Restore Your Monte Carlo’s Smooth Shifting Performance
If your 2006-2007 Chevrolet Monte Carlo is suffering from erratic shifting, getting stuck in gear, or has an illuminated Check Engine Light, a failing Transmission Control Module (TCM) is the most likely culprit. As the electronic brain of your 4-speed automatic transmission (like the 4L60E or 4L65E), the TCM dictates every shift point and manages torque converter lockup. When it fails, drivability suffers, and what was once a smooth ride becomes a frustrating and unpredictable experience. I’ve seen it hundreds of times in my shop: a great car brought to its knees by a small electronic component.
This T42 series TCM is the definitive solution. It arrives at your door fully programmed to your vehicle’s specific VIN, ensuring it works perfectly right out of the box. You can skip the costly trip to the dealership for programming and get your car back to factory-spec performance quickly. This isn’t just a replacement part; it’s a permanent fix for common transmission communication errors and performance issues.
Case Study: The Phantom Shifting Problem
A customer brought in a 2007 Impala (which shares the same platform and TCM as the Monte Carlo) complaining of intermittent, violent 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). No solenoid codes were present, just a generic P0700 (Transmission Control System Malfunction). After checking the fluid and wiring harness, we suspected the TCM. The internal logic was failing under load, causing confused signals. We installed one of our VIN-programmed T42 modules, and in less than an hour, the car was shifting like it just rolled off the assembly line. This simple swap saved the customer from a potential transmission rebuild.
Diagnosing a Faulty 2006-2007 Monte Carlo TCM
A failing transmission module can mimic other mechanical issues, but there are specific symptoms to watch for. If you’re experiencing a combination of these problems, the TCM is the prime suspect. This module is designed to resolve these very issues by restoring proper communication between your engine and transmission.
Is Your Monte Carlo Showing These Telltale Signs?
- ✔ Jarring, harsh, or delayed gear shifts.
- ✔ The vehicle enters “limp mode,” refusing to shift out of a single gear.
- ✔ Check Engine Light is on with codes like P0700, P0750, or other solenoid-related DTCs.
- ✔ Inability to upshift or downshift, leading to poor acceleration.
- ✔ A noticeable drop in fuel economy.
- ✔ Intermittent loss of communication with the scan tool.
Your 30-Minute Monte Carlo TCM Installation Guide
For the 2006-2007 Monte Carlo, the TCM is conveniently located under the lower air cleaner housing, making it accessible for any DIY enthusiast. The entire process should take less than half an hour.
- 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: Remove the air cleaner assembly to gain clear access to the TCM mounted below it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old module. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place and securely reconnect the electrical harnesses. You should hear a click as they lock in.
- Final Steps: Reinstall the air cleaner assembly and reconnect the battery terminal. Start the vehicle to confirm the fix. We recommend using a basic OBD2 scanner to clear any stored fault codes.
Verified Fitment For These GM Vehicles
This T42 TCM, part number 24240400, is a direct-fit replacement for a wide range of General Motors vehicles equipped with 4-speed automatic transmissions. While this page is focused on the Monte Carlo, it is also compatible with the following models:
Chevrolet: Avalanche 1500 (07-08), Cobalt (06-10), Colorado (08-12), Express 1500/2500/3500 (06-14), HHR (06-11), Impala (06-11), Monte Carlo (06-07), Silverado 1500/2500 (07-13), SSR (05-06), Suburban 1500 (07-08), Tahoe (07-09), Trailblazer (06-09)
GMC: Canyon (08-12), Envoy / Envoy XL (06-09), Savana 1500/2500/3500 (06-14), Sierra 1500/2500 (07-13), Yukon / Yukon XL 1500 (07-09)
Buick: Allure (06-09), LaCrosse (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07)
Pontiac: G5 (07-10), G6 (06-10), Grand Prix (06-08), Pursuit (06), Montana (06-09)
Cadillac: DTS (06-11)
Saturn: Aura (07-09), Ion (06-07), Vue (07-10)
Hummer: H3 (08-10)
Saab: 9-7X (06-09)
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you. This module is programmed to your car’s VIN before shipping, making it a true plug-and-play solution.
Where is the TCM located on my 2006 Monte Carlo?
The Transmission Control Module is located in the engine bay, underneath the lower air cleaner housing.
Will this fix a P0700 code?
Yes, a P0700 code indicates a general fault in the transmission control system. A failing TCM is a very common cause, and replacing it with this part will often resolve the code and the underlying issue.
Is there a core charge for my old part?
No, there is absolutely no core charge. You can keep your old part or dispose of it without the hassle of sending it back.
What if I have a different part number on my module?
This module is interchangeable with many other GM part numbers, including 24252114, 24234503, and 24239224, among others. As long as your vehicle is on the compatibility list, this module will work.