If your 2007-2013 GMC Sierra 1500 is suffering from harsh shifts, getting stuck in gear, or throwing transmission codes, you’ve likely pinpointed the problem: a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM trucks sidelined by this exact issue. A faulty TCM doesn’t just make for a frustrating drive; it puts unnecessary strain on your entire transmission. This T42-style TCM, part number 24255280, is the definitive solution to restore the crisp, reliable shifting your truck had from the factory.
The biggest headache with replacing a TCM has always been the expensive and time-consuming trip to the dealership for programming. We eliminate that step entirely. By providing your vehicle’s VIN at checkout, we program the module for you. It arrives at your door ready for a true plug-and-play installation, loaded with the latest GM software updates. This ensures perfect communication between your engine and transmission, solving common diagnostic trouble codes (DTCs) and restoring optimal performance and fuel efficiency right out of the box.
A Technician’s Notebook
I remember a 2011 Sierra 1500 that came into the shop with the classic complaint: ‘It shifts hard sometimes, but not always.’ The customer was frustrated because the issue was intermittent. We scanned it and found a P0752 (Shift Solenoid A Stuck On) code, but the solenoid itself tested fine. Experience pointed me to the TCM. These modules can develop internal connection failures from heat cycles and vibration, causing erratic signals. We installed a VIN-programmed TCM, and the problem was solved instantly. The customer avoided a costly diagnostic rabbit hole and was back on the road the same afternoon.
Is Your Sierra Showing These Telltale Signs?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement. Ignoring these symptoms can lead to more severe transmission damage.
- ✔ Harsh, jerky, or delayed gear shifts.
- ✔ The truck is stuck in ‘limp mode’ (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift.
- ✔ A noticeable drop in fuel economy.
- ✔ Inconsistent or no communication with the TCM when using a scan tool.
Your 30-Minute Path to a Smooth Ride
This is a job most DIYers can handle with basic tools. For the 2007-2013 Sierra 1500, the TCM is conveniently located next to the battery in the engine compartment, making access simple.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts and help reset the vehicle’s systems.
- Locate the Module: Find the TCM mounted next to the battery tray. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New TCM: Mount your new, pre-programmed TCM onto the bracket and securely plug in the wiring harnesses. You should hear a click as they lock into place.
- Final Steps: Reconnect the negative battery terminal. Start the truck and allow it to idle for a few minutes. While the module is pre-programmed, it’s good practice to use a basic scan tool to clear any stored DTCs from the system.
Verified Fitment for Your GM Truck or SUV
This module is a direct replacement for part number 24255280 and interchanges with several other GM service numbers. It is engineered for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page focuses on the 2007-2013 Sierra 1500 TCM, it also fits the following models (please verify location and options):
- ✔ Chevrolet Silverado, Tahoe, Suburban, Avalanche, Express Van, Colorado
- ✔ GMC Yukon, Savana Van, Canyon, Envoy
- ✔ Cadillac DTS, Buick LaCrosse, Lucerne
- ✔ Pontiac G6, Grand Prix, Hummer H3, and more.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This is the primary benefit of our service. We pre-program the module to your vehicle’s specific VIN before shipping. It arrives ready to install, with no additional programming or dealer visits required.
Is this part difficult to install?
Not at all. For most trucks like the Sierra, it’s located next to the battery and can be swapped in under 30 minutes with basic hand tools. Our installation guide above provides a clear step-by-step process.
What is a core charge? Do I need to send my old part back?
There is no core charge for this part. You can keep your old module or recycle it locally without the hassle of returning it to us.
What kind of warranty is included?
This module is backed by our one-year warranty, giving you confidence and peace of mind in your repair.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main computer (ECM) to turn on the check engine light. It means the TCM has stored its own specific codes. If the root cause is a faulty TCM, replacing it with our programmed unit will resolve the P0700 and the underlying transmission codes.