Restore Peak Transmission Performance
Is your 2006-2014 GMC Savana 2500, or another GM vehicle, suffering from erratic shifting, delayed gear engagement, or getting stuck in limp mode? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the brain of your automatic transmission, responsible for orchestrating every gear change, managing torque converter lockup, and monitoring system health. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage. This OEM-quality GM T42 TCM, service part number 24234274, is the definitive solution to restore your vehicle’s smooth and reliable operation.
From the Diagnostic Bay
We had a 2008 Silverado 1500 towed in that was stuck in third gear. The owner had already replaced two shift solenoids based on a generic P0758 code, but the problem persisted. Our diagnostics pointed straight to the TCM. The internal drivers for the solenoids had failed, a common issue in these T42 modules. Instead of chasing individual codes, addressing the root cause with a properly programmed TCM is key. This VIN-programmed unit would have saved him hundreds in unnecessary parts and labor by fixing the core issue the first time.
Symptoms of a Failing GM T42 TCM
A faulty TCM can manifest in various ways, often mimicking mechanical transmission problems. If you’re experiencing any of the following issues, your TCM is the likely culprit. Replacing it can prevent further wear on your transmission’s mechanical components.
- ✔ Harsh, slamming, or unpredictable gear shifts.
- ✔ The vehicle feels stuck in one gear (limp mode) and won’t upshift or downshift.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on the dash.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related codes are present.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ A noticeable drop in fuel efficiency.
- ✔ Complete loss of communication with the transmission module.
The Critical Advantage: VIN Programming Included
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership. This T42 TCM comes pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This crucial step ensures 100% compatibility and plug-and-play installation. We load the latest GM software and calibrations directly onto the module before it ships. This means the TCM will correctly communicate with your vehicle’s Engine Control Module (ECM) and other systems right out of the box, ensuring optimal shift points, torque converter strategy, and overall performance. No additional programming or setup is required.
Easy Installation for DIYers and Professionals
Designed for a straightforward installation, this module can typically be replaced in under 30 minutes. Its location varies by model but is generally accessible in the engine compartment—often near the battery, on the LH strut tower, or under the air cleaner box. Simply disconnect the vehicle’s battery, unplug the electrical connectors from the old module, unbolt it, and install the new one in its place. Reconnect the battery, and you’re ready to go. We recommend using a basic scan tool to clear any stored DTCs after installation for a clean slate.
This module is a direct replacement for a wide range of part numbers, including 24252114, 24234503, 24230461, 24235340, and many more, making it a versatile solution for countless GM cars, trucks, and SUVs. Built to stringent OEM standards and backed by a one-year warranty, you can drive with confidence knowing your transmission is in good hands.
Frequently Asked Questions
What does the T42 Transmission Control Module do?
The T42 TCM is an electronic computer that acts as the central command for your automatic transmission. It receives data from various sensors (like vehicle speed and engine RPM) and uses it to control shift solenoids, pressure control solenoids, and the torque converter clutch, ensuring smooth and efficient gear changes.
Why is VIN programming so important for this part?
VIN programming loads your vehicle’s specific software and calibration files onto the module. Without it, the TCM won’t know the correct transmission type, gear ratios, or tire size, leading to incorrect shifting, error codes, and potentially no operation at all. Our pre-programming service eliminates the need for expensive dealership tools and labor.
Will this module fix a P0700 trouble code?
A P0700 code is a general fault code indicating that the TCM has detected a problem and has requested the Check Engine Light to be turned on. While this module can resolve the underlying issue causing the P0700 (like a failed solenoid driver), you should always diagnose the specific codes stored within the TCM itself (e.g., P0753) to confirm the TCM is the root cause.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills, this is a very straightforward installation. It typically involves disconnecting the battery, unplugging a few electrical connectors, and removing a few bolts. The module is usually located in an accessible part of the engine bay. No special tools are required.
Do I need to return my old TCM (core charge)?
No, there is no core charge associated with this part. You can keep your old module, which saves you the time, cost, and hassle of packaging and shipping it back.