Is your 2007 GMC Sierra 2500 HD experiencing frustrating transmission problems like harsh shifting, getting stuck in gear, or a persistent check engine light? A failing Transmission Control Module (TCM) is often the culprit. As the electronic brain of your automatic transmission, the TCM dictates every gear change and torque converter operation. When it falters, it can make your powerful truck feel unreliable and unsafe. This replacement T42 TCM, part number 24243901, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play fix.
Over my 20 years of hands-on diagnostics, I’ve seen countless GM trucks and SUVs come into the shop with what owners feared was a catastrophic transmission failure. More often than not, the root cause was a faulty TCM. This module is the key to restoring the crisp, predictable shifting performance your vehicle had when it was new. By installing our VIN-programmed module, you bypass the expensive dealership visit and the need for specialized programming tools, getting your truck back to work faster.
Case Study: A Tricky Diagnosis
A customer brought in a 2007 Sierra 2500 with the 6.0L engine, complaining of intermittent ‘limp mode’ and erratic shifting, especially when towing. His scanner showed a generic P0700 transmission fault code, but no specific solenoid codes. After checking the wiring harness and fluid levels, we suspected the TCM. These T42 modules are known to develop internal solder joint fractures from years of heat cycles in the engine bay. We swapped in a VIN-programmed module, and the truck’s shifting performance was immediately restored. The customer saved thousands compared to a full transmission replacement, all thanks to a correct diagnosis and a reliable part.
Is Your Truck Exhibiting These Telltale Signs?
- âś” Harsh, clunky, or delayed gear shifts that make driving uncomfortable.
- âś” The transmission refuses to shift out of a single gear (often 2nd or 3rd), known as ‘limp mode’.
- âś” Your dashboard is lit up with a Check Engine Light or Transmission Warning Light.
- âś” Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-related faults are present.
- âś” A noticeable drop in fuel economy or signs of the transmission overheating.
- âś” Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
- âś” Safety First: Before you begin, disconnect the negative terminal from your truck’s battery to prevent electrical shorts and reset the system.
- âś” Locate the Module: On your 2007 Sierra 2500, the TCM is typically located in the engine compartment, right next to the battery.
- âś” Disconnect and Remove: Carefully unplug the electrical connectors. Use a socket wrench to remove the bolts or nuts securing the old TCM to its bracket.
- âś” Install the New TCM: Mount the new, pre-programmed module in the same location and securely fasten it. Reconnect the electrical connectors, ensuring they click into place.
- âś” Final Steps: Reconnect the battery terminal. While our programming handles the critical setup, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU. Start the vehicle and test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This module is a direct replacement for part number 24243901 and other interchangeable numbers like 24252114 and 24234503. It is designed for a wide range of 2006-2014 General Motors vehicles equipped with 4-speed automatic transmissions (4L60E, 4L65E, 4L70E, 4L80E). While this page focuses on the 2007 Sierra 2500 TCM, it also fits models like the Chevrolet Silverado, Tahoe, Suburban, Express Van; GMC Yukon, Savana; Cadillac Escalade, and many more. Please verify your part number or consult our fitment list to ensure compatibility.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This Transmission Control Module comes fully programmed to your vehicle’s VIN. It is ready for installation right out of the box, saving you time and money on dealership programming fees.
Is this a difficult part for a DIY mechanic to install?
Not at all. The installation is very straightforward, typically taking less than 30 minutes with basic hand tools. Its location next to the battery on most Sierra/Silverado models makes it easily accessible.
What is a core charge? Do I need to send my old part back?
There is no core charge for this module. You are not required to return your old, faulty part, which simplifies the repair process for you.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other issues. Replacing a confirmed-bad TCM will resolve the code.
What is the warranty on this module?
This module is backed by our one-year, hassle-free warranty, giving you peace of mind and confidence in your repair.