End Transmission Headaches in Your 2006-2014 Chevy Express 3500
If your workhorse Chevrolet Express 3500 Van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, a failing Transmission Control Module (TCM) is the likely culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can bring a reliable work van to a grinding halt, costing you time and money. This replacement T42 TCM, part number 24240449, is the definitive solution to restore your transmission’s performance and get you back on the road with confidence.
The TCM is the brain of your automatic transmission, controlling everything from shift points to torque converter lockup. When it fails, communication between the engine and transmission breaks down, leading to the frustrating symptoms you’re experiencing. Our module is meticulously prepared and programmed to your van’s specific Vehicle Identification Number (VIN), ensuring it works perfectly right out of the box. This eliminates the need for expensive dealership programming, making it a smart, cost-effective repair for both professional mechanics and savvy DIYers.
Case Study: The Intermittent Limp Mode Nightmare
A local contractor brought his 2011 Express 3500 into my shop. The van would randomly drop into limp mode (stuck in 3rd gear) with a P0700 code, but only after it was fully warmed up on hot days. He’d already replaced two shift solenoids at another shop with no success. After hooking up my scan tool and monitoring live data, I noticed the TCM was intermittently dropping communication. Heat soak was causing an internal failure. We installed one of our VIN-programmed T42 modules, and the problem was solved permanently. This is a classic failure pattern for the Express 3500 Van TCM, and a direct replacement is the only reliable fix.
Is Your Express Van Showing These Telltale Signs?
A bad TCM can manifest in several ways. If you’re noticing any of the following, it’s time to consider a replacement:
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults are present.
- ✔ Unexplained poor fuel mileage or a feeling of sluggish performance.
- ✔ Complete loss of communication with the transmission module (no-start or no-shift condition).
A Straightforward Guide to Installation
Replacing the Express 3500 Van TCM is a job most people can handle in their own driveway in under 30 minutes. Our pre-programming makes it a true plug-and-play process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On the Express and Savana vans, the TCM is typically found in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly to avoid breaking them. Then, unbolt the old module from its mounting bracket.
- Install the New Module: Bolt the new, programmed TCM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock in.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a minute. While the module is pre-programmed, it’s good practice to use a basic scan tool to clear any stored fault codes from the ECU.
Verified Fitment For Your General Motors Vehicle
This T42 TCM is a direct replacement for part number 24240449 and is interchangeable with service numbers like 24252114, 24234503, and others. It is guaranteed to fit the following models:
- Chevrolet Express 1500/2500/3500 Van (2006-2014)
- GMC Savana 1500/2500/3500 Van (2006-2014)
- Chevrolet Silverado & GMC Sierra (Check specific years/engines)
- Chevrolet Tahoe & GMC Yukon (Check specific years)
- Buick LaCrosse, Lucerne, Allure
- Cadillac DTS
- Pontiac G6, Grand Prix
- And many other GM vehicles from 2006-2014. Please verify your part number or contact us with your VIN to confirm compatibility.
Frequently Asked Questions
Frequently Asked Questions
What is VIN programming and why do I need it?
VIN programming loads your vehicle’s specific software and calibration files onto the module. This ensures it communicates correctly with your engine and other systems for optimal shift quality and performance, avoiding the need for a dealer visit.
Is this a new or used part?
This is an OEM-quality replacement module that has been expertly prepared and programmed to meet or exceed original factory specifications. It comes with a one-year warranty for your peace of mind.
Do I need to send my old TCM back?
No, there is no core charge for this part. You can keep or dispose of your old module, making the process hassle-free.
Will this fix my P0700 trouble code?
A P0700 code is a general fault request from the TCM. While a faulty Express 3500 Van TCM is a very common cause, you should always diagnose the specific codes stored within the TCM itself (like solenoid or sensor codes) to confirm the failure. This part is designed to resolve internal module faults that trigger these codes.
Can I install this myself?
Absolutely. The installation is straightforward and requires only basic hand tools. Because it arrives pre-programmed, no special electronic tools or software are needed to get your van running properly again.