Restore Flawless Shifting to Your GM Truck or SUV
If your 2007 GMC Sierra 2500 is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, the culprit is often a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can sideline a perfectly good truck, leading to frustrating and costly diagnostic dead ends. This T42 TCM, part number 24234274, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
The TCM is the brain of your automatic transmission, controlling everything from shift points and line pressure to torque converter lockup. When it fails, communication between the engine and transmission breaks down, resulting in the harsh shifting, poor fuel economy, and warning lights you’re likely experiencing. This module is engineered to OEM specifications, ensuring it seamlessly restores communication and gets your vehicle operating as the factory intended. Don’t let a bad module convince you that you need a new transmission. A replacement 2007 Sierra 2500 Transmission Module is often all that’s needed to get you back on the road with confidence.
Case Study: A Tricky Diagnosis
A customer brought in his 2007 Sierra 2500 HD with the 6.0L engine, complaining of it being stuck in 3rd gear (limp mode) and a check engine light. His local shop quoted him for a full transmission rebuild, suspecting internal damage. After pulling the codes, I saw a P0700 (Transmission Control System Malfunction) and several solenoid communication errors. Instead of tearing down the transmission, I first checked the TCM. After swapping in one of our VIN-programmed T42 modules—a 20-minute job—all the codes cleared, and the truck shifted perfectly on the test drive. We saved him thousands of dollars and days of downtime. This is a classic failure scenario for these modules.
Is Your Truck Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs replacement. Addressing it promptly with a new 2007 Sierra 2500 Transmission Module can prevent further damage to your transmission’s mechanical components.
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ Vehicle is stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related faults are present.
- ✔ Complete loss of upshifting or downshifting capabilities.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ Intermittent loss of communication with the scan tool.
A Straightforward Guide to Installation
Replacing the TCM is a job most DIYers can handle in their own driveway with basic hand tools. For the 2007 Sierra 2500, the module is conveniently located, making for a quick swap.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and help reset the vehicle’s electronic systems.
- Locate the Module: On your Sierra, you will typically find the TCM mounted next to the battery in the engine compartment.
- Disconnect and Remove: Carefully unclip the electrical connectors. Be gentle to avoid damaging the plastic tabs. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM into place. Securely reconnect the electrical harnesses, ensuring they click into place.
- Final Steps: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few minutes. While our programming handles the critical setup, it’s good practice to use a basic scan tool to clear any stored fault codes.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L80E. While this page focuses on the 2007 Sierra 2500 Transmission Module, it also fits the models listed below. Always verify your part number (24234274) or contact us with your VIN to ensure perfect compatibility.
- Chevrolet Silverado, Tahoe, Suburban, Express, Colorado, Impala, Cobalt, HHR
- GMC Sierra, Yukon, Savana, Envoy, Canyon
- Buick LaCrosse, Lucerne, Rainier
- Cadillac DTS
- Pontiac G6, Grand Prix
- Saturn Vue, Aura, Ion
- Hummer H3
- Saab 9-7X
What does ‘VIN Programmed’ actually mean?
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM-certified software onto the module before we ship it. This ensures it communicates perfectly with your truck’s other computers (like the ECM) 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 special tools are required. A basic socket set to remove the mounting bolts and a flathead screwdriver to help with the connector clips are typically all you need. The entire process usually takes less than 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general transmission fault request from the TCM to the ECM to turn on the check engine light. While this module often resolves the root cause (like a solenoid circuit fault stored in the TCM), it’s important to scan for more specific P-codes (e.g., P0753) to confirm the TCM is the likely point of failure.
Is there a core charge for my old part?
No, there is no core charge on this module. You can keep your old part or recycle it locally without the hassle of shipping it back to us, saving you time and money.