Is your 2006-2007 Chevrolet Monte Carlo suffering from harsh shifting, getting stuck in gear, or throwing transmission codes? As a technician with over two decades of experience, I’ve seen these symptoms countless times, and the culprit is often a failing Transmission Control Module (TCM). This replacement T42 TCM, corresponding to part number 24234503, is the definitive solution to restore the crisp, reliable performance your car was built for.
The TCM is the brain of your automatic transmission, controlling everything from shift points to torque converter lockup. When it fails, the symptoms can range from annoying to dangerous. This module is expertly pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits and programming fees. It’s a true plug-and-play fix designed for both professional mechanics and determined DIYers.
A Technician’s Notebook
I remember a 2007 Monte Carlo that came into the shop stuck in ‘limp mode’—it wouldn’t shift out of 3rd gear. The owner was frustrated, having already replaced a shift solenoid with no luck. A quick scan showed a P0700 (Transmission Control System Malfunction) and a P0753 (Shift Solenoid ‘A’ Electrical). Instead of just chasing solenoids, experience pointed me to the TCM. These T42 modules are known for internal circuit failures that cause false solenoid codes. We installed a VIN-programmed module, and in less than an hour, the car was shifting perfectly. The customer saved hundreds by avoiding a wild goose chase for a simple electronic fix.
Is Your Monte Carlo Exhibiting These Transmission Woes?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is likely the solution you need.
- ✔️ Harsh, slamming shifts or delayed gear engagement.
- ✔️ The vehicle is stuck in one gear (often called limp mode).
- ✔️ An illuminated Check Engine Light with codes like P0700, P0750, P0755, or other solenoid-related DTCs.
- ✔️ Failure to upshift or downshift, leading to poor acceleration.
- ✔️ A noticeable drop in fuel economy.
- ✔️ Complete loss of communication with the transmission module.
DIY-Friendly Installation in Under 30 Minutes
Replacing the 2006-2007 Monte Carlo TCM is a straightforward job that you can do in your own garage. No special tools are required.
- Safety First: Always disconnect the negative terminal from your car’s battery before starting any electrical work.
- Locate the Module: On the 2006-2007 Monte Carlo, the TCM is conveniently located under the lower air cleaner housing. You’ll need to remove the airbox to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Reinstall the air cleaner housing.
- Final Steps: Reconnect the battery. While the module is plug-and-play, it’s always a good practice to use a basic OBD2 scanner to clear any stored fault codes from the vehicle’s memory.
Verified Compatibility for Your GM Vehicle
This T42 TCM is a direct replacement for part number 24234503 and is interchangeable with many other service numbers. While this page focuses on the 2006-2007 Monte Carlo TCM, it also fits a wide range of other GM vehicles, including:
- Chevrolet: Impala (06-11), Cobalt (06-10), HHR (06-11), Tahoe (07-09), Silverado (07-13), Express Van (06-14)
- Pontiac: G6 (06-10), Grand Prix (06-08)
- Buick: LaCrosse (06-09), Lucerne (06-11)
- GMC: Sierra (07-13), Yukon (07-09), Savana Van (06-14)
- Saturn: Aura (07-09), Vue (07-10), Ion (06-07)
- And many more. Please verify fitment using our vehicle selector tool.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We pre-program the module to your vehicle’s VIN before shipping. It arrives ready for immediate installation, saving you time and money.
Is there a core charge for my old part?
Absolutely not. You can keep your old module or dispose of it at your convenience. There are no hidden fees or core returns required.
What tools are needed for installation on a Monte Carlo?
You’ll only need basic hand tools: a socket set to remove the air cleaner housing and unbolt the module, and a wrench to disconnect the battery terminal.
What if this doesn’t fix my problem?
While this module solves the most common transmission electronic issues, we stand by our products. This part comes with a one-year warranty, and our expert support team is here to assist with any diagnostic questions you may have.