If the once-seamless gear changes in your 2006-2011 Cadillac DTS have become harsh, unpredictable, or are causing a check engine light, you’re likely dealing with a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, a faulty TCM can make your luxury sedan feel unreliable and frustrating to drive. This T42 TCM, part number 24256960, is the definitive, hassle-free solution. It arrives expertly programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and ensuring a perfect, plug-and-play installation.
Case Study: A Tricky Diagnosis
A customer brought in their ’08 Cadillac DTS with classic symptoms: it would slam into gear from a stop and sometimes get stuck in 3rd gear (limp mode). They were worried about a multi-thousand-dollar transmission rebuild. After connecting my scan tool, I saw a generic P0700 code, but more importantly, intermittent communication loss with the TCM. Instead of shotgunning parts, we checked the wiring—it was fine. The issue was internal to the module itself, a common failure point I’ve seen on hundreds of these GM platforms due to heat cycles and vibration. Installing one of our pre-programmed TCMs resolved all the shifting issues in under 30 minutes, saving the customer a massive repair bill and a trip to the dealer.
Is Your Cadillac DTS Showing These Transmission Problems?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Harsh, jerky, or delayed gear shifts that disrupt your smooth ride.
- ✔ The vehicle gets stuck in a single gear, often called “limp mode,” to protect the transmission.
- ✔ An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) stored in the system, such as P0700 (Transmission Control System Malfunction), P0750-P0758 (Shift Solenoid Faults), or U-codes indicating communication loss.
- ✔ A noticeable decrease in fuel economy as the transmission operates inefficiently.
- ✔ Inability to shift into certain gears or complete transmission failure.
A Straightforward Guide to Installation
One of the best features of this module is its simple, DIY-friendly installation. You don’t need specialized tools or a professional lift. For the 2006-2011 Cadillac DTS, the TCM is conveniently located in the engine bay.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the system.
- Locate the TCM: On your DTS, you’ll find the module in the right-hand (passenger side) front of the engine compartment. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unplug the electrical harnesses from the old module. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical harnesses, ensuring they click securely into position.
- Final Steps: Reconnect the negative battery terminal. While the module is plug-and-play, it’s good practice to use a basic OBD2 scan tool to clear any old fault codes from the vehicle’s memory. Start the car and enjoy your restored shifting performance!
Verified Vehicle Compatibility
This module is a direct replacement for part number 24256960 and is interchangeable with a wide range of other GM service numbers. While this page is focused on the 2006-2011 DTS TCM, it also fits many other vehicles. Please see the comprehensive list below to confirm your application.
Frequently Asked Questions
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit Vehicle Identification Number (VIN) and the latest GM-approved software onto the module before we ship it. This ensures it communicates perfectly with your car’s engine computer and other systems right out of the box, just like a part from the dealership, but without the extra programming fee.
Do I need to take my car to a dealer after installation?
No. Because the module is pre-programmed to your VIN, no further dealership programming or expensive relearn procedures are required. This is a true plug-and-play solution designed to save you time and money.
My old module has a different part number on it. Will this still work?
Yes, most likely. GM uses many different service numbers for the same T42 module over the years. Our module, part number 24256960, is a compatible replacement for numerous other part numbers, including 24252114, 24234503, and others listed in the product details. As long as your vehicle is listed as compatible, this module will function correctly.
Is there a core charge for my old part?
No, there is absolutely no core charge. You are not required to send your old, faulty module back to us. You can keep it or dispose of it at your convenience.
What kind of warranty is included?
This Transmission Control Module is backed by our comprehensive one-year warranty, giving you confidence and peace of mind in your repair.