If your 2006-2011 Cadillac DTS is suffering from erratic shifting, getting stuck in gear, or throwing transmission-related check engine lights, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As the electronic brain of your automatic transmission, the TCM is responsible for every shift command, torque converter clutch engagement, and fluid pressure adjustment. When it fails, drivability and reliability suffer immensely. This isn’t just an annoyance; it’s a critical component for the health of your entire drivetrain.
This T42 series TCM, corresponding to part number 24239224, is the definitive solution. It’s not just a replacement part; it’s a fully prepared, plug-and-play fix. We take care of the most crucial step for you: VIN programming. By flashing the module with your vehicle’s specific VIN and the latest GM software updates before it ships, we eliminate the need for an expensive trip to the dealership for programming. This means you or your mechanic can install it, and it will work correctly right out of the box, communicating seamlessly with your vehicle’s other computers.
A Technician’s Notebook
I remember a 2008 Cadillac DTS that rolled into my bay with a classic case of intermittent limp mode. The owner was frustrated because the issue would disappear after restarting the car, only to return unpredictably. The scanner showed a generic P0700 (Transmission Control System Malfunction) but no specific solenoid codes. After checking the wiring harness for damage, we focused on the TCM. These T42 modules, especially after years of heat cycles in the engine bay, can develop internal circuit faults that don’t always throw a hard code immediately. Replacing the original with a correctly VIN-programmed module solved the problem permanently. The customer avoided a costly diagnostic rabbit hole and a potential transmission replacement.
Is Your Cadillac Exhibiting These Transmission Problems?
A faulty 2006-2011 DTS Transmission Control Module can cause a wide range of issues. In my 20+ years of experience, these are the most common indicators I’ve seen. If your vehicle is showing any of these signs, a failing TCM is a highly probable cause.
- ✔ Harsh, clunky, or delayed gear shifts that make driving uncomfortable.
- ✔ The vehicle gets stuck in a single gear (often 2nd or 3rd), a condition known as “limp mode.”
- ✔ An illuminated Check Engine Light or Transmission Warning Light on your dashboard.
- ✔ Diagnostic Trouble Codes (DTCs) stored in the system, such as P0700, P0750, or other solenoid-related faults.
- ✔ Inability to upshift or downshift, leading to poor acceleration and terrible fuel economy.
- ✔ Complete loss of communication with the TCM, preventing the vehicle from starting or shifting out of Park.
A Straightforward Fix: Installing Your New TCM
One of the best features of this part is its simple installation, which a confident DIYer can complete in under 30 minutes. For your 2006-2011 DTS Transmission Control Module, the unit is typically located in the right-hand (passenger side) front engine compartment. Follow these steps for a successful replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and to help reset the vehicle’s electronic systems.
- Locate the Module: On the Cadillac DTS, you’ll find the TCM mounted in the engine bay, often near the front right side. It’s a silver box with electrical connectors.
- Disconnect and Remove: Carefully unclip the electrical wiring harnesses. Then, unbolt the module from its mounting bracket. Keep the hardware safe for reinstallation.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Securely reconnect the wiring harnesses, ensuring they click into place to form a solid connection.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and allow it to idle for a few moments. Use a basic OBD2 scan tool to clear any lingering fault codes from the previous module’s failure.
Verified Fitment for Your General Motors Vehicle
While this is the correct part for your Cadillac, this versatile T42 TCM is also compatible with a wide range of other GM vehicles that use the 4L60E, 4L65E, 4L70E, and 4L80E 4-speed automatic transmissions. Please verify your part number (24239224) or check the list below. It is interchangeable with service numbers including 24242391, 24234503, 24252114, and more.
- Cadillac: DTS (2006-2011) – RH front engine compartment
- Chevrolet: Tahoe, Silverado, Express, Impala, Monte Carlo, HHR, Cobalt, Avalanche, Colorado
- GMC: Yukon, Sierra, Savana, Envoy, Canyon
- Buick: LaCrosse, Lucerne, Allure, Rainier, Rendezvous
- Pontiac: G5, G6, Grand Prix, Pursuit
- Saturn: Vue, Aura, Ion
- Hummer: H3
- Saab: 9-7X
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This module comes pre-programmed to your vehicle’s specific VIN. This makes it a true plug-and-play solution, saving you the time and expense of a dealership visit.
What is the main benefit of replacing a faulty TCM?
Replacing a failing TCM restores your transmission’s original smooth shifting performance, improves fuel efficiency, and eliminates warning lights and error codes. It’s essential for the long-term health of your transmission.
Is a core charge required for my old part?
No, there is no core charge. You can keep your old part, so you don’t have to worry about the hassle and expense of shipping it back.
Will this fix my car being stuck in ‘limp mode’?
Yes, in most cases. ‘Limp mode’ is a protective measure triggered by the vehicle’s computer when it detects a critical fault, often from the TCM. Installing a new, functioning module resolves the underlying fault and restores normal operation.
What does this part being interchangeable with other numbers mean?
General Motors often updates part numbers over the years. This module, 24239224, is a direct replacement for several older part numbers (like 24234503, 24252114, etc.), ensuring broad compatibility and that you’re getting a part with the latest functional revisions.