Restore Your Savana’s Shifting Performance and Reliability
As a technician with over two decades of experience, I know that for a workhorse like the 2006-2014 GMC Savana 1500 Van, transmission problems mean downtime and lost income. If your van is suffering from erratic shifting, getting stuck in gear, or throwing transmission codes, the culprit is often a failing Transmission Control Module (TCM). This replacement T42 TCM, part number 24256960, is the definitive solution to get your vehicle operating smoothly and reliably again, without a costly and time-consuming trip to the dealership.
This isn’t just a replacement part; it’s a complete, ready-to-install fix. We pre-program the module to your van’s specific Vehicle Identification Number (VIN) before it ships. This crucial step ensures that the TCM communicates perfectly with your van’s engine computer (ECM) and other systems, using the latest GM software updates. The result is restored shift patterns, proper torque converter lockup, and accurate diagnostic reporting, solving the root cause of many frustrating transmission issues.
Case Study: A Tricky Diagnosis
A local contractor brought in his 2011 Savana 1500, complaining of intermittent harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode), especially on hot days. His scanner showed a generic P0700 code and a specific solenoid performance code that would come and go. He had already replaced two shift solenoids with no improvement. After reviewing the symptoms, I suspected the T42 TCM. Heat soak can cause internal circuit failures in these modules, leading to exactly these kinds of intermittent electrical faults. We installed one of our VIN-programmed TCMs, and the problem was solved instantly. He was back on the road in under an hour, saving hundreds in what could have been a wild goose chase of replacing more internal transmission parts.
Is Your Savana’s Transmission Sending These Signals?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ The vehicle is stuck in “limp mode,” refusing to shift out of 2nd or 3rd gear.
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700, P0750, P0751, or other solenoid-related DTCs.
- ✔ Inconsistent upshifting or downshifting, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy or signs of the transmission overheating.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
Replacing the TCM on your Savana is a job most DIYers can handle in their own driveway. For the Savana and Express vans, the module is typically located in the engine compartment on the right-hand (passenger) side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and help reset the system.
- Locate the TCM: Find the module on the RH side of the engine bay. It will have several large electrical connectors attached.
- Disconnect and Remove: Carefully unplug the wiring harnesses. Note the locking tabs to avoid damage. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the wiring harnesses.
- Final Steps: Reconnect the battery terminal. While the module is plug-and-play, it’s good practice to use a basic scan tool to clear any stored fault codes from the vehicle’s memory. Start the engine and test drive to confirm smooth shifting.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for part number 24256960 and is interchangeable with many other service numbers. It is designed for a wide range of 2006-2014 General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. While this page is focused on the 2006-2014 Savana 1500 TCM, it also fits:
- GMC: Savana/Express 1500/2500/3500 (06-14), Sierra, Yukon, Envoy, Canyon
- Chevrolet: Silverado, Tahoe, Suburban, Avalanche, Express, Impala, Cobalt, HHR, Colorado
- Buick: LaCrosse, Lucerne, Rainier, Rendezvous
- Cadillac: DTS
- Pontiac: G6, Grand Prix, G5
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
Please verify your specific model and year in the fitment chart or contact us with your VIN to ensure 100% compatibility.
Frequently Asked Questions
What does ‘VIN Programmed’ mean?
It means we load your vehicle’s specific VIN into the module before shipping. This ensures it works correctly with your van’s factory settings for shift points, engine parameters, and options, eliminating the need for dealership programming.
Do I need any special tools to install this?
No special tools are required. Basic hand tools like a socket set to remove the mounting bolts and a small screwdriver for the connector tabs are all you should need. The installation process is designed to be straightforward.
Will this fix a P0700 transmission code?
A P0700 is a generic code indicating the TCM has detected a fault. Often, the fault is within the TCM itself. If the TCM is the source of the problem, replacing it with our pre-programmed unit will resolve the P0700 and any related specific codes.
My old part has a different number on it. Will this still work?
Yes, GM uses many different part numbers for the same component over the years. This module, 24256960, is a service replacement for numerous earlier part numbers like 24252114, 24234503, and others. Our programming ensures it functions correctly in place of those older versions.
Is there a core charge?
No, there is no core charge. You are not required to send your old, faulty module back to us, saving you time and return shipping costs.