Is Your Cadillac Shifting Erratically? The TCM Might Be the Culprit.
If you’re driving a 2004-2005 Cadillac CTS or a 2004-2006 Cadillac SRX, you expect a smooth, luxurious ride. But when your transmission starts acting up—with harsh shifts, delayed engagement, or a sudden Check Engine light—that luxury experience quickly turns into a frustrating ordeal. The heart of your vehicle’s automatic transmission system is the Transmission Control Module (TCM), and when it fails, it can cause a cascade of perplexing issues. This listing is for a direct replacement TCM, part number 24229790 (fully compatible with 24226571, 24223376, and 24240284), that arrives at your door pre-programmed to your vehicle’s specific VIN. This eliminates the need for expensive dealership programming, getting you back on the road faster and more affordably.
From the Diagnostic Bay
We had a 2005 Cadillac SRX come into the shop with a complaint of a hard 1-2 shift and occasionally getting stuck in 3rd gear (limp mode). The customer had already replaced the transmission fluid and filter, but the problem persisted. The scanner pulled a P0752 code for ‘Shift Solenoid A Stuck On’. While the code points to a solenoid, experience with these platforms told us to look deeper. The solenoids tested fine, but monitoring the TCM data stream showed erratic command signals. We swapped in a known-good, VIN-programmed TCM, and the SRX immediately started shifting perfectly. The original module had an internal electronic failure that was sending incorrect signals, mimicking a mechanical fault. It’s a classic case where the root cause isn’t the most obvious one, and why a reliable 2004-2005 CTS TCM is critical for an accurate repair.
Common Symptoms of a Failing Cadillac TCM
A failing TCM can manifest in various ways, often being mistaken for a more severe internal transmission failure. Before you condemn your transmission, check if your vehicle is exhibiting any of these common symptoms. A faulty module is a frequent cause of these issues in CTS and SRX models.
- ✔ Harsh or Erratic Shifting: Experiencing sudden, jerky shifts between gears, both upshifting and downshifting.
- ✔ Delayed Transmission Engagement: A noticeable pause after shifting from Park into Drive or Reverse.
- ✔ Check Engine Light: The Malfunction Indicator Lamp (MIL) is illuminated with transmission-specific Diagnostic Trouble Codes (DTCs), such as P0700, P0751, P0756, etc.
- ✔ Getting Stuck in One Gear: The transmission may enter a “limp mode” or “fail-safe” mode, typically locking into 2nd or 3rd gear to prevent further damage.
- ✔ Poor Fuel Economy: Inefficient shifting and incorrect gear selection can lead to a sudden drop in your vehicle’s MPG.
- ✔ Warning Messages on Dash: You may see messages like “Service Transmission” or other related warnings on your driver information center.
- ✔ Inability to Shift into Higher Gears: The vehicle may struggle or refuse to shift into its top gears, causing high RPMs at cruising speeds.
The Plug-and-Play Solution: A Pre-Programmed 2004-2005 CTS TCM
The biggest hurdle when replacing a modern vehicle module is the programming. Traditionally, you would have to install the new part and then have your vehicle towed to a dealership for expensive, specialized programming. We eliminate that entire step. By providing us with your vehicle’s VIN (Vehicle Identification Number) at checkout, our technicians will flash this module with the latest, most up-to-date software directly from GM. This ensures that the TCM is perfectly matched to your vehicle’s specific configuration, including its engine, tire size, and other factory options. When you receive the part, it’s a simple bolt-in, plug-in installation. No extra trips, no hidden fees, just a straightforward repair.
Guaranteed Fitment
This module is a direct replacement for the following vehicles and part numbers. Please verify your vehicle’s model and year before ordering. The module is located in the right-hand (passenger side) front of the engine compartment.
- Cadillac CTS: 2004-2005
- Cadillac SRX: 2004-2005
- Cadillac SRX: 2006 (3.6L Engine)
- Cadillac SRX: 2006 (4.6L Engine, with ID 24229791)
This part is a direct replacement for original equipment part numbers: 24223376, 24226571, 24229790, and 24240284.
Frequently Asked Questions
Do I need to get this TCM programmed by a dealer?
No. This is the primary benefit of our service. We program the module to your vehicle’s VIN before it ships. When it arrives, it is ready for installation with no additional programming required.
How do I provide my VIN number?
You can add your 17-digit VIN in the notes section during checkout. If you forget, we will contact you via email after your purchase to request it. We cannot ship your order until we have your VIN.
Where is the TCM located on my 2005 Cadillac CTS?
For the 2004-2005 CTS and 2004-2006 SRX, the Transmission Control Module is located in the engine bay, on the right-hand (passenger) side, near the front.
Will this fix my hard shifting problem?
If the hard shifting is caused by a faulty TCM, then yes, this part is the correct solution. However, transmission issues can also be caused by mechanical failures, bad solenoids, or low fluid. We always recommend a proper diagnosis by a qualified mechanic to confirm the TCM is the point of failure before ordering.
Is this a new or used part?
This is a high-quality, inspected, and tested used OEM part. Each module is verified for full functionality and then loaded with fresh, vehicle-specific software to ensure reliable performance.
What is the warranty on this part?
This part comes with our standard warranty, ensuring it is free from defects. Please see our warranty page for full details and terms.