Restore Peak Transmission Performance in Your GM Truck or SUV
Is your 2007-2013 GMC Sierra 1500 suffering from erratic shifting, getting stuck in gear, or displaying a check engine light with transmission codes? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and monitoring system health. When it fails, drivability is compromised, leading to frustrating and potentially damaging performance. This genuine OEM-quality T42 TCM, service number 24239926, is the definitive solution to restore the smooth, reliable operation you expect from your vehicle.
From the Diagnostic Bay
We recently had a 2008 Silverado in the shop with classic symptoms: harsh 1-2 shifts and an intermittent P0752 (Shift Solenoid ‘A’ Stuck On) code. The owner had already spent a few hundred dollars replacing the solenoid pack inside the transmission pan, but the problem persisted. After a quick diagnostic, we identified the root cause: a faulty TCM was sending incorrect signals to the new solenoid. A quick swap with one of our VIN-programmed T42 modules solved the issue instantly. The customer was back on the road in under an hour, wishing he had replaced the module first. Don’t chase ghosts in the transmission; often, the problem lies with the controller itself.
Symptoms of a Failing Sierra 1500 Transmission Module
A malfunctioning TCM can manifest in various ways, often being misdiagnosed as an internal transmission failure. Before considering a costly transmission rebuild, check if your vehicle is exhibiting any of these common symptoms. Replacing a faulty Sierra 1500 Transmission Module can often be a simple, effective fix.
- ✔ Harsh, delayed, or erratic gear shifts that make driving uncomfortable.
- ✔ The vehicle enters a fail-safe or “limp mode,” often stuck in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) are stored, such as P0700, P0750, P0755, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration and high RPMs.
- ✔ A noticeable decrease in fuel efficiency as the transmission operates inefficiently.
- ✔ The transmission may feel like it’s slipping between gears or failing to engage properly.
The Plug-and-Play Advantage: Pre-Programmed for Your VIN
Forget expensive trips to the dealership for programming. Our key advantage is that we flash this module with the latest GM software updates specifically for your vehicle’s Vehicle Identification Number (VIN) before it ships. This ensures that the TCM communicates perfectly with your engine computer (ECU) and other vehicle systems right out of the box. This VIN-specific programming optimizes shift points, torque converter strategy, and pressure controls for your exact application, guaranteeing a seamless, plug-and-play installation. This is the most critical step for a successful repair, and we handle it for you.
This module is a direct replacement and cross-references with numerous part numbers, including 24252114, 24234503, 24230461, 24239926, 24256960, and more, making it a versatile solution for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
Frequently Asked Questions
What is VIN programming and why do I need it?
VIN programming loads your vehicle’s specific software onto the Transmission Control Module. This ensures the TCM has the correct shift strategies, pressure settings, and communication protocols for your exact engine, axle ratio, and tire size. Without it, the transmission will not function correctly, and you’ll likely have warning lights and poor performance.
Do I need to visit a dealer after installing this part?
No. Because this module arrives pre-programmed to your VIN, no further dealership programming or relearn procedures are required. It is designed for a direct, plug-and-play installation, saving you time and money.
Where is the TCM located on my 2007-2013 Sierra 1500?
On most 2007-2013 GMC Sierra and Chevrolet Silverado trucks, the T42 TCM is conveniently located in the engine compartment, typically mounted next to the battery on a dedicated bracket. This makes for a quick and easy replacement that usually takes less than 30 minutes.
Will this module fix my P0700 transmission code?
A P0700 code is a general fault code indicating the TCM has detected a problem and requested the Check Engine Light to be turned on. While this module can resolve the underlying issue causing the P0700 (like a faulty solenoid driver), it’s important to have the specific codes read from the TCM itself (e.g., P0752, P0757) to confirm the diagnosis. In many cases, a failing TCM is the root cause.
Is there a core charge for this part?
No, we do not require a core charge. You can keep your old module without the hassle of returning it, making the process simpler and more convenient for you.