Restore Peak Transmission Performance in Your GM Vehicle
Is your 2006-2014 Chevrolet Express 1500 or other 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 electronic 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 T42 Transmission Control Module, service part number 24234274, is the definitive solution to restore your vehicle’s smooth and reliable operation.
From the Diagnostic Bay
We had a 2011 Chevy Express 1500 work van come into the shop that the owner described as ‘possessed’. It would shift hard from 1st to 2nd, then sometimes refuse to shift out of 3rd gear on the highway. The check engine light was on, and a scan revealed a P0700 (Transmission Control System Malfunction) and several solenoid performance codes. After checking the wiring harness and fluid, we identified the internal circuitry of the original TCM as the culprit. We installed one of our VIN-programmed T42 modules. The installation took less than 20 minutes, and after clearing the codes, the van drove like it just left the factory. The customer was back on the road making deliveries the same afternoon, without a costly trip to the dealership.
Symptoms of a Failing Express 1500 Transmission Module
A faulty TCM can manifest in various ways, disrupting your vehicle’s drivability. If you’re experiencing any of the following issues, it’s highly likely your TCM is the source of the problem. Replacing your Express 1500 Transmission Module can resolve these common symptoms:
- ✔ Harsh, erratic, or delayed gear shifts that make driving uncomfortable and unpredictable.
- ✔ The vehicle enters ‘limp mode,’ getting stuck in a single gear (usually 2nd or 3rd) to prevent further damage.
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, P0753, P0758, or other solenoid-related codes are stored in the computer.
- ✔ Complete failure 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.
Key Features & Benefits
This module isn’t just a replacement part; it’s a comprehensive solution designed for longevity and ease of installation.
- ✔ VIN Programmed for Your Vehicle: We pre-program this module to your vehicle’s specific VIN, ensuring it arrives ready for plug-and-play installation. This eliminates the need for expensive dealership programming or specialized scan tools.
- ✔ Direct OEM-Quality Fit: Engineered to meet or exceed original equipment specifications, this T42 TCM guarantees a perfect fit and seamless communication with your vehicle’s powertrain control module (PCM) and other systems.
- ✔ Restores Smooth Operation: By precisely controlling shift points and hydraulic pressure, this module eliminates harsh shifting and restores the smooth, responsive feel your vehicle had when it was new.
- ✔ Broad Compatibility: This module is a direct replacement for a wide range of part numbers, including 24252114, 24234503, 24230461, and more, making it suitable for numerous GM models equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
- ✔ No Core Charge: Keep your old part without the hassle or expense of returning a core. This simplifies the process and saves you money.
Frequently Asked Questions
Do I need to take my vehicle to a dealer for programming?
No. This module comes pre-programmed to your vehicle’s VIN. It is ready to be installed right out of the box, saving you time and the high cost of dealership programming services.
Where is the Express 1500 Transmission Module located?
On the 2006-2014 Chevrolet Express and GMC Savana vans, the TCM is typically located in the engine compartment on the right-hand (passenger) side. Always consult a service manual for your specific vehicle to confirm the exact location before beginning installation.
Will this fix my P0700 trouble code?
A P0700 code is a general transmission fault code, indicating that the TCM has detected a problem. While a faulty TCM is a very common cause, this code can also be triggered by other issues. However, if you’re experiencing shifting problems along with the P0700 code, replacing the TCM is the most likely solution.
Is this part difficult to install?
For someone with basic mechanical skills, the installation is straightforward and typically takes under 30 minutes. It involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then installing the new one in its place. Reconnect everything, and you’re done.
What transmissions is this T42 TCM compatible with?
This module is designed for vehicles equipped with popular GM 4-speed automatic transmissions, including the 4L60E, 4L65E, 4L70E, and 4L80E. It fits a wide range of trucks, vans, and cars from Chevrolet, GMC, Buick, Cadillac, Pontiac, and more from 2006-2014.