Restore Flawless Shifting to Your GM Vehicle
Is your work van, truck, or SUV suffering from harsh shifting, getting stuck in gear, or throwing transmission codes? A faulty Transmission Control Module (TCM) is often the culprit, leading to frustrating downtime and unreliable performance. This replacement GM T42 TCM, pre-programmed to your vehicle’s specific VIN, is the definitive solution to get you back on the road with confidence. It’s engineered to restore the precise electronic communication between your engine and transmission, ensuring smooth, predictable performance just like the day it left the factory.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, this module is designed to be the fix. It directly addresses the root cause of many common transmission problems in vehicles like the Chevrolet Express, Silverado, Tahoe, and GMC Savana. Stop guessing and replace the component responsible for managing your transmission’s brain.
- Harsh, erratic, or delayed gear shifts
- Vehicle stuck in “limp mode” (usually 2nd or 3rd gear)
- Check Engine Light or Transmission Warning Light is on
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults
- Failure to upshift or downshift properly
- Noticeable decrease in fuel economy
Installing our Programmed GM T42 Transmission Control Module is the most effective way to resolve these symptoms and prevent further damage to your transmission’s mechanical components.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: This module arrives at your door pre-flashed with your vehicle’s VIN and the latest GM software updates. This ensures 100% compatibility and eliminates the need for expensive trips to the dealership for programming.
- ✔ Plug-and-Play Installation: Because it’s programmed, installation is a straightforward, unbolt-and-rebolt process. Simply disconnect the battery, swap the module, and you’re ready to go.
- ✔ Restored Transmission Performance: Regain the smooth shifting, consistent torque converter lockup, and reliable operation you depend on for work or family transport.
- ✔ OEM-Standard Quality: Built to meet or exceed original equipment standards for durability and function, ensuring it can handle the demands of a work truck or daily driver.
- ✔ Broad Compatibility: A direct replacement for a wide array of service numbers including 24252114, 24234503, 24235340, and more, covering dozens of GM models with 4-speed automatic transmissions (4L60E, 4L65E, 4L70E).
- ✔ Warranty Protection: This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
Many technicians and DIYers make the mistake of installing a used or non-programmed TCM, only to find the vehicle won’t start or shift correctly. That’s because the TCM is part of your vehicle’s security and communications network (the CAN bus). It must have the correct VIN-specific software to ‘talk’ to the Engine Control Module (ECM) and other systems. Our pre-programming service handles this complex step for you, saving you hours of troubleshooting and the high cost of a dealership scan tool. This is the key to a successful, one-time repair.
By choosing this Programmed GM T42 Transmission Control Module, you are not just buying a part; you are buying a complete, hassle-free solution designed to get your vehicle operating correctly as quickly as possible.
Frequently Asked Questions
Is this part really plug-and-play?
Yes. Because we program the module to your vehicle’s specific VIN before shipping, it is ready for installation right out of the box. No further programming or dealership visits are required. We recommend disconnecting the battery during installation to allow the vehicle’s systems to reset.
How do I know if my TCM is the problem?
Common signs of a failing TCM include erratic shifting, the vehicle going into limp mode, and specific diagnostic trouble codes like P0700 (Transmission Control System Malfunction). If you are experiencing these symptoms, the TCM is a very likely cause.
Where is the T42 TCM located on my vehicle?
Location varies by model. Common locations include the engine compartment on the driver’s or passenger’s side, next to the battery, under the air cleaner box, or on the LH strut tower. The fitment list in our description provides specific locations for many models.
Do I need to return my old part (core)?
No, there is no core charge for this part. You can keep or dispose of your old module without any additional hassle or cost.
What happens if I install a module that isn’t programmed to my VIN?
An unprogrammed or incorrectly programmed TCM will not be able to communicate properly with your vehicle’s other computers. This typically results in a no-start condition, incorrect shifting, or persistent error codes. Our VIN programming service prevents these issues entirely.
Will this fix my P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. In many cases, a failing TCM is the source of the P0700 code itself. Replacing it with our Programmed GM T42 Transmission Control Module is a very common and effective solution for this and related transmission codes.