Is your 2006-2014 Chevrolet Express 1500 Van suffering from shifting problems, getting stuck in gear, or throwing transmission codes? As a technician with over two decades of experience, I know that a faulty Transmission Control Module (TCM) is one of the most common culprits behind these frustrating and costly issues. A failing TCM can bring your workhorse van to a standstill, impacting your business and your daily routine. This VIN-programmed T42 TCM, part number YNXS, is the definitive, reliable solution to get your van back on the road with confidence.
This isn’t just a replacement part; it’s a direct fix that arrives ready for installation. We pre-program the module to your van’s specific Vehicle Identification Number (VIN), which means you can skip the expensive trip to the dealership for programming. It’s designed to restore the precise, factory-level communication between your engine and the 4L60E or 4L65E transmission, ensuring smooth gear changes, correct torque converter lockup, and dependable performance.
Is Your Express Van Showing These Telltale Symptoms?
A failing TCM often displays clear warning signs. If you’re experiencing any of the following, it’s highly likely the module is the source of the problem. In my shop, nine out of ten vans with these issues trace back to a faulty TCM.
- ✔ Harsh, clunky, or erratic gear shifts that make driving uncomfortable.
- ✔ The vehicle is stuck in “limp mode,” often only allowing access to 2nd or 3rd gear.
- ✔ Your Check Engine Light is on with diagnostic trouble codes (DTCs) like P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel economy or the transmission overheating.
- ✔ Complete loss of communication with the transmission, preventing it from shifting at all.
A Technician’s Notebook: The Case of the Intermittent Fleet Van
I once had a fleet customer with a 2011 Express 1500 that had the most frustrating issue. The driver reported that some days it would shift perfectly, but on others, it would refuse to shift out of 2nd gear after making a delivery. They had already replaced two shift solenoids with no luck. When we got it in the bay, I saw no active codes, but the history showed a P0700. Experience told me this was likely heat-related internal failure in the TCM. We installed one of our pre-programmed T42 modules, and the van has been running without a single issue for over 50,000 miles. It’s a classic example of how a failing TCM can cause intermittent problems that seem impossible to diagnose.
Your Guide to a Fast and Simple Installation
One of the best features of this module is its straightforward installation. You don’t need a lift or specialized transmission tools. For the 2006-2014 Express 1500 TCM, the process is simple and can be done in your driveway in under 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On your Express Van, the TCM is typically found in the engine compartment on the right-hand (passenger) side. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the wiring harnesses from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses. You’ll hear a ‘click’ when they are properly seated.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s a good practice to use a basic OBD2 scan tool to clear any stored fault codes from the vehicle’s memory. Start the engine and take a test drive to confirm smooth shifting.
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. While this page focuses on the Express Van, it is also compatible with the following models. Please verify your specific model and year.
- Chevrolet Express 1500/2500/3500 Van (2006-2014): Transmission; (RH engine compartment)
- Chevrolet Silverado & GMC Sierra 1500/2500 (2007-2013): Transmission; (next to battery)
- Chevrolet Tahoe & GMC Yukon (2007-2009): Transmission; (next to battery)
- Chevrolet Impala (2006-2011): Transmission; (lower air cleaner housing)
- Chevrolet HHR (2006-2011): Transmission; (LH engine compartment)
- GMC Savana 1500/2500/3500 Van (2006-2014): Transmission; (RH engine compartment)
- Cadillac DTS (2006-2011): Transmission; (RH front engine compartment)
- …and many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. This module comes fully programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you the time and expense of a dealership visit.
What is the warranty on this part?
This transmission control module is backed by our standard one-year warranty, covering any defects in materials or workmanship for your peace of mind.
Is a core charge required for my old TCM?
No, there is no core charge. You can keep your old part or dispose of it without the hassle of returning a core.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request. While this TCM often resolves the underlying issue causing the P0700 (like a failed solenoid driver), you should ensure other potential causes have been ruled out. In most cases, a faulty TCM is the root problem.
How do I provide my VIN for programming?
You will be prompted to enter your vehicle’s 17-digit VIN during the checkout process. Please double-check it for accuracy to ensure correct programming.