Restore Smooth Shifting to Your Chevrolet Impala
If your 2006-2011 Chevrolet Impala 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 a technician with over two decades of experience, I’ve seen countless GM vehicles, especially the Impala, come into the shop with these exact issues. The problem often isn’t the transmission itself, but this critical electronic component. This T42 series TCM, part number 24255280, is the definitive solution, pre-programmed to your vehicle’s specific VIN to ensure a seamless, plug-and-play repair that gets you back on the road without a costly trip to the dealership.
Case Study: A Tricky Diagnosis
A customer brought in their 2009 Impala, convinced they needed a full transmission rebuild. The car would slam into gear and occasionally refuse to shift past 2nd. Another shop quoted them over $2,500. After pulling the codes, I saw a P0752 (Shift Solenoid ‘A’ Stuck On) and a generic P0700. While this can point to an internal issue, experience with these T42 modules told me to check the controller first. Heat and vibration often cause internal solder joints to fail, leading to intermittent solenoid commands. We installed one of our VIN-programmed TCMs, and the problem was solved instantly. The customer saved thousands and avoided an unnecessary, major repair.
Is Your Impala Exhibiting These Transmission Faults?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs replacement:
- ✔ Harsh, slamming, or delayed gear shifts.
- ✔ 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, P0751, P0752, or other solenoid-related faults.
- ✔ The transmission refuses to upshift or downshift correctly.
- ✔ A noticeable decrease in fuel economy.
- ✔ Complete loss of communication with the TCM.
A Straightforward Guide to Installation
Replacing the 2006-2011 Impala TCM is a job most DIYers can handle in their own driveway in under 30 minutes. For the Impala, the module is conveniently located under the lower air cleaner housing.
- 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 access the TCM mounted below it.
- Disconnect and Remove: Carefully unclip the electrical connectors. Be gentle to avoid damaging the pins or clips. Then, unbolt the old 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. Start the vehicle and use a basic scan tool to clear any stored fault codes. No further programming is required.
Will This Fit My Vehicle?
This module is a direct-fit replacement for the 2006-2011 Impala TCM and is also compatible with a wide range of other GM vehicles. It interchanges with part numbers 24252114, 24234503, 24256960, and more. While this list is extensive, always confirm your part number or contact us with your VIN to guarantee fitment.
- Chevrolet Impala (2006-2011) – Located under the lower air cleaner housing
- Chevrolet Monte Carlo (2006-2007)
- Chevrolet HHR / Cobalt (2006-2011)
- Buick LaCrosse / Allure (2006-2009)
- Pontiac G6 / Grand Prix (2006-2010)
- And many more GM cars, trucks, and SUVs.
Frequently Asked Questions
Do I need to take my car to the dealer for programming after installation?
No. This is the biggest benefit of our service. We program the module to your car’s VIN before shipping. It arrives ready for immediate plug-and-play installation, saving you time and money.
What is a T42 TCM?
The T42 is the hardware designation for a generation of Transmission Control Modules used by General Motors primarily with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E.
Is there a core charge for my old part?
No, we do not require a core return. You can keep or dispose of your old module without any hassle or extra charges.
Will this fix a P0700 trouble code?
A P0700 code is a general fault request from the TCM to the main engine computer (ECM) to turn on the check engine light. While this module often resolves the underlying issue causing the P0700, you should always scan for other transmission-specific codes (like P07xx) to confirm the diagnosis.
What if I order the wrong part?
We strongly encourage you to provide your VIN at checkout to guarantee compatibility. If you have any doubts, our expert support team is here to help you verify the correct part for your Impala before you order.