Restore Smooth, Reliable Shifting to Your GMC Savana
Is your 2006-2014 GMC Savana 2500 experiencing harsh shifting, getting stuck in gear, or displaying a check engine light with transmission codes? These are classic signs of a failing Transmission Control Module (TCM). The TCM is the electronic brain of your automatic transmission, responsible for managing shift points, torque converter clutch engagement, and fluid pressure. When it fails, it can lead to poor performance, decreased fuel economy, and potentially catastrophic transmission damage if left unaddressed. This genuine GM T42 TCM, service part number 24235340, is the definitive solution to restore your vehicle’s factory performance.
From the Diagnostic Bay
We had a 2011 Savana 2500 work van come into the shop with a complaint of intermittent harsh 1-2 shifts and a P0700 code. The owner had already spent money at another shop replacing a shift solenoid, but the problem persisted. After a quick scan, we saw erratic data from the TCM. Instead of chasing ghosts by throwing more hard parts at it, we identified the root cause: the original module was failing. We installed one of our VIN-programmed T42 modules. The installation took less than 30 minutes, and after clearing the codes, the van shifted perfectly on the test drive. The customer was back on the road making money, having avoided a costly and unnecessary transmission rebuild.
Is Your Savana 2500 Transmission Module Failing?
A faulty TCM can manifest in various ways, often mimicking mechanical transmission problems. Before condemning your transmission, check for these common electronic symptoms. A failing module is often the culprit behind these frustrating issues.
- ✔ Erratic Shifting: Experiencing sudden harsh shifts, delayed gear engagement, or a feeling of the transmission slipping between gears.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to protect the transmission from further damage.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): Common codes include P0700 (Transmission Control System Malfunction) or specific solenoid codes like P0750, P0753, etc.
- ✔ No Shifting: Complete failure to upshift or downshift, making the vehicle difficult to drive.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter operation can lead to a noticeable drop in MPG.
The Plug-and-Play Solution: VIN Programmed for Your Vehicle
Forget the hassle and expense of a dealership visit. This T42 Transmission Control Module arrives at your door pre-programmed to your Savana’s specific Vehicle Identification Number (VIN). This critical step ensures that the module has the latest GM software and is perfectly calibrated for your vehicle’s engine, transmission (4L60E, 4L80E, etc.), and tire size. This eliminates compatibility issues and allows for a true plug-and-play installation. Simply provide your VIN at checkout, and we handle the rest.
Key Features & Benefits:
- VIN-Programmed: No additional programming required. Install the module, connect the battery, and drive away with confidence.
- OEM Quality: Built to stringent General Motors standards for reliability and long-term durability, ensuring it performs like the original part.
- Restores Performance: Corrects shifting problems, eliminates fault codes, and restores the smooth operation you expect from your transmission.
- Cost-Effective Repair: A direct and affordable solution that saves you from expensive dealership labor and diagnostic fees.
- No Core Charge: Keep your old part. There are no core charges or hassles with returning the old module.
Simple Installation for DIYers and Professionals
Replacing the TCM on a 2006-2014 Savana 2500 is a straightforward job. The module is typically located in the engine compartment on the right-hand (passenger) side. The process generally takes less than 30 minutes.
- Safety First: Disconnect the negative terminal of your vehicle’s battery.
- Locate the TCM: Find the module in the engine bay. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully unplug the electrical connectors and unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, VIN-programmed TCM in place and securely re-attach the electrical connectors.
- Final Steps: Reconnect the battery terminal. It is recommended to use a scan tool to clear any stored DTCs from the vehicle’s memory to complete the process.
Frequently Asked Questions
Why is VIN programming necessary for this module?
VIN programming loads your vehicle’s specific software and calibrations onto the module. This ensures it communicates correctly with the Engine Control Module (ECM) and other vehicle systems, controlling shift points and pressures precisely as the manufacturer intended. Without it, the transmission will not function correctly.
Will this fix a P0700 diagnostic trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. While this module often resolves the root cause that triggers a P0700, it’s essential to scan for other specific codes (like solenoid or sensor codes) to confirm the TCM is the issue. In many cases, a faulty TCM is the source of these codes.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills and tools, this is a very manageable installation. The module is easily accessible in the engine bay, and the process involves unplugging connectors and removing a few bolts. The pre-programming makes the electronic side of the job completely plug-and-play.
What is the difference between a TCM and an ECM?
The TCM (Transmission Control Module) is a dedicated computer that controls only the functions of the automatic transmission. The ECM (Engine Control Module) manages the engine’s operations. The two modules communicate constantly to ensure smooth and efficient vehicle operation.
Do I have to return my old TCM?
No, there is no core charge for this part. You can keep your old module, which saves you the time, cost, and hassle of shipping a core back.