a professional lift or specialized equipment. For most Savana and Express vans, the process takes less than 30 minutes.
- Safety First: Always disconnect the negative terminal on your vehicle’s battery before starting any electronic work. This prevents electrical shorts and helps reset the vehicle’s systems.
- Locate the Module: On the Savana/Express platform, the TCM is typically located in the engine compartment on the right-hand (passenger) side, mounted near the firewall or inner fender.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs, so be gentle. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Reconnect the electrical harnesses securely, ensuring they click into place.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and check for smooth shifting and ensure no warning lights are present. While not always necessary, using a basic scan tool to clear any stored historical codes is good practice.
Verified Vehicle Compatibility
This T42 Transmission Control 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 focuses on the 2006-2014 Savana 2500 TCM, it is also compatible with the following models. Please verify the location noted for your specific vehicle.
- GMC Savana / Chevrolet Express (1500, 2500, 3500): 2006-2014 (RH engine compartment)
- GMC Sierra / Chevrolet Silverado (1500, 2500): 2007-2013 (Varies, often next to battery)
- GMC Yukon / Chevrolet Tahoe / Suburban: 2007-2009 (Next to battery)
- Cadillac DTS: 2006-2011 (RH front engine compartment)
- Chevrolet Impala: 2006-2011 (Lower air cleaner housing)
- Hummer H3: 2008-2010 (RH rear engine compartment)
- Chevrolet Cobalt & HHR: 2006-2011 (LH engine compartment/strut tower)
- And many more Buick, Pontiac, and Saturn models. This part interchanges with numbers including: 24252114, 24234503, 24230461, 24234274, 24240400, 24256960, and YNXS.
Frequently Asked Questions
Do I need to take my van to the dealer after installing this?
No. This Transmission Control Module comes pre-programmed to your vehicle’s VIN. This eliminates the need for any additional programming or calibration. It’s designed to be a plug-and-play solution.
What is the difference between a TCM and a PCM?
The TCM (Transmission Control Module) specifically controls the automatic transmission’s functions, like shifting. The PCM (Powertrain Control Module) is the main computer that controls both the engine and, in some vehicles, the transmission. On these GM models, the TCM is a separate, dedicated unit.
Is there a core charge for my old part?
No, there is no core charge required for this part. You can keep your old module or dispose of it without the hassle of sending it back.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other issues like bad solenoids or wiring. However, if you’re also experiencing symptoms like limp mode or erratic shifting, replacing the TCM is the most likely fix.
How long does the warranty last?
This module is backed by our one-year warranty, giving you confidence in the quality and reliability of your repair.