Restore Flawless Shifting to Your GM Vehicle
Is your truck, SUV, or car suffering from harsh, erratic shifting, getting stuck in gear, or flashing a persistent check engine light? A failing Transmission Control Module (TCM) is often the culprit behind these frustrating and potentially damaging issues. This replacement 24243921 GM T42 TCM is the definitive, hassle-free solution. It arrives fully pre-programmed to your vehicle’s specific VIN, ensuring a perfect plug-and-play installation that restores the smooth, reliable performance you depend on, without a costly trip to the dealership.
Common Symptoms & Your Solution
If you’re experiencing any of the following, a faulty TCM is the likely cause. This module is engineered to resolve these exact problems:
- Abrupt, harsh, 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
- Poor fuel economy and potential transmission overheating
- Complete loss of communication with the transmission
Features & Tangible Benefits
- âś” Ready for Immediate Installation: We program this module to your vehicle’s specific VIN using the latest GM software. It works right out of the box, eliminating the need for expensive dealership programming and saving you significant time and money.
- âś” Restores Smooth, Factory Performance: This module precisely manages shift points, line pressure, and torque converter lockup, fixing erratic behavior and restoring the comfortable ride you expect from your vehicle.
- âś” Engineered for Durability: Built to meet or exceed original GM specifications for performance and longevity, ensuring a long-term, reliable repair for your transmission.
- âś” Solves Common Fault Codes: The pre-programming process directly addresses the software and electronic faults that trigger common transmission DTCs, providing a comprehensive fix for your vehicle’s issues.
- âś” Purchase with Confidence: This unit is backed by our one-year replacement warranty.
- âś” Broad GM Compatibility: This 24243921 GM T42 TCM is a direct replacement for a wide range of service numbers, making it the right part for dozens of GM trucks, SUVs, and cars from 2006-2014.
An Expert’s Diagnostic Tip: From over 20 years of hands-on diagnostics, I’ve seen countless drivers replace a TCM only to find the problem persists. The reason? The module wasn’t programmed. A modern TCM is the ‘brain’ of your transmission, and it must speak the exact same digital language as your vehicle’s main computer. Our VIN programming service ensures this perfect communication from the moment you plug it in, solving the root cause of those frustrating electronic and shifting faults, not just replacing a part.
Frequently Asked Questions
Do I need to take this part to the dealer for programming?
Absolutely not. This is the main benefit of our service. We pre-program the module to your vehicle’s VIN before shipping, so it’s ready for immediate installation right out of the box. This saves you the time, hassle, and expense of a dealership visit.
Is this a difficult part to install?
For most models, the installation is straightforward and can be completed in under 30 minutes with basic hand tools. The TCM is typically located in the engine compartment, such as next to the battery, on a strut tower, or under the air cleaner box. We recommend disconnecting the battery before starting the replacement.
How do I know for sure that my TCM is failing?
The most common indicators are erratic shifting, the vehicle entering ‘limp mode,’ and specific transmission-related trouble codes (like P0700). If you are experiencing a combination of these symptoms, the TCM is the most likely cause. This replacement 24243921 GM T42 TCM is designed to correct these exact issues.
What does ‘limp mode’ mean?
Limp mode is a protective feature where the vehicle’s computer locks the transmission into a single gear (usually 2nd or 3rd) to prevent further damage when a critical fault is detected. This allows you to ‘limp’ the vehicle to a safe location for repair. Replacing a faulty TCM will resolve this condition.
Will this module fit my specific vehicle?
This module fits a very wide range of 2006-2014 General Motors vehicles. Please review the detailed fitment list on this page to confirm compatibility with your specific year, make, and model. Providing your VIN during checkout ensures we program it correctly for your application.
Is there a core charge for my old part?
No, there is no core charge. You are not required to send your old, faulty module back to us, making the process simpler and more convenient for you.