Restore Smooth Shifting to Your Workhorse Van
Is your 2006-2014 Chevrolet Express 1500 van suffering from erratic shifting, getting stuck in gear, or throwing transmission codes? A faulty Transmission Control Module (TCM) is one of the most common culprits behind these frustrating and costly issues. As a shop owner, I’ve seen firsthand how a failing TCM can sideline a work van, impacting schedules and profits. This replacement T42 TCM, part number 24240449, is the reliable, no-hassle solution to get your vehicle’s automatic transmission performing like new again.
This isn’t just a part; it’s a complete fix. We pre-program the module to your van’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures it communicates flawlessly with your vehicle’s Engine Control Module (ECM) and other systems right out of the box. You get to skip the expensive trip to the dealership for programming, saving you both time and money. This module directly manages shift points, torque converter clutch engagement, and line pressure, restoring the dependable performance you rely on for every job.
Case Study: The Slipping Fleet Van
A local delivery company brought in a 2011 Express 2500 with 150,000 miles. The driver reported harsh 1-2 shifts and occasional failure to upshift, forcing him to pull over and restart the van. The check engine light was on, and my scan tool pulled a P0700 (Transmission Control System Malfunction) and a P0751 (Shift Solenoid ‘A’ Performance/Stuck Off). While the solenoid code pointed to a specific component, my experience with these 4L60E/4L80E transmissions told me to check the source. After verifying the wiring harness was intact, we swapped in a VIN-programmed TCM. The problem was solved instantly. The original module’s internal drivers for the solenoids had failed—a common issue I’ve diagnosed on dozens of these GM work vans. This simple swap saved them from an unnecessary and expensive transmission teardown.
Diagnosing a Faulty 2006-2014 Express 1500 TCM
Transmission problems can be tricky, but a failing TCM often leaves a clear trail of evidence. If you’re experiencing multiple electronic symptoms simultaneously, the module itself is a prime suspect. It acts as the brain for the transmission, and when it malfunctions, the entire system can become unpredictable. This replacement is engineered to OEM specifications to permanently resolve those communication errors and restore full functionality.
Is Your Express Van Showing These Red Flags?
- ✔ Erratic, delayed, or harsh gear shifts that slam into gear.
- ✔ The vehicle is stuck in a single gear (often called ‘limp mode’), usually 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0751, P0756, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel economy due to inefficient shifting.
- ✔ The transmission seems to slip out of gear or fails to engage from Park.
Quick & Easy TCM Installation Guide
For the Chevrolet Express and GMC Savana vans, this is a straightforward repair that most DIYers can complete in under 30 minutes with basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the onboard systems.
- Locate the TCM: On the 2006-2014 Express and Savana vans, the TCM is typically mounted in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Press the release tabs firmly to avoid damaging them. 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 connectors. You should hear a ‘click’ as they lock in.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and let it idle for a few minutes. While our programming clears most faults, it’s good practice to use a basic OBD2 scan tool to clear any remaining stored codes. No core charge means you can simply dispose of your old part.
Confirmed Vehicle Compatibility List
This T42 TCM is a direct fit for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions (like the 4L60E, 4L65E, 4L70E, and 4L80E). While this page focuses on the Express van, it is also compatible with the following models. Please verify your specific model and year.
- Chevrolet: Express 1500/2500/3500 (06-14), Silverado (07-13), Tahoe (07-09), Impala (06-11), Cobalt (06-10), HHR (06-11), and more.
- GMC: Savana 1500/2500/3500 (06-14), Sierra (07-13), Yukon (07-09), Canyon (08-12), Envoy (06-09).
- Buick: LaCrosse (06-09), Lucerne (06-11), Allure (06-09).
- Cadillac: DTS (06-11).
- Pontiac: G6 (06-10), Grand Prix (06-08).
- And others including: Hummer H3, Saturn Vue, Saab 9-7X.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit VIN into the module before shipping. This ensures the TCM has the correct software and calibration for your specific engine, transmission, and options, allowing it to work perfectly upon installation without needing a trip to a dealer.
Will this fix a P0700 trouble code on my Express van?
A P0700 code is a general fault code indicating the TCM has detected a problem. This module often resolves the root cause, especially if other solenoid or communication codes are present. However, you should always ensure the wiring and the transmission itself are in good health.
Do I need any special tools for this installation?
No special tools are required. A basic socket set to remove the mounting bolts and your hands to undo the electrical connectors are typically all you need. The entire process should take less than 30 minutes.
Is there a core charge for my old part?
No, we do not require you to send back your old, faulty module. There is no core charge, which simplifies the process for you.
What if I have a different part number on my original module?
This module, 24240449, is interchangeable with many other GM service numbers like 24252114, 24234503, and 24256960. Our programming ensures it functions correctly as a replacement for any of the compatible part numbers listed in the product details.