Is your 2006-2014 GMC Savana 3500 experiencing erratic shifting, getting stuck in gear, or showing transmission-related warning lights? These are classic signs of a failing Transmission Control Module (TCM). Restore your van’s performance and reliability with this direct-fit, VIN-programmed T42 TCM. As the brain of your automatic transmission, this module is responsible for executing precise gear changes, managing torque converter lockup, and ensuring the overall health of your drivetrain. A faulty TCM can lead to poor fuel economy, premature transmission wear, and an unsafe driving experience.
This module is a dependable solution, built to meet or exceed original equipment specifications. It arrives pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive and time-consuming dealership visits for programming. This plug-and-play design ensures that once installed, your vehicle’s computer systems will communicate seamlessly, restoring the smooth and predictable shifting you expect from your Savana’s 4L80E or other compatible 4-speed automatic transmission.
Expert Pro Tip
Before installing your new TCM, always disconnect the vehicle’s battery. After installation, inspect the wiring harness connectors for any signs of corrosion, bent pins, or damage. A poor connection can mimic the symptoms of a failed module. Once connected, use a diagnostic scan tool to clear any stored Diagnostic Trouble Codes (DTCs) from the system to ensure a clean reset.
Symptoms of a Failing 2006-2014 Savana 3500 TCM
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ Vehicle enters “limp mode,” often stuck in 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Common trouble codes like P0700 (Transmission Control System Malfunction) or solenoid-specific codes (P0750, P0751, etc.).
- ✔ Failure to upshift or downshift properly.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Intermittent loss of communication with the module, causing erratic behavior.
This T42 TCM is the definitive fix for these issues. By replacing your old, malfunctioning unit with our VIN-programmed module, you are installing a component loaded with the latest GM software updates for your specific vehicle. This ensures optimal performance and longevity. This part is also a direct replacement for a wide range of service numbers, including 24242391, 24234503, 24252114, and many others, making it a versatile solution for numerous GM trucks, vans, and SUVs from this era. Installation is straightforward for a DIY mechanic or professional technician, typically located in the engine compartment on the RH side for the Savana 3500, allowing you to get your work van back on the road quickly.
Frequently Asked Questions
Is this transmission control module ready to install out of the box?
Yes, it is. Each module is pre-programmed to the specific Vehicle Identification Number (VIN) you provide at checkout. This ensures it communicates correctly with your Savana’s engine computer and other systems for a true plug-and-play installation.
Where is the TCM located on my 2006-2014 Savana 3500?
On the GMC Savana 2500 and 3500 vans from 2006 to 2014, the TCM is typically found in the engine compartment, mounted on the right-hand (passenger) side.
Will this part fix a P0700 diagnostic 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 a faulty TCM can cause a P0700, this code is often accompanied by other, more specific codes. This module will resolve the issue if the TCM itself is the source of the fault.
Is there a core charge for my old part?
No, there is no core charge associated with this part. You can keep your old module without needing to send it back, saving you time and hassle.
What transmissions is this T42 module compatible with?
This T42 TCM is designed for vehicles equipped with GM’s 4-speed automatic transmissions, including the popular 4L60E, 4L65E, 4L70E, and 4L80E models common in this generation of GM trucks and vans.