Fix Your Van’s Transmission Problems for Good
If your 2006-2014 Chevrolet Express 1500 Van is suffering from unpredictable shifting, getting stuck in gear, or has the check engine light on, you’re likely dealing with a failed Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline a perfectly good work van. This isn’t just an annoyance; it’s a reliability issue that can cost you time and money. This T42 TCM, part number 24243921, is the definitive, hassle-free solution to restore your transmission’s performance and get you back on the road with confidence.
The core of the problem with these modules often stems from internal electronic failure due to heat cycles and vibration, leading to communication errors with the transmission’s solenoids and sensors. Our module is the direct answer. We pre-program it to your van’s specific Vehicle Identification Number (VIN) before it ships. This means you can skip the expensive dealership visit for programming. It arrives ready for a true plug-and-play installation, immediately restoring precise gear changes, proper torque converter lockup, and reliable communication.
Case Study: A Tricky Diagnosis
I remember a 2011 Express 1500 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 solenoid codes, just a generic P0700 (TCM Fault). We checked the wiring and fluid, which were fine. The intermittent nature of the problem pointed directly to the TCM’s processor failing under heat. We installed a VIN-programmed T42 module, and the problem was solved instantly. It’s a classic failure pattern for these vehicles, and this part is the reliable fix.
Is Your Express Van Showing These Symptoms?
- ✔️ Harsh, slamming shifts or delayed gear engagement.
- ✔️ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔️ Check Engine Light or Transmission Warning Light is illuminated.
- ✔️ Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other solenoid-related faults are present.
- ✔️ The transmission refuses to upshift or downshift correctly.
- ✔️ A noticeable drop in fuel economy or signs of the transmission overheating.
- ✔️ Complete loss of communication with the transmission module.
Your 30-Minute Path to Smooth Shifting
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- ✔ Locate the Module: On the Express Van, the TCM is typically found in the engine compartment on the right-hand (passenger) side.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. Use a small screwdriver to gently release the locking tabs if necessary. Then, unbolt the old module from its mounting bracket.
- ✔ Install the New TCM: Bolt the new, pre-programmed module into place and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock in.
- ✔ Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes. Start the vehicle and enjoy restored shifting performance.
Verified Vehicle Compatibility
This T42 TCM is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions (like the 4L60E, 4L65E, and 4L70E). While this page is focused on the 2006-2014 Express 1500 TCM, it is also compatible with the following models. Always verify your part number for a perfect match. This part is interchangeable with service numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, and others.
- Chevrolet Express / GMC Savana (1500, 2500, 3500) 2006-2014
- Chevrolet Silverado / GMC Sierra 1500 2007-2013
- Chevrolet Tahoe / GMC Yukon 2007-2009
- Chevrolet Suburban / GMC Yukon XL 1500 2007-2008
- Chevrolet Impala 2006-2011
- Cadillac DTS 2006-2011
- Buick Lucerne 2006-2011
- And many more GM models from 2006-2014.
Frequently Asked Questions
Do I need to take my van to the dealer after installation?
No. This module is delivered to you fully programmed to your vehicle’s VIN. The programming is done before we ship, so you can install it yourself and it will work immediately without requiring any additional dealer tools or fees.
What if my old part number isn’t an exact match to 24243921?
GM uses many different service numbers for the same part. Our T42 TCM is interchangeable with a long list of part numbers, including 24252114, 24234503, and many others listed in the description. As long as your vehicle is listed in our fitment guide, this module will work.
Is this installation difficult for a DIYer?
Not at all. This is one of the more straightforward electronic component replacements. It’s typically held on by a few bolts and has simple plug-in connectors. With basic hand tools, most people can complete the job in under 30 minutes.
What is a “core charge” and do you require one?
A core charge is a deposit you pay until you return your old, faulty part. We do not have a core charge on this item, so you can keep your old part without any hassle or need to ship it back.