If the once-seamless gear changes in your 2006-2011 Cadillac DTS now feel harsh, delayed, or unpredictable, you’re not just losing performance—you’re losing the luxury ride quality you paid for. As a technician with over two decades of experience, I’ve seen countless GM vehicles, including the DTS, suffer from these exact issues. The culprit is almost always a failing Transmission Control Module (TCM). This isn’t just an annoyance; it’s a critical component failure that can lead to being stranded in limp mode or even cause long-term transmission damage. This VIN-programmed T42 TCM, part number 24255280, is the definitive, reliable solution to restore your Cadillac’s powertrain to its original, smooth-operating condition.
From the Diagnostic Bay: The Case of the Hesitant Cadillac
A customer brought in his ’08 Cadillac DTS, complaining of what he called “transmission hesitation.” It would slam into gear from a stop and sometimes refuse to shift past 3rd gear on the highway. He was worried about a full transmission rebuild, which would cost thousands. After connecting my scan tool, I saw the classic P0700 (Transmission Control System Malfunction) and several solenoid circuit codes. Instead of jumping to conclusions, we checked the wiring and found no issues. The problem was internal to the TCM. By installing a pre-programmed DTS Transmission Control Module, we had him back on the road in under an hour, with shifting as smooth as the day it left the factory. He saved a fortune and avoided an unnecessary, invasive repair.
Diagnosing Your Cadillac: Common TCM Failure Signs
A failing TCM will give you clear warning signs. If your vehicle is experiencing any of the following, it’s time to consider a replacement. In my shop, over 90% of these symptoms on a DTS point directly to the module.
- ✔ Erratic, hard, or delayed gear shifts that disrupt your drive.
- ✔ The vehicle is stuck in a single gear (often called “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ A noticeable decrease in fuel economy as the transmission operates inefficiently.
- ✔ The transmission seems to slip out of gear or fails to engage properly from Park to Drive or Reverse.
Simple Steps to Restore Your Cadillac’s Shifting
This repair is straightforward enough for a confident DIYer and a quick job for any professional mechanic. No special programming tools are required. For the 2006-2011 Cadillac DTS, the TCM is typically located in the right-hand front of the engine compartment.
- 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: Find the TCM in the engine bay. On the DTS, it’s usually mounted on the right-hand (passenger) side.
- Disconnect and Remove: Carefully unplug the electrical connectors. Note the tab locations to avoid breaking them. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place. Reconnect the electrical harnesses securely until they click.
- Reconnect and Verify: Reconnect the negative battery terminal. Start the vehicle and check for any warning lights. A short test drive will confirm that shifting is back to normal. We recommend clearing any stored codes with a basic OBD2 scanner after installation.
Why Choose a Pre-Programmed DTS Transmission Control Module?
The single biggest advantage of this module is the VIN programming service. When you order, we flash the unit with your vehicle’s specific VIN and the latest GM software updates. This means the module arrives ready for installation, perfectly matched to your car’s factory settings. You completely bypass the need for an expensive trip to the dealership for programming, saving you time, towing fees, and hundreds of dollars in labor. It’s the most efficient way to get your luxury sedan performing its best again.
Confirmed Fitment for Your General Motors Vehicle
While this listing is focused on the Cadillac DTS, this T42 TCM is compatible with a wide range of GM vehicles. Please verify your part number (24255280) or contact us with your VIN to ensure perfect compatibility. This module is a direct replacement for many popular cars, trucks, and SUVs.
- Cadillac: DTS (2006-2011)
- Chevrolet: Avalanche, Cobalt, Colorado, Express, HHR, Impala, Malibu, Monte Carlo, Silverado, Suburban, Tahoe
- GMC: Canyon, Envoy, Savana, Sierra, Yukon
- Buick: Allure, LaCrosse, Lucerne, Rendezvous
- Pontiac: G5, G6, Grand Prix, Pursuit
- Saturn: Aura, Ion, Vue
- And others including Hummer H3, Saab 9-7X.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. This module comes pre-programmed to your vehicle’s VIN. It is a true plug-and-play solution, saving you the time and expense of a dealership visit.
Is this a difficult part to install myself?
For most DIYers with basic tools, this is a very manageable job that typically takes less than 30 minutes. Its location in the engine compartment makes it easily accessible.
What is a core charge?
A core charge is a deposit you pay until you return your old part. We do not require a core charge for this module, so you can keep your old part without any hassle.
Will this fix a P0700 code?
A P0700 code is a general transmission fault request. While a faulty TCM is a very common cause for this code, you should always diagnose any accompanying codes. If you have solenoid circuit codes along with the P0700, this module is very likely the solution.
What warranty is included with this part?
This part is backed by our one-year warranty, ensuring it provides reliable service and giving you peace of mind with your purchase.