Is your 2006 Chevrolet Trailblazer EXT suffering from harsh, erratic shifting, getting stuck in gear, or flashing a check engine light? A failing Transmission Control Module (TCM) is often the culprit, causing immense frustration and compromising your vehicle’s reliability. Put an end to shifting nightmares with this precision-programmed T42 Transmission Control Module, designed to restore the smooth, dependable performance you need from your SUV.
Common Symptoms & Your Solution
A faulty TCM can manifest in several ways, turning your daily drive into a stressful ordeal. If you’re experiencing any of the following, this module is the definitive solution:
- Abrupt, harsh, or delayed gear shifts
- Vehicle entering “limp mode,” stuck in a single gear (usually 2nd or 3rd)
- Illuminated Check Engine Light or Transmission Warning Light
- Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults
- Failure to upshift or downshift correctly, leading to poor acceleration and fuel economy
- Complete loss of transmission communication
Our Programmed 24235340 T42 TCM directly addresses these issues by replacing the faulty electronic brain of your transmission with a reliable, VIN-matched unit, ensuring communication and commands are executed flawlessly.
Features & Benefits
- ✔ Plug-and-Play Installation: This module arrives pre-programmed to your Trailblazer’s specific Vehicle Identification Number (VIN). This critical step eliminates the need for expensive dealership programming, saving you time and money.
- ✔ Restored Drivability: By precisely managing shift points, line pressure, and torque converter lockup, this TCM restores the smooth and predictable shifting your vehicle had from the factory.
- ✔ Lasting Reliability: Built to meet or exceed strict OEM specifications, this module is engineered for durability, providing a long-term solution to common transmission electronic failures.
- ✔ Clear Fault Codes: A properly functioning TCM is essential for resolving persistent transmission-related DTCs and turning off the check engine light.
- ✔ No Core Charge: Keep your old part without the hassle or expense of returning a core. The price you see is the price you pay.
- ✔ This unit is backed by our one-year replacement warranty.
Expert Insight: The Critical Role of VIN Programming
From my 20 years of experience, I can’t overstate the importance of VIN programming for a T42 TCM. These modules are not one-size-fits-all. Each one contains specific software calibrations for your vehicle’s engine, tire size, and gear ratios. Installing a non-programmed or incorrectly programmed module is a recipe for continued shifting problems or even new ones. Our process ensures the module you receive is a perfect electronic match for your vehicle, guaranteeing a successful repair the first time.
Frequently Asked Questions
What does the T42 TCM actually do?
The T42 Transmission Control Module (TCM) is a small computer that acts as the brain for your automatic transmission. It receives data from various sensors on the engine and vehicle, and uses that information to control exactly when and how the transmission shifts gears, ensuring optimal performance, fuel efficiency, and smoothness.
Is this module difficult to install?
No, installation is typically very straightforward for a DIYer with basic tools. On a 2006 Trailblazer EXT, the TCM is located in the engine compartment on the left-hand side. The process usually involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then installing the new one in reverse order. It often takes less than 30 minutes.
Do I absolutely need to provide my VIN?
Yes. The VIN (Vehicle Identification Number) is essential for us to load the correct GM factory software onto your new module. Without it, the TCM will not communicate properly with your vehicle’s other computers, and your transmission will not function correctly. This programming step is what makes the installation plug-and-play.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code, meaning the TCM has detected a problem and has requested the check engine light to be turned on. While a faulty TCM can cause a P0700, this code is often accompanied by other, more specific codes. Replacing a faulty module is a common fix for this code, but you should always diagnose any other codes that are present as well.
Is this Programmed 24235340 T42 TCM compatible with other GM vehicles?
Absolutely. While this listing is focused on the 2006 Trailblazer EXT, this T42 module is used across a vast range of GM trucks, vans, and cars from roughly 2006-2014, including the Silverado, Tahoe, Savana, Impala, and many more. The key is our VIN-specific programming, which makes it compatible with any vehicle on the fitment list.