Is Your GM Vehicle Experiencing Transmission Problems?
If your GMC Savana, Chevrolet Express, Silverado, or other GM vehicle is suffering from harsh shifting, delayed gear engagement, or has a check engine light with transmission-related codes, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the electronic brain of your automatic transmission, responsible for orchestrating every shift with precision. When it fails, it can lead to poor performance, decreased fuel economy, and even leave you stranded. This genuine GM T42 Transmission Control Module, part number 24239926, is the definitive solution to restore your transmission’s factory performance and reliability.
From the Diagnostic Bay
We had a 2011 Chevrolet Silverado 1500 come into the shop with the classic symptoms: the transmission was stuck in third gear (limp mode), and the check engine light was on. The owner was worried about a costly transmission rebuild. A quick scan revealed code P0700 (Transmission Control System Malfunction) and several solenoid circuit codes. Instead of jumping to conclusions, we checked the TCM connections first. Everything was secure. We knew from experience that these T42 modules are a common failure point. After installing one of our VIN-programmed units, we cleared the codes and took it for a test drive. The truck shifted perfectly through all gears, the check engine light stayed off, and the customer was back on the road for a fraction of the cost of a new transmission. It’s a textbook example of how a targeted electronic component replacement can solve major drivability issues.
Key Symptoms and Part Features
- ✔ VIN Programmed for Your Vehicle: This module arrives pre-flashed with your vehicle’s specific VIN and the latest GM software updates. This ensures 100% compatibility and eliminates the need for expensive dealership programming.
- ✔ Plug-and-Play Installation: Because it’s programmed for your vehicle, installation is a direct swap. Simply disconnect the old module, connect the new one, and you’re ready to go.
- ✔ Restores Smooth Shifting: Corrects issues like harsh upshifts, delayed downshifts, gear slipping, and erratic shift patterns, bringing back the smooth operation you expect.
- ✔ Clears Common DTCs: A new, properly functioning TCM is the direct fix for many diagnostic trouble codes, including P0700, P0750, and various solenoid-specific faults.
- ✔ Eliminates Limp Mode: Resolves the frustrating issue of being stuck in a single gear, restoring full access to your transmission’s range.
- ✔ OEM-Quality Construction: Built to meet or exceed General Motors’ strict specifications for durability and performance, ensuring a long service life.
- ✔ No Core Charge: Keep your old part without the hassle or expense of a core return, simplifying your repair process.
Why Choose Our Programmed Savana 3500 Transmission Module?
When you’re dealing with a complex electronic component like the TCM, the details matter. Our process ensures that the Savana 3500 Transmission Module you receive is not just a replacement part, but a comprehensive solution. We use your vehicle’s VIN to load the precise factory calibration files, which control shift points, torque converter lockup strategy, and communication with the Engine Control Module (ECM). This tailored programming is critical for the 4L60E, 4L65E, 4L70E, and 4L80E transmissions found in these vehicles, guaranteeing optimal performance and fuel efficiency right out of the box.
Installation and Compatibility Information
Installing this T42 TCM is a straightforward process for a DIY mechanic or any professional technician. The module is typically located in the engine compartment for easy access. Depending on your specific model (e.g., Savana, Tahoe, Impala), you may find it on the RH or LH side, next to the battery, or under the air cleaner box. The entire process usually takes less than 30 minutes.
Installation Steps:
- Disconnect the Battery: Always disconnect the negative battery terminal before working on any vehicle electronics to prevent shorts and reset the system.
- Locate and Remove the Old TCM: Unplug the electrical connectors and unbolt the module from its mounting location.
- Install the New TCM: Mount the new module securely and firmly reconnect the electrical harnesses.
- Reconnect the Battery: Reattach the negative battery terminal.
- Clear Codes: While not always necessary, it’s good practice to use a scan tool to clear any stored transmission codes after installation.
This module is a direct replacement for a wide range of service numbers, including: 24252114, 24234503, 24230461, 24234274, 24239926, 24256960, and many more, making it a versatile fix for dozens of GM cars, trucks, and SUVs from 2006 to 2014.
Frequently Asked Questions
What is a T42 TCM and what does it do?
The T42 Transmission Control Module (TCM) is a small computer that acts as the brain for your automatic transmission. It receives data from various sensors on the engine and transmission to control shift solenoids, regulate hydraulic pressure, and manage torque converter lockup, ensuring smooth and efficient gear changes.
Is this part difficult to install?
No, this is one of the easier electronic modules to replace. It is typically located in the engine bay and requires only basic hand tools. Because our modules come VIN-programmed, it’s a simple plug-and-play installation that takes under 30 minutes for most models.
What does “VIN Programmed” mean for me?
“VIN Programmed” means we load the module with the specific software calibration for your exact vehicle using your Vehicle Identification Number (VIN). This makes the part ready to install out of the box, without requiring a trip to the dealership for expensive programming or flashing.
Will this fix a P0700 trouble 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 a faulty TCM itself can cause a P0700, it’s often accompanied by other, more specific codes. Replacing a failing TCM is a very common and effective fix for a P0700 and related transmission codes.
Do I need to send my old part back?
No, there is absolutely no core charge for this part. You can keep, discard, or recycle your old module without any additional cost or hassle, making the repair process simpler and more affordable.