If your Chevrolet Express Van is the backbone of your business or your daily workhorse, you can’t afford the downtime caused by a failing transmission control module. When you experience erratic shifting, a check engine light, or the van getting stuck in gear, it’s often the TCM that’s the culprit. This VIN-programmed T42 Transmission Control Module (TCM), part number 24240449, is the direct, reliable solution to get your 2006-2014 Express 1500 Van back on the road and running smoothly.
As the electronic brain of your automatic transmission (like the 4L60E, 4L65E, or 4L80E), the TCM manages every gear change, controls torque converter lockup, and monitors system health. When it fails, it can mimic a major mechanical transmission problem, leading to costly and incorrect diagnostics. This module is pre-programmed to your van’s specific Vehicle Identification Number (VIN), ensuring it works perfectly right out of the box without any expensive trips to the dealership for programming.
A Technician’s Notebook
I once had a fleet customer bring in three different Express 2500 vans over two months, all with the same complaint: intermittent, harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode) after a long day of deliveries. The first van had its transmission rebuilt at another shop, but the problem returned. After scanning, I found no hard solenoid codes, just a generic P0700. Experience has taught me that on these work vans, the constant heat cycles and vibration in the engine bay are brutal on electronics. We swapped the original TCM with one of our VIN-programmed units on all three vans. The shifting problems vanished instantly. It’s a classic case where the electronic failure mimics a hydraulic or mechanical one, and this module is the precise fix.
Key Signs Your Express Van’s TCM is Failing
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ Vehicle is stuck in a single gear (often called ‘limp mode’).
- ✔ The Check Engine Light or Transmission Warning Light is on, often with Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ A complete loss of communication with the TCM, preventing diagnostics.
- ✔ The transmission feels like it’s slipping between gears.
Straightforward Guide to Your 2006-2014 Express 1500 TCM Installation
Installing your new TCM is a simple job that most DIYers can complete in their own driveway. For the Express and Savana vans, the location is consistent and easy to access.
- 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 your Express Van, the TCM is typically mounted in the engine compartment on the right-hand (passenger) side. Look for a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harness connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new VIN-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 few minutes. While our programming clears most faults, it’s good practice to use a basic OBD2 scanner to clear any lingering codes from the ECU.
Confirmed Vehicle Compatibility
This module is a direct replacement for part number 24240449 and other service numbers on a wide range of GM vehicles. While this page focuses on the 2006-2014 Express 1500 TCM, it also fits the following models. Always verify by part number or contact us with your VIN.
- Chevrolet: Express/Savana 1500/2500/3500 (06-14), Silverado (07-13), Tahoe (07-09), Impala (06-11), Cobalt (06-10), HHR (06-11), Colorado (08-12)
- GMC: 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)
- Saturn: Vue (07-10), Aura (07-09), Ion (06-07)
- Hummer: H3 (08-10)
- Saab: 9-7X (06-09)
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s specific 17-digit VIN into the module before shipping. This ensures the TCM has the correct software and calibration for your van’s engine, transmission, and options, making it a true plug-and-play part with no further dealer programming needed.
Do I need any special tools for this installation?
No, basic hand tools are all you need. A simple socket set to remove the mounting bolts and your hands to disconnect the electrical plugs are typically sufficient. An OBD2 scanner is recommended to clear any stored codes post-installation, but is not always required.
Is there a core charge for my old TCM?
No, we do not require you to send your old part back. There is no core charge, saving you the time and hassle of return shipping.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECU) to turn on the check engine light. While this module often resolves the underlying issue causing the P0700 (like a failed solenoid driver), you should always diagnose any other codes that are present alongside it.
How do I provide my VIN?
You can enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure perfect programming.