If your 2006-2011 Chevrolet Impala is suffering from harsh, erratic shifting, getting stuck in gear, or has the dreaded check engine light on with transmission codes, you’ve likely pinpointed the culprit: a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen how a faulty TCM can make a perfectly good transmission behave erratically, leading to stressful driving and fears of a massive repair bill. This T42 TCM, part number 24235340, is the definitive, reliable solution to restore your vehicle’s performance and peace of mind.
This isn’t just a replacement part; it’s a complete fix. We pre-program each module to your Impala’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that the module communicates flawlessly with your vehicle’s powertrain computer right out of the box. You get to skip the expensive and time-consuming trip to the dealership for programming—making this a smart, cost-effective repair for both DIY enthusiasts and professional shops.
A Technician’s Notebook
I remember a 2009 Impala that came into the shop with classic transmission failure symptoms: banging into gear and stuck in 3rd (limp mode). The owner was convinced he needed a full transmission rebuild, a multi-thousand-dollar job. After connecting my scan tool, I saw a handful of solenoid communication codes and the master P0700 trouble code. Instead of jumping to the worst-case scenario, I checked the TCM. Sure enough, after swapping in a pre-programmed module, the car shifted like it just rolled off the factory line. That 30-minute fix saved the customer thousands and reinforced a key lesson: always diagnose the brain before condemning the body.
Is Your Impala Showing These Telltale Signs?
A failing TCM often broadcasts its issues through clear symptoms. If you’re experiencing any of the following, a new 2006-2011 Impala TCM is the likely solution:
- ✔ Harsh, slamming shifts or delayed gear engagement.
- ✔ Vehicle is stuck in “limp mode” (usually 2nd or 3rd gear).
- ✔ Check Engine Light or Transmission Warning Light is on.
- ✔ Diagnostic Trouble Codes (DTCs) are present, such as P0700, P0750, P0753, P0758, or other solenoid-related faults.
- ✔ Inconsistent or no upshifting/downshifting.
- ✔ Poor fuel economy and a feeling of sluggish performance.
- ✔ Complete loss of communication with the transmission.
DIY-Friendly Installation in Under 30 Minutes
Replacing the TCM on your Impala is a straightforward job that doesn’t require specialized tools. For the 2006-2011 Impala, you’ll find the module located under the lower air cleaner housing. Just follow these simple steps for a successful installation.
- Safety First: Disconnect the negative terminal from your car battery to prevent any electrical shorts and to help reset the vehicle’s computer systems.
- Locate the Module: Access the area beneath the air cleaner box in the engine compartment to find the old TCM.
- Disconnect and Remove: Carefully unplug the electrical connectors from the module. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount your new, pre-programmed TCM in place and securely reconnect the electrical harnesses. Ensure they click into place.
- Final Steps: Reassemble the air cleaner housing and reconnect the battery terminal. Start the vehicle and use a basic OBD2 scan tool to clear any stored fault codes. Take it for a test drive to confirm smooth shifting.
Verified Compatibility for Your Vehicle
This T42 TCM is a guaranteed fit for your 2006-2011 Impala TCM replacement and is also compatible with a wide range of other GM vehicles. It is a direct replacement for part numbers 24252114, 24234503, 24235340, and more.
- Chevrolet: Impala (06-11), Monte Carlo (06-07), HHR (06-11), Cobalt (06-10), Malibu (06-10), Silverado, Tahoe, Express Van, and more.
- Buick: LaCrosse (06-09), Lucerne (06-11), Allure (06-09).
- Pontiac: G6 (06-10), Grand Prix (06-08), Pursuit (06).
- GMC: Sierra, Yukon, Savana Van, Canyon, Envoy.
- Saturn: Aura (07-09), Vue (07-10), Ion (06-07).
- Cadillac: DTS (06-11).
- Please see the full fitment list for detailed model and year options.
What does ‘VIN Programmed’ actually mean?
What does ‘VIN Programmed’ actually mean?
It means we load your vehicle’s unique 17-digit VIN into the module before shipping. This ensures the TCM has the correct software and calibration files for your Impala’s specific transmission and engine combination, allowing it to work perfectly right out of the box without any additional programming.
Do I need to take my car to a dealer after installing this?
No. Because the module is pre-programmed to your VIN, you completely avoid the need for a dealership visit for programming. This saves you time and the typical dealer service fee, which can be hundreds of dollars.
Is this part difficult to replace myself?
Not at all. For a 2006-2011 Impala, the TCM is located under the air cleaner housing. With basic hand tools, most DIY mechanics can complete the swap in under 30 minutes. It’s one of the easier electronic component replacements you can do.
Will this fix a P0700 trouble code?
In many cases, yes. The P0700 code is a general fault code indicating the TCM has detected a problem. Often, the problem is the TCM itself. If you also have solenoid or communication codes, a faulty TCM is the most likely cause, and this part is the correct fix.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old part without the hassle of needing to return it, simplifying the repair process for you.