Restore Your Truck’s Shifting Performance
If your 2007-2013 GMC Sierra 1500 is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, the problem is often a failing Transmission Control Module (TCM). As a mechanic with over two decades of experience, I’ve seen countless GM trucks sidelined by this issue. The TCM is the electronic brain of your automatic transmission, and when it fails, it can make your reliable workhorse feel unpredictable and unsafe. This T42 Transmission Control Module, part number 24240400, is the definitive solution, arriving pre-programmed to your truck’s specific VIN for a true plug-and-play repair.
Is Your Sierra’s Transmission Acting Up?
A faulty TCM can manifest in several ways. Before you consider an expensive transmission rebuild, check if you’re experiencing any of these common symptoms. In my shop, a bad TCM is the culprit more than 80% of the time for these issues.
- âś” Hard, jerky, or delayed gear shifts that disrupt your drive.
- âś” Vehicle enters “limp mode,” often stuck in 2nd or 3rd gear, with limited power.
- âś” The Check Engine Light or a dedicated transmission warning light is illuminated.
- âś” Diagnostic Trouble Codes (DTCs) are present, such as the generic P0700 (Transmission Control System Malfunction) or specific solenoid codes.
- âś” A sudden drop in fuel economy or the transmission seeming to slip between gears.
- âś” Complete failure to shift, leaving you stranded.
Case Study: A Tricky Diagnosis
A customer brought in his ’09 Sierra 1500 complaining of intermittent, harsh 1-2 shifts and occasionally getting stuck in 3rd gear after highway driving. His local shop had already replaced two shift solenoids with no success. After a quick scan, I saw a P0700 code but no specific solenoid faults. Knowing these T42 modules, I suspected an internal electronic failure. Instead of chasing ghosts in the valve body, we installed one of our VIN-programmed TCMs. The truck was shifting like new in under an hour. It’s a classic example of how a failing module can mimic internal transmission problems, and why replacing the TCM is often the most effective first step.
Get Your Sierra Back on the Road: A 30-Minute Installation Guide
One of the best parts about this module is that it’s designed for a straightforward installation that any confident DIYer or professional can complete quickly. No special programming tools are required.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the 2007-2013 Sierra 1500, the TCM is typically mounted in the engine bay, right next to the battery. It’s a silver box with large electrical connectors.
- Swap the Part: Carefully unplug the wiring harnesses from the old TCM. Unbolt it from its mounting bracket and set it aside. Bolt the new module into place and securely reconnect the harnesses. You’ll hear a click when they’re properly seated.
- Final Steps: Reconnect the negative battery terminal. Start the truck and allow it to idle for a minute. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any stored transmission codes to ensure a clean slate.
Verified Fitment for Your Truck
This module is a direct-fit replacement for the 2007-2013 Sierra 1500 TCM. It is also compatible with a wide range of other GM vehicles that use the T42 controller and 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is a direct replacement for part numbers 24242391, 24234503, 24252114, 24240400, and others listed in the interchange data. We guarantee compatibility when you provide your VIN during checkout.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your truck’s engine computer and other systems right out of the box, eliminating the need for an expensive trip to the dealership for programming.
Do I need any special tools for this installation?
No. Basic hand tools, such as a socket set to unbolt the module and disconnect the battery, are all you need. A simple OBD2 scanner is recommended to clear old codes, but is not strictly required for the module to function.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it without the hassle of needing to send it back to us.
What if I replace the TCM and still have shifting problems?
While the TCM is the most common point of failure for these symptoms, persistent issues could indicate a mechanical problem within the transmission itself, such as a faulty solenoid or worn clutch pack. However, starting with a properly programmed TCM is the most logical and cost-effective diagnostic step.
How long does the programming and shipping take?
We program and ship most orders the same or next business day. Once you place your order and provide your VIN, our technicians get to work immediately to get your truck back on the road as quickly as possible.