Restore Your Cadillac’s Signature Smoothness
If your 2006-2011 Cadillac DTS is suffering from harsh shifts, delayed gear engagement, or has a check engine light on with transmission codes, you’re likely dealing with a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM vehicles, including the luxurious DTS, get sidelined by these exact issues. A faulty TCM doesn’t just make for a frustrating drive; it can cause premature wear on your transmission’s mechanical components. This isn’t a problem you want to ignore.
This T42 Transmission Control Module is the definitive solution. It arrives expertly programmed to your vehicle’s specific VIN, eliminating the need for an expensive and time-consuming trip to the dealership for programming. It’s designed to be a direct-fit replacement for part number 24243921, restoring the precise, responsive shifting and reliable performance you expect from your Cadillac.
Case Study: The Ghost in the Transmission
A customer brought in an ’08 Cadillac DTS with a complaint that stumped two other shops. The car would occasionally refuse to shift out of 2nd gear, but only after it was fully warmed up. There were no consistent codes, just a generic P0700 (Transmission Control System Malfunction) that would pop up intermittently. We checked the fluid, solenoids, and wiring—all perfect. From experience, I know these T42 modules can fail internally due to heat cycles, causing intermittent electrical faults. We installed a VIN-programmed module, and the problem vanished instantly. The customer was thrilled to have his smooth, predictable luxury car back without a costly transmission rebuild.
Is Your Cadillac DTS Showing These Signs?
A failing TCM will give you clear warnings. Don’t wait for a complete transmission failure. Look out for these common symptoms:
- ✔ Harsh, banging, or erratic gear shifts.
- ✔ The vehicle feels stuck in one gear (often called “limp mode”).
- ✔ Check Engine Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Poor acceleration and a noticeable drop in fuel economy.
- ✔ Complete loss of communication with the module, preventing shifting.
Your Step-by-Step Installation Guide
Replacing the 2006-2011 DTS Transmission Module is a straightforward job that most DIYers can handle in under 30 minutes with basic tools. Because this module is pre-programmed, it’s a true plug-and-play repair.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On the 2006-2011 Cadillac DTS, the TCM is located in the engine bay, on the right-hand (passenger side) front area.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly. Then, unbolt the module from its mounting bracket.
- Install the New Module: Mount the new, programmed module in place and tighten the bolts. Reconnect the electrical connectors, ensuring they click securely into place.
- Final Steps: Reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a scan tool, it’s good practice to clear any stored fault codes. Test drive the vehicle to confirm smooth shifting.
Verified Vehicle Compatibility
This module is a guaranteed fit for the following vehicles, acting as a direct replacement for part number 24243921 and other interchangeable numbers.
- Cadillac DTS: 2006, 2007, 2008, 2009, 2010, 2011 (Transmission; RH front engine compartment)
- This module also fits a wide range of other GM vehicles including the Chevrolet Impala, GMC Sierra, Buick Lucerne, and more. Please verify the part number for your specific application.
What does ‘VIN Programmed’ mean for my DTS?
What does ‘VIN Programmed’ mean for my DTS?
It means we load your car’s unique Vehicle Identification Number (VIN) and the latest GM software onto the module before we ship it. This ensures it communicates perfectly with your vehicle’s engine computer and other systems right out of the box, with no dealer programming required.
Is this a difficult part to install myself?
Not at all. For the Cadillac DTS, it’s one of the easier electronic repairs. It’s located in an accessible spot in the engine bay and requires only basic hand tools. Our step-by-step guide makes the process simple for any DIY enthusiast.
Will this fix a P0700 check engine light code?
Yes, in many cases. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the failure, replacing it with this pre-programmed 2006-2011 DTS Transmission Module will resolve the root cause and allow the code to be cleared.
Do I need to send my old part back?
No, there is no core charge or need to return your old module. You can dispose of it or keep it, making the repair process faster and more convenient for you.