Restore Peak Transmission Performance in Your GM Vehicle
Is your 2006-2014 Chevrolet Express 3500 suffering from harsh shifting, getting stuck in gear, or displaying a check engine light with transmission codes? These are classic signs of a failing Transmission Control Module (TCM). This genuine quality T42 TCM, service number 24239224, is the definitive solution to restore your vehicle’s smooth, reliable operation. As the electronic brain of your automatic transmission, the TCM governs everything from shift points to torque converter lockup. A faulty module can lead to poor performance, decreased fuel economy, and potential long-term damage to your transmission.
From the Diagnostic Bay
We had a 2011 Savana 2500 (a sister vehicle to the Express) come into the shop with a persistent P0752 code for a stuck-on shift solenoid. The owner had already replaced the solenoid twice with no luck. The transmission would shift hard from first to second and sometimes get stuck in third gear. Instead of tearing into the transmission again, we hooked up our scanner and monitored the command signals from the TCM. We saw the module was commanding the solenoid on when it shouldn’t have been. We installed a VIN-programmed T42 module, cleared the codes, and the van shifted perfectly. It’s a common scenario where the driver board inside the TCM fails, leading mechanics to chase phantom solenoid or wiring issues. Replacing the module first saved hours of unnecessary labor and diagnostics.
Is Your Vehicle Showing Signs of a Failing TCM?
- ✔ Harsh, erratic, or delayed gear shifts that disrupt your drive.
- ✔ Vehicle enters “limp mode,” often stuck in 2nd or 3rd gear, with severely limited power.
- ✔ The Check Engine Light or Transmission Warning Light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift, making driving unpredictable and unsafe.
- ✔ A noticeable drop in fuel efficiency as the transmission operates inefficiently.
The Superior Solution: A Pre-Programmed Express 3500 Transmission Module
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The primary benefit is our complimentary VIN programming service. When you order, we flash the module with your vehicle’s specific Vehicle Identification Number and the latest GM software updates. This critical step ensures that the new Express 3500 Transmission Module communicates flawlessly with your vehicle’s Engine Control Module (ECM) and other systems right out of the box. You can bypass the expensive and time-consuming trip to a dealership for programming. Simply install the module, and you’re ready to go.
Simple, Direct Installation
Designed for a straightforward installation, this TCM can be replaced in under 30 minutes with basic hand tools. On the Chevrolet Express and GMC Savana vans, the module is conveniently located in the engine compartment on the right-hand (passenger) side. For a smooth installation, always disconnect the vehicle’s battery before you begin. This helps reset the vehicle’s electronic systems. After installing the new module and reconnecting the battery, use a standard OBD2 scan tool to clear any stored transmission codes. With no core charge, you don’t have to worry about the hassle and expense of returning your old part.
Broad Compatibility Across the GM Lineup
While this is the perfect fit for your 2006-2014 Express 3500, this T42 TCM is also compatible with a wide array of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is a direct replacement for numerous part numbers, including 24252114, 24234503, 24230461, 24239224, and more. Whether you’re working on a Chevrolet Silverado, GMC Sierra, Buick LaCrosse, or Hummer H3, this module provides the same level of quality and reliability. Trust in a part built to meet and exceed original equipment standards, backed by a one-year warranty for your peace of mind.
Frequently Asked Questions
What does a T42 Transmission Control Module do?
The T42 TCM is a small computer that acts as the brain for your automatic transmission. It receives data from various sensors on the engine and transmission to control shift solenoids, regulate line pressure, and manage torque converter clutch engagement, ensuring smooth and efficient gear changes.
Is this module truly plug-and-play?
Yes. Because we pre-program the module to your vehicle’s specific VIN before shipping, it is ready for installation right out of the box. This process eliminates the need for any additional programming or setup at a dealership, saving you time and money.
Where is the TCM located on my 2006-2014 Express 3500?
On the Express and Savana vans from this era, the transmission control module is typically found in the engine compartment, mounted on the right-hand (passenger) side. Always confirm the location before beginning work.
Will this Express 3500 Transmission Module fix a P0700 code?
A P0700 code is a general fault code indicating the TCM has detected a problem and has requested the check engine light be turned on. While the P0700 itself doesn’t pinpoint the TCM as the failure, it is very often present when the TCM has failed and set other specific codes. Replacing a faulty TCM will resolve the underlying issue causing the P0700 code.
What happens if I continue driving with a bad TCM?
Continuing to operate a vehicle with a failing TCM can lead to more severe problems. Poor shifting can cause excessive wear on clutches and bands inside the transmission, potentially leading to a complete transmission failure that is far more expensive to repair.