Restore Peak Transmission Performance in Your Silverado
If your 2007-2013 Chevrolet Silverado 1500 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 countless GM trucks sidelined by this issue. This T42 TCM, part number 24240400, is the reliable, straightforward fix you need. It arrives pre-programmed to your truck’s specific Vehicle Identification Number (VIN), eliminating the need for expensive dealership flashing. This means you get a true plug-and-play solution that restores the crisp, predictable shifting your truck had from the factory.
The TCM is the brain of your automatic transmission, managing everything from shift points and line pressure to torque converter lockup. When it fails, communication breaks down, leading to the frustrating and potentially damaging symptoms you’re experiencing. Our module is built to meet or exceed original equipment standards, ensuring it can handle the demands of daily driving, towing, or hauling. By installing this pre-programmed Silverado 1500 TCM, you’re not just replacing a part; you’re restoring the core logic that makes your 4L60E, 4L65E, or 4L70E transmission operate smoothly and efficiently.
Case Study: A Tricky Diagnosis
A customer brought in his ’09 Silverado 1500, complaining of intermittent harsh downshifts and a check engine light that would come and go. His local shop had already replaced two shift solenoids, but the problem persisted. When I pulled the codes, I saw a P0700 (Transmission Control System Malfunction) and a U0101 (Lost Communication with TCM). Instead of just chasing solenoid codes, we checked the TCM’s power and ground feeds—they were solid. This pointed to an internal failure in the module itself. After installing one of our VIN-programmed T42 modules, the communication codes vanished, and the truck shifted perfectly on the test drive. It saved the customer from a potential transmission rebuild and got his work truck back on the road the same day.
Is Your Silverado’s Transmission Acting Up?
A faulty TCM can manifest in several ways. If you’re noticing any of these issues, it’s a strong indicator that your module needs replacement. Ignoring these signs can lead to more severe transmission damage down the line.
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle stuck in “limp mode,” often in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) like P0700, P0750, P0753, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy.
- ✔ Intermittent loss of communication with the scan tool.
A Straightforward Guide to Your Silverado TCM Swap
One of the best features of this part is its ease of installation. For most DIYers or professional mechanics, this is a job that can be completed in under 30 minutes with basic hand tools. This specific Silverado 1500 TCM is typically found right next to the battery in the engine bay.
- Safety First: Always disconnect the negative terminal from your truck’s battery to prevent electrical shorts and help reset the vehicle’s electronic systems.
- Locate the Module: On most 2007-2013 Silverado 1500 models, the TCM is mounted in a bracket directly next to the battery. It’s a silver box with a few large electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical connectors. There might be locking tabs you need to release. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, VIN-programmed module into place. Securely reconnect the electrical harnesses, making sure they click into place.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a scan tool to clear any stored DTCs from the system. Start the vehicle and enjoy your smooth-shifting transmission!
Verified Fitment for Your GM Truck or SUV
This T42 Transmission Control Module is a direct replacement for part number 24240400 and is compatible with a wide range of General Motors vehicles equipped with 4-speed automatic transmissions. While this page focuses on the Silverado 1500 TCM, it also fits many other models. Please verify your part number or contact us with your VIN to ensure perfect compatibility.
Interchangeable Part Numbers: 24252114, 24234503, 24230461, 24234274, 24235340, 24235754, 24238856, 24239224, 24239926, 24241806, 24243901, 24243921, 24255280, 24256960, 24235732, 24235753, 24240449, YNXS.
Fits Select Models Including:
- Chevrolet Silverado & GMC Sierra 1500/2500 (2007-2013)
- Chevrolet Tahoe & GMC Yukon (2007-2009)
- Chevrolet Suburban & GMC Yukon XL 1500 (2007-2008)
- Chevrolet Express & GMC Savana Vans (2006-2014)
- Chevrolet Avalanche 1500 (2007-2008)
- Hummer H3 (2008-2010)
- And many other GM cars, trucks, and SUVs from 2006-2014.
Frequently Asked Questions
What does “VIN Programmed” mean for my Silverado?
It means we load your truck’s specific Vehicle Identification Number (VIN) and the latest GM software onto the module before shipping. This ensures it communicates perfectly with your vehicle’s other computers (like the ECM) right out of the box, with no extra programming required.
Do I need to perform a transmission relearn procedure?
In most cases, a specific relearn procedure is not required. The module comes programmed with factory shift strategies. Simply installing it and driving normally will allow the system to fine-tune itself. Clearing old codes with a scan tool is recommended.
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 at your convenience, saving you the hassle and expense of shipping it back.
Will this fix a P0700 code?
A P0700 is a generic code indicating the TCM has detected a fault. While a failing TCM is a very common cause, this code can also be triggered by other issues. However, if the P0700 is accompanied by communication codes or other internal module fault codes, replacing the TCM is the correct repair.
How do I know if I have a T42 TCM?
The T42 module was used on most 4-speed automatic transmissions (4L60E, 4L65E, 4L70E) in this era. The module is located externally in the engine bay, not inside the transmission pan like older designs. Verifying the part number on your original module is the best way to confirm.