Restore Your Monte Carlo’s Smooth Ride
If your 2006-2007 Chevrolet Monte Carlo is suffering from erratic shifting, delayed gear engagement, or has suddenly gone into a frustrating ‘limp mode,’ the culprit is very likely a failing Transmission Control Module (TCM). As an automotive diagnostics expert with over two decades in the garage, I’ve seen firsthand how a faulty TCM can mimic a catastrophic transmission failure, leading to unnecessary and expensive repair quotes. This module, part number 24234274, is the electronic brain of your automatic transmission, and when it fails, your car’s performance and safety are compromised.
This isn’t just a replacement part; it’s a direct, reliable solution. We pre-program each T42 TCM to your vehicle’s specific VIN, ensuring it communicates flawlessly with your car’s other systems right out of the box. This critical step eliminates the need for a costly trip to the dealership for programming, saving you time and money. By precisely managing shift points, torque converter lockup, and line pressure, this module will restore the crisp, predictable shifting you expect from your Monte Carlo.
Case Study: The Misdiagnosed Monte Carlo
A few months back, a customer brought in his 2006 Monte Carlo SS. He was told by another shop that his 4T65E-HD transmission was shot and needed a full rebuild—a multi-thousand dollar job. The car was shifting violently between first and second, and the check engine light was on. I pulled the codes and saw a P0700 (Transmission Control System Malfunction) and several solenoid-specific codes. Instead of pulling the pan, I checked the TCM first. After swapping in one of our VIN-programmed modules, every single issue disappeared. The car shifted like new. That customer saved over $2,500 because the real problem was this simple-to-replace electronic part, not the internal mechanics.
Key Signs Your TCM is Failing
- ✔ Check Engine Light or Transmission Warning Light is illuminated on your dash.
- ✔ Your scanner shows Diagnostic Trouble Codes (DTCs) like P0700, P0750, or other transmission solenoid errors.
- ✔ The transmission shifts harshly, slams into gear, or hesitates between shifts.
- ✔ Your vehicle is stuck in a single gear (often 2nd or 3rd), a condition known as “limp mode.”
- ✔ You notice a sudden and unexplained drop in fuel economy.
- ✔ The transmission refuses to upshift or downshift as it should.
A Straightforward Guide to Installation
Replacing the 2006-2007 Monte Carlo TCM is a job most DIYers can handle in their driveway in under 30 minutes. No specialized tools are needed.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts and to help reset the system.
- Locate the Module: On your 2006-2007 Monte Carlo, the TCM is conveniently located under the lower air cleaner housing. You will 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, VIN-programmed TCM into place and securely reconnect the electrical harnesses. You’ll hear a click when they are properly seated.
- Final Steps: Reinstall the air cleaner housing and reconnect the battery terminal. Start the vehicle and allow it to idle for a few minutes. If you have a basic scan tool, it’s good practice to clear any stored DTCs.
Verified Vehicle Compatibility
This T42 TCM is a direct replacement for a wide range of General Motors vehicles. While this page focuses on the Monte Carlo, please verify your model in the list below. This part is interchangeable with service numbers: 24252114, 24234503, 24230461, 24235340, 24235754, and more.
- ALLURE 06-09 Transmission; (lower air cleaner housing)
- AVALANCHE 1500 07-08 Transmission; (next to battery)
- CANYON 08-12 Transmission; (RH rear engine compartment)
- COBALT 06-10 Transmission; (LH strut tower)
- COLORADO 08-12 Transmission; (RH rear engine compartment)
- DTS 06-11 Transmission; (RH front engine compartment)
- ENVOY 06-09 Transmission; (LH engine compartment)
- EXPRESS VANS 06-14 Transmission; (RH engine compartment)
- G5 07-10 Transmission; (LH strut tower)
- G6 06-10 Transmission; (LH strut tower)
- GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
- HHR 06-11 Transmission; (LH engine compartment)
- HUMMER H3 08-10 Transmission; (RH rear engine compartment)
- IMPALA 06-11 Transmission; (lower air cleaner housing)
- ION 06-07 Transmission; (behind LH strut tower)
- LACROSSE 06-09 Transmission; (lower air cleaner housing)
- LUCERNE 06-11 Transmission; (LH engine compartment)
- MALIBU 06-10 Transmission; (LH frame rail)
- MONTANA 06-09 Transmission; (LH strut tower)
- MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
- PURSUIT 06 Transmission; (LH strut tower)
- SAAB 9-7X 06-09 Transmission; (LH engine compartment)
- SAVANA VANS 06-14 Transmission; (RH engine compartment)
- SIERRA PICKUPS 07-13 Transmission; (next to battery)
- SILVERADO PICKUPS 07-13 Transmission; (next to battery)
- TAHOE 07-09 Transmission; (next to battery)
- TRAILBLAZER 06-09 Transmission; (LH engine compartment)
- UPLANDER 06-09 Transmission; (LH strut tower)
- VUE 07-10 Transmission; (LH front engine compartment)
- YUKON 07-09 Transmission; (next to battery)