If your 2006-2007 Chevrolet Monte Carlo is suffering from erratic shifting, getting stuck in gear, or has the check engine light on with transmission codes, you’ve likely pinpointed the problem: a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless GM vehicles sidelined by this exact issue. The TCM is the brain of your automatic transmission, and when it fails, it creates a cascade of frustrating and potentially damaging problems. This isn’t just an inconvenience; it’s a critical component for your car’s drivability and safety.
This replacement T42 TCM is the definitive solution. It comes fully pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive programming at a dealership. This means you get a part that is truly plug-and-play, designed to restore the precise, smooth shifting your Monte Carlo had when it was new. We handle the complex part so you can focus on a simple, effective repair.
Case Study: A Tricky Diagnosis
A customer brought in a 2007 Impala (which uses the same TCM as the Monte Carlo) with a classic complaint: intermittent ‘limp mode’ and harsh bangs when shifting from 1st to 2nd. They had already replaced two shift solenoids with no luck. After connecting my scan tool, I saw the generic P0700 code, but more importantly, I noticed intermittent communication loss with the TCM. Heat soak was causing internal fractures in the module’s circuit board—a very common failure point. Instead of chasing ghosts, we installed a VIN-programmed T42 TCM. The communication was restored, the codes cleared, and the car shifted perfectly on the test drive. This is why addressing the core problem is key.
Is Your Monte Carlo Exhibiting These Transmission Problems?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Harsh, delayed, or unpredictable gear shifts.
- ✔ The vehicle is stuck in a single gear (often called ‘limp mode’).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, or other solenoid-related faults.
- ✔ A sudden drop in fuel economy or a feeling of lost power.
- ✔ Complete loss of communication with the transmission module.
A Straightforward Guide to Installation
One of the best features of this part is its simple installation, which most DIYers can complete in under 30 minutes with basic hand tools. For the 2006-2007 Monte Carlo, the TCM is typically found under the lower air cleaner housing.
- Safety First: Disconnect the negative terminal from your car’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: Find the TCM, which is situated beneath the air cleaner box in your engine bay. You will need to remove the air cleaner assembly 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 TCM: Mount your new, VIN-programmed TCM in the same location and securely re-attach the electrical connectors. You’ll hear a click when they are properly seated.
- Final Steps: Reinstall the air cleaner assembly and reconnect the battery terminal. Start the vehicle to confirm the fix. While the module is plug-and-play, using a basic scan tool to clear any stored historical codes is always good practice.
Verified Fitment for Your General Motors Vehicle
This T42 TCM, part number 24235340, is a direct replacement for a wide range of GM vehicles. While this page focuses on the 2006-2007 Monte Carlo TCM, it is also compatible with the following models. Please verify the location note for your specific vehicle.
- Chevrolet Monte Carlo (2006-2007): Transmission; (lower air cleaner housing)
- Chevrolet Impala (2006-2011): Transmission; (lower air cleaner housing)
- Buick Allure / LaCrosse (2006-2009): Transmission; (lower air cleaner housing)
- Pontiac Grand Prix (2006-2008): Transmission; (lower air cleaner housing)
- Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Suburban (2007-2013): Transmission; (next to battery)
- And many more GM models. See full list for details.
Frequently Asked Questions
Do I need to get this TCM programmed by a dealer?
No. This is the biggest benefit of our service. We pre-program the module to your car’s VIN before shipping it. It arrives ready for a plug-and-play installation, saving you time and hundreds of dollars in dealership fees.
What is the location of the TCM on a 2007 Monte Carlo?
On the 2006-2007 Chevrolet Monte Carlo, the Transmission Control Module is located in the engine bay, underneath the lower air cleaner housing. You will need to remove the air filter box to access it.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem. Often, the root cause is the TCM itself failing. Replacing a faulty TCM with this pre-programmed unit will resolve the underlying issue that triggers the P0700 and other related transmission codes.
Is this part difficult to install for a DIYer?
Not at all. This is a great job for a DIY enthusiast. It requires only basic hand tools and can typically be completed in under half an hour. Just locate the old module, disconnect it, and plug the new one in.
What if I have a different part number on my old module?
Part number 24235340 is interchangeable with many other GM service numbers like 24252114, 24234503, and others. As long as your vehicle model and year are on our compatibility list, this module will work perfectly once programmed to your VIN.