Restore Peak Transmission Performance in Your GM Vehicle
Is your 2006 Chevrolet Trailblazer EXT, or another compatible GM vehicle, suffering from erratic shifting, getting stuck in gear, or displaying a check engine light? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating precise gear changes, managing torque converter lockup, and ensuring overall drivetrain efficiency. When it falters, the entire driving experience is compromised, leading to poor performance, reduced fuel economy, and potential damage to mechanical components.
This genuine OEM-quality T42 Transmission Control Module, part number 24235340, is the definitive solution to these frustrating issues. Unlike generic modules that require expensive dealership visits for programming, this unit arrives at your door fully pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This ensures seamless, plug-and-play installation and immediate restoration of your transmission’s intended function. By using the latest GM software updates during programming, we guarantee optimal shift patterns, correct solenoid operation, and resolution of common diagnostic trouble codes (DTCs) right out of the box.
From the Diagnostic Bay
We had a 2008 GMC Sierra 1500 come in with a classic complaint: harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The owner had already replaced two shift solenoids based on some forum advice, but the problem persisted. After connecting our scan tool, we saw the generic P0700 code, but also intermittent communication loss with the TCM. Instead of throwing more parts at it, we inspected the module. We found no external issues, but experience told us the internal logic was failing. We installed one of our VIN-programmed T42 modules. The installation took less than 20 minutes. After a quick battery disconnect to clear adaptive memory and a test drive, the truck shifted like it just rolled off the assembly line. It’s a perfect example of how correctly diagnosing the TCM as the root cause saves time, money, and a lot of headaches.
Diagnosing a Faulty 2006 Trailblazer EXT TCM
A failing TCM can manifest in various ways, often mimicking mechanical transmission problems. Before condemning your transmission, it’s crucial to consider the module as the potential culprit. A faulty TCM can no longer accurately interpret data from sensors like the vehicle speed sensor, throttle position sensor, and turbine speed sensor. This communication breakdown results in poor shifting commands and a host of noticeable symptoms.
Common Symptoms of TCM Failure
- âś” Erratic and Harsh Shifting: Experiencing sudden, jerky gear changes, or a noticeable bang when the transmission shifts up or down.
- âś” Delayed Engagement: A significant pause after shifting from Park to Drive or Reverse before the gear engages.
- âś” Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to prevent further damage.
- âś” Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- âś” Diagnostic Trouble Codes (DTCs): Common codes include P0700 (Transmission Control System Malfunction) and various solenoid-specific codes (e.g., P0750, P0751).
- âś” Poor Fuel Economy: Inefficient shifting and incorrect torque converter lockup can lead to a sudden drop in your vehicle’s MPG.
- âś” No Communication: A scan tool may be unable to communicate with the transmission control module, indicating a complete failure.
Plug-and-Play Solution with VIN Programming
The single greatest benefit of this module is our expert VIN programming service. When you place your order, you provide us with your vehicle’s VIN. We then flash the module with the exact software and calibrations specified by General Motors for your specific build. This process accounts for your engine type, axle ratio, and tire size, ensuring that the TCM works in perfect harmony with your vehicle’s powertrain. This eliminates the need for a trip to the dealership and the use of their expensive Tech II scan tool for setup. It’s a hassle-free repair that can be completed in your own driveway.
This unit is a direct replacement for a wide range of GM part numbers, including 24252114, 24234503, 24230461, and many more. It is engineered to meet or exceed original equipment standards for durability and performance, backed by a one-year warranty for your peace of mind.
Frequently Asked Questions
What is a T42 TCM and what does it do?
The T42 TCM is a specific generation of Transmission Control Module used by General Motors in many 2006-2014 vehicles. It acts as the computer for your automatic transmission, controlling shift solenoids, monitoring sensors, and managing torque converter clutch application to provide smooth and efficient gear changes.
Do I need to program this module after I receive it?
No. This module comes pre-programmed to your vehicle’s VIN. It is a true plug-and-play solution, ready for installation right out of the box with no additional dealership programming required.
Where is the TCM located on my 2006 Trailblazer EXT?
On a 2006 Trailblazer EXT with the 8-cylinder engine, the TCM is typically located in the engine compartment on the left-hand (driver’s) side. Location can vary on other models, but common spots include next to the battery, under the air cleaner box, or on a frame rail.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating that the Engine Control Module (ECM) has received a request from the TCM to turn on the check engine light. While this module often resolves the underlying transmission issue causing the P0700, it’s important to have the specific transmission codes (e.g., P07xx) read to confirm the diagnosis.
Is a core charge required for this part?
No, there is no core charge for this module. You are not required to send your old, faulty part back to us, saving you time and shipping costs.