If your 2006-2014 GMC Savana 1500 work van is suddenly shifting erratically, getting stuck in gear, or throwing transmission codes, you know that every minute of downtime is costing you money. A faulty Transmission Control Module (TCM) is one of the most common culprits behind these frustrating and costly issues. This replacement T42 TCM, part number 24234503, is the reliable, straightforward solution to get your van back in service and running smoothly.
As a technician with over two decades of experience, I’ve seen countless GM trucks and vans come into the shop with what seems like a major transmission failure. More often than not, the root cause isn’t the hard parts inside the transmission—it’s the electronic brain that controls it. This module is the direct fix for those electrical gremlins, restoring precise command over your 4L60E, 4L65E, or 4L70E automatic transmission.
Case Study: A Tricky Diagnosis
A local contractor brought in his ’11 Savana 2500, a real workhorse. The complaint was intermittent—some days it shifted perfectly, others it would slam into gear or refuse to shift out of 2nd. He’d already been to another shop that couldn’t find the problem. After hooking up my scan tool, I saw a history of solenoid performance codes and a P0700 (Transmission Control System Malfunction). Instead of jumping to a costly transmission rebuild, we inspected the TCM. We found that the module was failing under heat soak. We replaced it with one of our VIN-programmed T42 modules, and the van was back on the road the same afternoon, shifting like new. It’s a classic example of how the right part can save thousands in unnecessary repairs.
Is Your Savana Van Showing These Symptoms?
A failing TCM can mimic a variety of other transmission problems. Before you consider a full rebuild, check if your vehicle is experiencing any of these common signs of a bad 2006-2014 Savana 1500 TCM:
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ The vehicle is stuck in “limp mode,” often in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750-P0758, or other solenoid-related faults.
- ✔ Inability to upshift or downshift properly, leading to poor acceleration.
- ✔ A noticeable decrease in fuel economy.
- ✔ The torque converter fails to lock up at highway speeds.
A Straightforward Guide to Installation
One of the biggest advantages of this module is its simple, plug-and-play installation. Because we program it to your van’s VIN before shipping, you can avoid a trip to the dealership for expensive programming. For most Savana and Express vans, the process takes less than 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On the 2006-2014 Savana 1500, you’ll find the TCM in the engine compartment, typically mounted on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug 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 and securely reconnect the electrical harnesses. Ensure they click into place.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few minutes. Use a basic OBD-II scan tool to clear any stored fault codes. Take the vehicle for a test drive to confirm that shifting has returned to normal.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24234503 and is interchangeable with many other GM service numbers. While it’s a perfect fit for the 2006-2014 Savana 1500 TCM, it also fits a wide range of other GM vehicles. Please verify your specific model and location below:
- GMC Savana / Chevrolet Express 1500/2500/3500 (2006-2014): Located in the RH engine compartment.
- Chevrolet Silverado / GMC Sierra 1500 (2007-2013): Located next to the battery (for new body style ’07).
- Chevrolet Tahoe / GMC Yukon (2007-2009): Located next to the battery.
- Chevrolet Impala / Monte Carlo (2006-2011): Found under the lower air cleaner housing.
- Pontiac G6 / Cobalt / HHR (2006-2011): Typically on or behind the LH strut tower.
- …and many more models from Buick, Cadillac, Saturn, Hummer, and Saab.
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. We handle all the programming for you. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for immediate installation, saving you time and money.
What is a core charge?
A core charge is a deposit you pay until you return your old part. We do not require a core charge for this TCM, so you can keep your old part without any hassle or extra cost.
Will this fix a P0700 code?
A P0700 is a generic code indicating the TCM has detected a fault. This module often resolves the underlying issue causing the P0700, especially when paired with solenoid or shifting performance codes. After installation, be sure to clear all codes.
How difficult is the installation for a DIYer?
This is a great DIY-friendly repair. If you can disconnect a battery and use a basic wrench, you can replace this module. The location is generally accessible in the engine bay, and no special tools are required.
What kind of warranty is included?
This Transmission Control Module comes with a one-year warranty, giving you peace of mind that you’re installing a quality, dependable part.