Get Your Work Van Back on the Road with a Reliable, Programmed TCM
If your 2006-2014 Chevrolet Express 3500 Van is suffering from harsh shifting, getting stuck in gear, or throwing transmission codes, the culprit is often a failing Transmission Control Module (TCM). As the brain of your automatic transmission, a faulty TCM can bring your work to a halt. This T42 series module, part number 24235754, is the definitive solution, arriving pre-programmed to your van’s specific VIN. This means no expensive trips to the dealership for programming—it’s a true plug-and-play fix that restores the crisp, reliable shifting you depend on.
Case Study: A Tricky Diagnosis
I remember a 2011 Express 3500 from a local plumbing company that came into my shop. The driver reported intermittent, violent 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode), but only after the van was fully warmed up. They had already replaced two shift solenoids at another shop with no success. We scanned it and found a generic P0700 code. Instead of just throwing more parts at it, we monitored the TCM data stream. We saw erratic solenoid command signals that didn’t match the driving conditions. This pointed directly to a logic failure within the TCM itself, a common issue caused by heat cycles and vibration. We installed a VIN-programmed T42 module, and the problem was solved instantly. The customer was back on the job the same afternoon, a testament to how a correct diagnosis and a pre-programmed part saves time and money.
Is Your Express Van Showing These Signs?
- ✔ Unpredictable or harsh gear shifts, especially when cold or hot.
- ✔ The vehicle is stuck in limp mode, usually only allowing 2nd or 3rd gear.
- ✔ Check Engine Light is on with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, or other solenoid circuit faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel economy or the transmission running hotter than normal.
- ✔ Complete loss of communication with the TCM, preventing shifting altogether.
Simple Installation Guide: Get Your Van Back to Work
For the Chevy Express and GMC Savana vans, this is one of the more straightforward electronic repairs you can perform. You’ll have your vehicle running smoothly in under 30 minutes.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the TCM: On the 2006-2014 Express 3500 Van, the TCM is typically located in the engine compartment on the right-hand (passenger) side, often near the firewall or main fuse block.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical harnesses, ensuring they click securely into position.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. While not always necessary, using a basic scan tool to clear any stored fault codes is good practice.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page focuses on the Express 3500 Transmission Module, it is also confirmed to fit models such as:
- ✔ Chevrolet Silverado & GMC Sierra (1500, 2500)
- ✔ Chevrolet Tahoe & GMC Yukon
- ✔ Chevrolet Express & GMC Savana (1500, 2500, 3500)
- ✔ Chevrolet Impala, Cobalt, HHR
- ✔ Cadillac DTS, Buick Lucerne
- ✔ Hummer H3, Saab 9-7X
- ✔ And many more models listed in the fitment data. This module is interchangeable with part numbers 24252114, 24234503, 24235754, and others.
Frequently Asked Questions
Frequently Asked Questions
What does “VIN Programmed” mean for me?
It means we flash the module with your vehicle’s unique Vehicle Identification Number (VIN) and the latest GM software before we ship it. This ensures it communicates perfectly with your van’s other computers (like the ECM) right out of the box, eliminating the need for expensive dealership programming.
Is this a difficult part to install myself?
No, this is a great DIY-friendly repair. The module is easily accessible in the engine bay, and the replacement requires only basic hand tools. Our installation guide above walks you through the simple process.
Will this fix a P0700 trouble code?
A P0700 code means the TCM has detected a fault and has requested the Check Engine Light to be turned on. While this module often resolves the underlying cause (like a solenoid circuit fault originating in the TCM), you should confirm there are no external wiring or solenoid issues first. In many cases, a faulty TCM is the root cause.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep your old module or dispose of it, making the transaction simple and hassle-free.
How do I know this is the right part for my van?
This module, service number 24235754, is the correct T42 module for 2006-2014 Express 3500 vans. By providing your VIN at checkout, we guarantee it will be programmed for a perfect match to your specific vehicle configuration.