Is Your Chevy Express Van Shifting Erratically or Stuck in Gear?
If your 2006-2014 Chevrolet Express 1500 is experiencing harsh shifting, delayed gear engagement, or is stuck in limp mode, a failing Transmission Control Module (TCM) is the most likely culprit. As the electronic brain of your 4L60E or 4L65E transmission, the T42 TCM governs every shift, torque converter lockup, and diagnostic check. When it fails, it can bring your work van or family hauler to a standstill, often illuminating the check engine light with codes like P0700.
This replacement T42 TCM, part number 24235754, is the definitive solution. We pre-program it to your van’s specific Vehicle Identification Number (VIN) before shipping, ensuring it arrives ready for a true plug-and-play installation. No expensive trips to the dealership for programming are necessary. Get your Express back on the road with smooth, reliable shifting.
Diagnosing a Faulty GM T42 TCM
From my 20+ years in the shop, these are the classic signs of a TCM on its way out. If your Express exhibits any of these, it’s time for a replacement:
- โ Harsh, slamming shifts or erratic gear hunting.
- โ The vehicle is stuck in a single gear (limp mode), usually 2nd or 3rd.
- โ Check Engine Light or Transmission Warning Light is on.
- โ Diagnostic Trouble Codes (DTCs) are present, especially P0700, P0750-series solenoid codes, or communication errors.
- โ Delayed engagement when shifting from Park to Drive or Reverse.
- โ Poor fuel economy and a feeling of sluggish performance.
A Real-World Scenario from My Shop
A customer brought in his 2011 Express 1500 work van that was stuck in 3rd gear. He was a contractor and losing money every day the van was down. His scanner showed a P0700 and a solenoid performance code. Before jumping to a costly transmission rebuild, we checked the basics. The fluid was clean, and the wiring harness looked good. The symptoms pointed directly to the internal logic of the TCM. We installed one of our VIN-programmed T42 modules, cleared the codes, and had him back on the road in under an hour. It’s a common, straightforward fix that saves immense time and money.
Why Choose Our 2006-2014 Express 1500 TCM?
This isn’t just a part; it’s a complete, ready-to-install solution designed for reliability and ease of use.
- โ VIN-Programmed for Your Van: We flash the module with the latest GM software matched to your VIN. This ensures perfect communication with your vehicle’s Engine Control Module (ECM) and other systems right out of the box.
- โ Restores Factory Performance: By precisely controlling shift points and line pressure, this TCM restores the smooth, efficient operation you expect from your transmission.
- โ Built to OEM Specifications: Engineered for durability, this module meets or exceeds original equipment standards, backed by a one-year warranty for your peace of mind.
- โ Broad Compatibility: This T42 module is a direct replacement for a wide range of part numbers, including 24252114, 24234503, 24235754, and more.
Plug-and-Play Installation: No Dealer Visit Required
For the Chevy Express and GMC Savana vans, this is one of the easier electronic repairs you can do. The entire process typically takes less than 30 minutes.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the TCM: On Express and Savana vans, the TCM is conveniently located in the engine compartment on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the old module from its bracket.
- Install the New Module: Bolt the new, pre-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. While the module is pre-programmed, it’s good practice to use a basic scan tool to clear any stored DTCs from the system.
Frequently Asked Questions (FAQ)
Q: Do I need to take my van to a dealer after installing this part?
A: No. Because we program the module to your VIN before it ships, it is ready for immediate installation and operation. This step completely eliminates the need for a dealer visit for programming.
Q: Will this fix a P0700 trouble code?
A: A P0700 code simply means the TCM has detected a fault and has requested the check engine light be turned on. This module will often resolve the underlying issue (like a faulty solenoid driver) that caused the P0700, but you should always scan for other transmission-specific codes to confirm the diagnosis.
Q: Where is the TCM located on my 2009 Express 1500?
A: On the 2006-2014 Express and Savana vans, the Transmission Control Module is located in the engine bay, on the right-hand (passenger) side, making it very accessible for replacement.
Q: Is there a core charge for this part?
A: No, there is no core charge. You can keep or dispose of your old module without the hassle of returning it.