Restore Flawless Shifting to Your GMC Sierra
If you’re dealing with the frustration of a transmission that won’t shift correctly, gets stuck in gear, or throws confusing error codes, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can bring a perfectly good truck to a standstill. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. This T42 Transmission Control Module, part number 24234274, is the definitive solution for your 2007-2013 Sierra 1500 Pickup, designed to restore the crisp, predictable shifting you expect.
The TCM is the electronic brain of your automatic transmission. It processes data from various sensors to control shift solenoids, manage torque converter clutch lockup, and regulate fluid pressure. When it fails, the communication breaks down, leading to the erratic behavior you’re likely experiencing. Our module is a direct-fit, OEM-quality replacement that comes fully programmed to your truck’s specific Vehicle Identification Number (VIN), making it a true plug-and-play fix that eliminates the need for an expensive trip to the dealership.
Case Study: A Tricky Diagnosis
I remember a 2011 Sierra 1500 that came into my shop with a maddeningly intermittent problem. The owner complained of harsh 1-2 shifts when cold and occasionally getting stuck in 3rd gear (limp mode) on long highway drives, but with no consistent check engine light. We checked the fluid, inspected the wiring, and couldn’t find a mechanical fault. The codes were intermittent solenoid circuit errors. Instead of recommending a costly transmission teardown, we started with the brain. We installed a VIN-programmed T42 TCM. The swap took less than 20 minutes. The customer called a week later, ecstatic that his truck drove like new again. It’s a classic example of how this single component can solve a complex-seeming issue.
Is Your Sierra Exhibiting These Transmission Faults?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The truck is stuck in “limp mode,” often refusing to shift out of 2nd or 3rd gear.
- ✔ An illuminated Check Engine Light or Transmission Warning Light with codes like P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Errors), or other transmission-related DTCs.
- ✔ Complete loss of shifting, either failing to upshift or downshift.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
- ✔ Unpredictable electrical behavior related to transmission function.
A Straightforward Guide to Installation
One of the best features of this module is how simple it is to install. You don’t need a lift or specialized transmission tools. For most Sierra 1500 models in this year range, the process is quick and easy.
- Safety First: Always disconnect the negative terminal from your truck’s battery before starting any electrical work.
- Locate the TCM: On your 2007-2013 Sierra 1500, the TCM is typically mounted in the engine compartment, right next to the battery. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harness connectors from the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed TCM into place. Securely plug in the harness connectors—they should click firmly into place.
- Final Steps: Reconnect the negative battery terminal. While the battery disconnect often clears codes, it’s best practice to use a basic OBD2 scan tool to clear any stored DTCs from the system’s memory. Start the vehicle and enjoy your smooth-shifting transmission!
Verified Vehicle Compatibility
This T42 TCM is engineered for a precise fit and function in a wide range of General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While it is the specified part for the 2007-2013 GMC Sierra 1500, it also fits many other popular models, including:
- Chevrolet Silverado 1500
- Chevrolet Tahoe & Suburban
- GMC Yukon & Yukon XL
- Chevrolet Avalanche
- GMC Savana & Chevrolet Express Vans
- And many other GM cars, trucks, and SUVs from 2006-2014.
This part is a direct interchange for several service numbers, including 24252114, 24234503, 24230461, and more, ensuring you get the correct component for your repair.
Frequently Asked Questions
What exactly does ‘VIN Programmed’ mean for my truck?
It means we load your truck’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your vehicle’s engine computer and other systems right out of the box, with no additional programming required.
Do I need to take my truck to a dealer after installation?
No. The primary benefit of our service is that the module is ready for installation upon arrival. This saves you the time, hassle, and significant expense of having a dealership program a blank module.
Is this a difficult part to install for a DIYer?
Not at all. For the Sierra 1500, this is one of the easier electronic components to replace. It’s located in an accessible spot in the engine bay and requires only basic hand tools. The entire job can typically be completed in under 30 minutes.
What if I still have a Check Engine Light after I install it?
After installation, you must clear all old Diagnostic Trouble Codes (DTCs) from the computer’s memory using a standard OBD2 scanner. If a light returns, it may indicate a separate issue (like a faulty sensor or wiring) that the old TCM was also reporting.
Is there a warranty included with this part?
Yes, this transmission control module comes with a one-year warranty, giving you confidence and peace of mind in your repair.
Do I need to send my old part back?
No, there is no core charge for this part. You can keep or dispose of your old module without any extra hassle or fees.