Restore Flawless Shifting to Your GM Truck or SUV
Is your 2007-2013 GMC Sierra 1500 suffering from harsh shifting, delayed gear engagement, or a frustrating 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 every shift, managing torque converter lockup, and ensuring the powertrain operates efficiently. When it fails, it can lead to poor performance, decreased fuel economy, and even leave you stranded in limp mode. This genuine OEM-quality T42 TCM, part number 24235754, is the definitive solution to restore your vehicle’s transmission to its original, smooth-operating condition.
From the Diagnostic Bay
We had a 2008 Silverado 1500 come into the shop with a P0752 code (Shift Solenoid ‘A’ Stuck On) and really erratic 1-2 shifts. The customer had already replaced the solenoid twice with no luck. After a quick data scan, we saw the command signals from the TCM were inconsistent. The solenoids were fine; the TCM was the real culprit. Instead of continuing to throw parts at it, we installed a VIN-programmed T42 module. The truck was shifting perfectly within 30 minutes, saving the customer time, money, and a lot of frustration. It’s a textbook example of why diagnosing the controller is just as important as checking the mechanical parts.
Diagnosing Your Sierra 1500 T42 TCM Failure
A failing transmission computer can manifest in several ways, often mimicking mechanical transmission problems. Before condemning your transmission, it’s crucial to consider the TCM as a potential point of failure. This module is the key to resolving many persistent and confusing transmission issues. Our pre-programmed module simplifies the repair process, eliminating the need for expensive dealership visits for software flashing.
Common Symptoms of a Faulty T42 TCM
- ✔ Erratic and Harsh Shifting: Your truck may slam into gear, hesitate between shifts, or feel unpredictable.
- ✔ Stuck in Gear / Limp Mode: The transmission may refuse to shift out of a single gear (often 2nd or 3rd) to protect itself from further damage.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light will illuminate on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): You’ll often find codes like P0700 (Transmission Control System Malfunction) or various solenoid-specific codes (P0750, P0751, etc.).
- ✔ No Upshift or Downshift: The vehicle may fail to shift to higher gears as you accelerate or fail to downshift when you slow down.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter operation caused by a bad TCM can significantly impact your MPG.
The Plug-and-Play Advantage: Pre-Programmed for Your Vehicle
One of the biggest hurdles in replacing modern electronic modules is the need for specialized programming. We eliminate that step entirely. Simply provide your vehicle’s VIN during checkout, and we will program this Sierra 1500 T42 TCM with the latest GM software specific to your truck. This ensures that it communicates perfectly with your engine computer and other vehicle systems right out of the box. No trips to the dealer, no expensive scan tools required—just a straightforward installation for a lasting repair.
Installation and Compatibility
Installation is simple for the average DIY mechanic. On most GMT900 trucks like the Sierra and Silverado, the T42 TCM is located in the engine bay, typically next to the battery. Disconnect the battery, unplug the old module’s electrical connectors, unbolt it, and install the new one in its place. Reconnect everything, and you’re ready to go. We recommend using a basic scan tool to clear any stored fault codes after installation to ensure a clean slate for the new module.
This module is a direct replacement for a wide range of part numbers, including: 24252114, 24234503, 24230461, 24234274, 24235340, 24238856, 24239224, and many more. It fits a vast array of 2006-2014 GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E, from the Chevrolet Tahoe to the Cadillac DTS.
Frequently Asked Questions
Do I need to have this TCM programmed by a dealer?
No. This module comes pre-programmed to your vehicle’s specific VIN. It is a true plug-and-play solution, saving you the time and expense of a dealership visit.
Will this fix a P0700 transmission code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause that triggers a P0700, it’s essential to scan for other, more specific codes (like solenoid or sensor codes) to confirm the diagnosis.
Where is the T42 TCM located on my 2009 Sierra 1500?
On most 2007-2013 Sierra and Silverado models, the T42 TCM is conveniently located in the engine compartment, mounted on a bracket right next to the vehicle’s main battery.
Is this a new or used part?
This is a high-quality, OEM-standard component that has been thoroughly inspected and prepared to ensure reliability and longevity. It is backed by our one-year warranty for your peace of mind.
Is there a core charge for my old part?
No, there is no core charge required for this part. You can keep your old module without any hassle or need to return it.