If your 2006-2011 Chevrolet Impala is suffering from erratic shifting, getting stuck in gear, or has the check engine light on with transmission codes, you’ve likely pinpointed a failing Transmission Control Module (TCM). As a seasoned technician, I’ve seen countless Impalas exhibit these exact issues, often leading drivers to fear a costly transmission rebuild. The good news is that the fix is often much simpler and more affordable: replacing the TCM itself.
This T42 Transmission Control Module is a direct-fit, OEM-quality replacement for your vehicle. The most significant benefit? It arrives at your door pre-programmed to your Impala’s specific Vehicle Identification Number (VIN). This eliminates the need for expensive dealership programming or specialized scan tools, making it a true plug-and-play solution for both professional mechanics and DIY enthusiasts. Restore the crisp, predictable shifting your car had when it was new.
Case Study: A Tricky Diagnosis
A customer brought in a 2009 Impala with a persistent P0752 code (Shift Solenoid ‘A’ Stuck On) and a nasty, jarring shift from 1st to 2nd gear. They had already replaced the solenoid inside the transmission pan—a messy job—but the problem remained. After hooking up my diagnostic tool, I could see the command signals from the TCM were erratic. The module was failing internally and sending faulty commands, making a perfectly good solenoid appear faulty. We installed one of these VIN-programmed TCMs, and in less than 20 minutes, the car was shifting flawlessly. It’s a classic example of how a bad module can mimic internal transmission problems, and why starting with the ‘brain’ is often the smartest diagnostic step.
Is Your Impala Showing These Telltale Signs?
A failing TCM doesn’t always mean total transmission failure. Often, the signs are subtle at first and worsen over time. Here’s what to look for:
- ✔ Harsh, banging, or delayed gear shifts, especially when the engine is warm.
- ✔ Vehicle is stuck in “limp mode” (usually second or third gear) with limited power.
- ✔ The Check Engine Light or a specific transmission warning light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are stored, such as P0700 (Transmission Control System Malfunction), or solenoid-specific codes (P0750-P0774).
- ✔ Inconsistent or no response from the transmission when shifting from Park to Drive or Reverse.
- ✔ Noticeable decrease in fuel economy due to inefficient shifting and torque converter lock-up issues.
A Straightforward Guide to Your Impala TCM Installation
Replacing the 2006-2011 Impala TCM is a job most people can handle in their own driveway with basic tools. For these Impala models, the TCM is conveniently located right under the air cleaner housing, making access simple.
- Safety First: Always disconnect the negative terminal from your car’s battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: Open the hood and find the black plastic air cleaner box. You’ll need to unclip it and remove it to access the TCM mounted below it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Press the release tabs firmly to avoid breaking them. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Bolt the new, pre-programmed module into place and securely plug in the electrical connectors. You should hear a click as they lock in.
- Final Steps: Reinstall the air cleaner housing and reconnect the negative battery terminal. It’s a good practice to use a basic OBD2 scanner to clear any lingering fault codes from the system’s memory.
Verified Vehicle Compatibility
This module is engineered to be a direct replacement for part number 24235340 and is interchangeable with a wide range of other GM service numbers. While it is a guaranteed fit for the 2006-2011 Chevrolet Impala, it also fits many other GM vehicles. Please confirm your vehicle is on the list below.
- Chevrolet Impala: 2006, 2007, 2008, 2009, 2010, 2011 (Transmission; located under lower air cleaner housing)
- Chevrolet Monte Carlo: 2006-2007 (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)
- …and many other GM models as listed in the comprehensive fitment guide.
Is this TCM really plug-and-play?
Is this TCM really plug-and-play?
Yes. We program the module to your vehicle’s VIN before shipping. This ensures it communicates correctly with your car’s engine computer and other systems right out of the box, with no need for a trip to the dealership.
Where is the TCM located on my 2008 Impala?
On the 2006-2011 Impala, as well as similar models like the Monte Carlo and LaCrosse, the TCM is found in the engine bay, mounted directly underneath the main air filter box assembly.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem and has requested the check engine light be turned on. While this module often resolves the root cause that triggered the P0700, you should scan for other, more specific P-codes (like P07xx) to confirm the diagnosis.
Do I need to return my old TCM?
No. We do not require a core return. You can keep your old part, which saves you the time, cost, and hassle of shipping it back.
What kind of warranty is included?
This module is backed by our one-year warranty, covering any defects in materials or workmanship, giving you confidence and peace of mind in your repair.