Restore Your Monte Carlo’s 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 faulty Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen these T42 modules cause headaches for countless owners. The TCM is the electronic brain of your automatic transmission, responsible for every gear change and torque converter operation. When it fails, drivability and safety are compromised. This replacement module, part number 24238856, is the definitive solution, arriving pre-programmed to your vehicle’s specific VIN for a true plug-and-play repair.
The Smart Fix: Why VIN Programming is a Game-Changer
Traditionally, replacing a TCM meant a trip to the dealership for expensive programming. Our process eliminates that step entirely. We flash the module with the latest GM software updates tailored to your exact Monte Carlo before it even ships. This ensures that once installed, it communicates flawlessly with your vehicle’s engine computer and other systems, restoring the smooth, predictable shifting you expect. This isn’t just a replacement part; it’s a complete, ready-to-install solution for your 2006-2007 Monte Carlo TCM issues.
From the Diagnostic Bay: The Case of the Erratic Impala
A customer brought in an ’08 Impala—a car that shares its platform and TCM with the Monte Carlo—with a classic complaint: “It slams into gear sometimes, and other times it feels like it’s slipping.” The dash was lit up with a P0700 (Transmission Control System Malfunction) code. My initial checks on the fluid and wiring were fine. Experience pointed directly to the T42 TCM. These modules, often located in high-heat areas like under the air cleaner housing, are prone to internal electronic failure over time. We installed one of our VIN-programmed modules, and in less than 30 minutes, the car was shifting perfectly. No dealer visit, no complex relearn procedures—just a straightforward, effective repair that got the customer safely back on the road.
Is Your Monte Carlo Showing These Symptoms?
- ✔ Harsh, banging shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear only).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, or other solenoid-related faults.
- ✔ The transmission refuses to upshift or downshift correctly.
- ✔ A noticeable drop in fuel economy.
- ✔ Intermittent loss of communication with the TCM, causing unpredictable behavior.
A Straightforward Guide to Installation
For the DIY enthusiast or professional mechanic, installing this 2006-2007 Monte Carlo TCM is a simple job that typically takes less than half an hour. No specialized tools are required.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent electrical shorts and help reset the vehicle’s electronic systems.
- Locate the Module: On your Monte Carlo, the TCM is found under the lower air cleaner housing. You will need to remove the airbox assembly to gain access.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt the new, pre-programmed TCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Reassemble and Reconnect: Reinstall the air cleaner housing and reconnect the negative battery terminal.
- Final Check: Start the vehicle. The new module is ready to go, but it’s good practice to use a basic OBD2 scan tool to clear any stored fault codes from the initial failure.
Verified Vehicle Compatibility
This T42 Transmission Control Module is a direct replacement for part number 24238856 and is interchangeable with many other service numbers. While this page is focused on the Monte Carlo, it also fits a wide range of GM vehicles. Please verify your part number or consult the list below.
Fits 2006-2007 Chevrolet Monte Carlo (located under the lower air cleaner housing) and many other GM models including:
…Allure, Avalanche 1500, Canyon, Cobalt, Colorado, DTS, Envoy, Express Van, G5, G6, Grand Prix, HHR, Impala, LaCrosse, Lucerne, Malibu, Rainier, Savana Van, Sierra, Silverado, Tahoe, Trailblazer, Yukon, and more. Please confirm your specific model and location in the full fitment list.
Frequently Asked Questions
Do I need to take this part to a dealer for programming?
No. This is the biggest benefit of our service. We program the Transmission Control Module to your car’s VIN before shipping. It arrives ready for immediate installation, saving you time and money.
What information do you need to program the module?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) at checkout. This ensures we load the correct factory software for your specific car, including any transmission and gear ratio options.
Is this a difficult part to install myself?
For most individuals with basic mechanical skills, this is a very manageable DIY job. On the 2006-2007 Monte Carlo, it’s located under the air cleaner box and is accessible with common hand tools in under 30 minutes.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer. While this module often resolves the root cause (like an internal solenoid circuit fault), it’s crucial to ensure the transmission wiring and solenoids are in good condition. In the vast majority of cases I’ve diagnosed, a faulty TCM was the primary failure.
Is there a core charge for my old part?
No, we do not require you to send back your old module. There is no core charge, which simplifies the process for you.