Restore Peak Transmission Performance to Your Savana 1500
Is your 2006-2014 GMC Savana 1500 suffering from erratic 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 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 potential damage to your transmission. This genuine GM T42 TCM, service part number 24256960, is the definitive solution to restore your vehicle’s drivability and reliability.
From the Diagnostic Bay
We had a 2011 Savana 2500 work van come into the shop with a classic complaint: “It slams into gear and sometimes won’t shift past second.” The driver mentioned they had already replaced two shift solenoids based on trouble codes, but the problem persisted. A quick scan showed a P0700 (Transmission Control System Malfunction) and intermittent solenoid circuit codes. Instead of throwing more parts at it, we tested the TCM’s communication and power. We found erratic voltage readings at the module’s connector. The internal circuitry of the original TCM was failing, causing it to send faulty commands to perfectly good solenoids. Installing a VIN-programmed T42 module like this one resolved all the codes and restored the van’s smooth shifting in under an hour. It’s a reminder that the controlling module is often the root cause, not just the components it controls.
Common Symptoms of a Failing GM T42 TCM
- ✔ Harsh or Delayed Shifting: Experiencing hard bangs when shifting between gears or a noticeable lag after moving the shifter from Park to Drive or Reverse.
- ✔ Stuck in Limp Mode: The vehicle refuses to shift out of a single gear (often 2nd or 3rd) to prevent further transmission damage.
- ✔ Warning Lights: The Check Engine Light or a dedicated transmission warning light is illuminated on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs): You may find codes such as P0700, P0750, P0751, P0753, or other solenoid-specific codes stored in the vehicle’s computer.
- ✔ No Upshifting or Downshifting: The transmission fails to shift to higher or lower gears as vehicle speed changes.
- ✔ Poor Fuel Economy: Inefficient shifting and torque converter operation can lead to a sudden drop in your vehicle’s MPG.
The Definitive Solution: A Programmed Savana 1500 Transmission Module
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership. This T42 TCM is the smart, efficient solution for your Savana 1500 Transmission Module replacement. We pre-program the unit to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures that the module is loaded with the latest GM software updates and is perfectly calibrated for your van’s specific transmission (4L60E, 4L65E, 4L70E), engine, and tire size. This plug-and-play approach eliminates the need for additional programming tools or dealer intervention, saving you time and money.
Key Features & Benefits:
- VIN-Programmed for Your Van: Arrives ready for immediate installation with no extra programming required. It’s a true plug-and-play fix.
- OEM-Quality Construction: Built to meet or exceed General Motors’ strict standards for durability and performance, ensuring a long service life.
- Resolves Common Issues: Directly addresses problems like harsh shifting, DTCs, and limp mode caused by a faulty original module.
- Broad Compatibility: While perfect for your Savana, this module also interchanges with numerous part numbers, including 24252114, 24234503, and 24242391, fitting a wide array of GM trucks, vans, and cars.
- No Core Charge: Keep your old part. There’s no need to worry about the cost and hassle of returning a core.
Installation Guide
Replacing the TCM on a 2006-2014 Savana 1500 is a straightforward process. The module is typically located in the engine compartment on the right-hand (passenger) side. You will need basic hand tools. Before you begin, always disconnect the negative battery terminal to prevent electrical damage and help reset the vehicle’s electronic systems. Simply unbolt the old module, carefully disconnect the wiring harnesses, and install the new unit in its place. Once installed, reconnect the battery. While the module is pre-programmed, it is always best practice to use a scan tool to clear any old fault codes from the system’s memory. The entire job can usually be completed in under 30 minutes.
Frequently Asked Questions
Is this part ready to install out of the box?
Yes. This Transmission Control Module is pre-programmed to your vehicle’s VIN before shipping. This makes it a true plug-and-play solution, requiring no additional programming or trips to the dealership for setup.
Will this 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 fix the underlying cause that triggers a P0700, it’s essential to diagnose the specific codes stored within the TCM itself (e.g., solenoid circuit codes) to confirm the TCM is the point of failure.
Where is the TCM located on my 2006-2014 Savana 1500?
On the GMC Savana and Chevrolet Express vans from this era, the Transmission Control Module is almost always located in the engine compartment on the right-hand (passenger) side, often mounted near the battery or on the firewall.
Do I need to return my old TCM?
No, there is no core charge for this part. You can keep, discard, or recycle your old module without any additional fees or hassle.
What is the difference between a TCM and an ECU/PCM?
The TCM (Transmission Control Module) specifically controls the functions of the automatic transmission. The ECU (Engine Control Unit) or PCM (Powertrain Control Module) is the main computer that manages engine functions. In many modern vehicles, these functions are integrated, but for this generation of GM vehicles, the TCM is a separate, dedicated computer for the transmission.