Restore Your Van’s Performance with a Programmed Transmission Control Module
Is your 2006-2014 GMC Savana 1500 experiencing frustrating transmission problems like harsh shifting, getting stuck in gear, or a persistent check engine light? 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 and ensuring smooth, efficient operation. When it fails, it can cripple your van’s performance and reliability. This OEM-quality T42 TCM, service part number 24234503, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
Diagnosing a Faulty Savana 1500 Transmission Module
A failing TCM can manifest in several ways, often mimicking internal transmission failure. Before considering a costly transmission rebuild, it’s crucial to evaluate the module itself. The electronic components within the TCM are subjected to constant heat and vibration, which can lead to internal circuit failure over time. This can cause intermittent or complete loss of communication between the engine and transmission, resulting in poor drivability and confusing diagnostic codes. If your Savana is exhibiting any of the symptoms below, a faulty TCM is the most likely culprit.
From the Diagnostic Bay
We recently had a 2011 Savana 2500 work van come into the shop. The owner was convinced his 4L80E transmission was shot. It was slamming into gear and would randomly go into limp mode, stuck in 3rd gear. He had already spent hundreds replacing the internal wiring harness and solenoids with no change. After a quick scan, we saw a P0700 code and several solenoid communication errors. Instead of pulling the transmission, we checked the TCM. We installed one of our VIN-programmed T42 modules, and within 30 minutes, the van was shifting perfectly. The owner was thrilled to have saved thousands on an unnecessary transmission overhaul—a classic case of the brain, not the muscle, being the problem.
Common Symptoms of a Bad TCM
- ✔ Harsh, erratic, or delayed gear shifts that make driving unpredictable.
- ✔ Vehicle suddenly enters ‘limp mode,’ often stuck in 2nd or 3rd gear, with limited power.
- ✔ The Check Engine Light or a specific transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic scans reveal trouble codes such as P0700, P0750, or other solenoid-related faults.
- ✔ Complete failure to upshift or downshift, leading to poor acceleration and high RPMs.
- ✔ A noticeable decrease in fuel efficiency as the transmission operates incorrectly.
- ✔ Intermittent electrical problems that seem to have no other source.
The Critical Advantage of VIN Programming
Don’t settle for a generic, off-the-shelf module that requires an expensive trip to the dealership for programming. Our process sets this part apart. We flash the module with the latest GM software updates and calibrate it specifically to your van’s VIN. This ensures that it communicates flawlessly with your vehicle’s other computers, like the Engine Control Module (ECM) and Body Control Module (BCM), right out of the box. This tailored programming optimizes shift points, torque converter lockup, and fuel efficiency for your exact vehicle configuration, providing a level of precision that generic modules simply cannot match. This is the most reliable way to fix your transmission issues permanently and avoid compatibility problems.
This module is a direct replacement for a wide range of GM vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, 4L70E, and 4L80E. It is interchangeable with numerous part numbers, including 24252114, 24234503, 24230461, 24234274, and more, making it a versatile solution for your repair needs.
Frequently Asked Questions
Why is VIN programming necessary for this TCM?
VIN programming loads your vehicle’s specific software and calibrations onto the module. This ensures it works seamlessly with your engine, options, and other electronics. Without it, the transmission may not shift correctly, or the vehicle may not start at all.
Do I need to take my Savana to a dealer after installation?
No. Because this module comes pre-programmed to your VIN, no further dealership programming or relearn procedures are required. It is a true plug-and-play installation, saving you time and money.
Where is the TCM located on a 2006-2014 Savana 1500?
On the GMC Savana and Chevrolet Express vans from this era, the Transmission Control Module is typically located in the engine compartment on the right-hand (passenger) side.
What is the warranty on this transmission module?
This part is backed by our comprehensive one-year warranty, giving you peace of mind and confidence in your repair.
Will this fix a P0700 diagnostic trouble code?
A P0700 code is a general transmission fault request from the TCM to the ECM to turn on the check engine light. While this module often resolves the underlying issue causing the P0700, it’s important to scan for other specific P-codes (like P0751, P0756, etc.) to confirm the TCM is the root cause.