Is Your Impala Shifting Erratically?
If you’re experiencing harsh shifting, delayed gear engagement, or your 2006-2011 Chevrolet Impala is stuck in limp mode, a failing Transmission Control Module (TCM) is the most likely culprit. The TCM is the brain of your automatic transmission, responsible for orchestrating every gear change. When it fails, it can mimic the symptoms of a catastrophic transmission failure, leading to costly misdiagnoses. This replacement T42 TCM, part number 24238856, is the definitive solution to restore your vehicle’s performance and drivability.
From the Diagnostic Bay
We recently had a 2009 Impala towed in. The owner was frustrated, having already spent hundreds on a transmission fluid service and new shift solenoids at another shop, with no improvement. The car would slam into gear and the check engine light was glaring. A quick scan revealed a generic transmission fault code, P0700. Instead of quoting a transmission rebuild, we diagnosed the root cause: a faulty internal processor on the original TCM. By installing this exact VIN-programmed T42 module, we had the car shifting like new in under an hour, saving the customer thousands of dollars and a major headache.
Symptoms of a Failing Impala TCM
- ✔ Unpredictable, harsh, or delayed gear changes that disrupt your drive.
- ✔ The vehicle is stuck in a single gear (limp mode), typically 2nd or 3rd, with limited power.
- ✔ Check Engine Light or other transmission-related warning lights are illuminated on your dashboard.
- ✔ Inconsistent upshifting or downshifting, making acceleration and deceleration feel jerky.
- ✔ A noticeable decrease in fuel economy as the transmission operates inefficiently.
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0750, or other solenoid-specific faults are stored.
The Ultimate Solution: A Programmed 2006-2011 Impala Transmission Module
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership. This T42 TCM is the superior choice for a lasting repair. We pre-program the module to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that the unit communicates flawlessly with your Impala’s Engine Control Module (ECM) and other onboard systems right out of the box. It arrives loaded with the latest GM software updates, resolving common factory bugs and optimizing transmission performance for longevity and efficiency. This is a true plug-and-play solution designed for both professional technicians and savvy DIYers.
Effortless Installation
For the 2006-2011 Chevrolet Impala, the TCM is conveniently located under the lower air cleaner housing, making it accessible for replacement. The entire process can typically be completed in under 30 minutes with basic hand tools. Simply disconnect the battery, remove the air cleaner assembly to access the old module, unplug the electrical connectors, swap the unit, and reconnect everything. Once installed, clear any remaining DTCs with a standard scan tool to complete the job. No core charge means you can keep your old part without any hassle.
Broad Compatibility
While this is the perfect fit for your Impala, this T42 TCM is also compatible with a wide range of other General Motors vehicles equipped with 4-speed automatic transmissions like the 4L60E, 4L65E, and 4L70E. It is an interchangeable replacement for numerous part numbers, including 24252114, 24234503, 24230461, and more, making it a versatile and reliable component for many models from Chevrolet, GMC, Buick, Pontiac, and Cadillac.
Frequently Asked Questions
What is VIN programming and why is it important for my Impala?
VIN programming installs your car’s specific software and calibration files onto the TCM. This ensures the module communicates correctly with your engine and other systems, controlling shift points, torque converter lockup, and line pressure precisely as the manufacturer intended. Without it, your vehicle may not start, shift properly, or may display error codes.
Do I need to take my car to a dealer after installing this TCM?
No. Because we pre-program the module to your VIN before shipping, no additional dealership visits or programming are required. It is a plug-and-play installation, saving you time and money.
Where is the TCM located on a 2006-2011 Chevrolet Impala?
On the 2006-2011 Impala, the Transmission Control Module is located underneath the lower air cleaner housing in the engine compartment. You will need to remove the air box to access it.
Is this a genuine GM-quality part?
This module is built to meet or exceed OEM specifications for performance and durability. It is a high-quality replacement part designed to provide a reliable, long-term solution for your transmission issues and is backed by our one-year warranty.
What happens if I install a TCM that isn’t programmed to my VIN?
An unprogrammed or incorrectly programmed TCM will cause communication errors with your vehicle’s network. This can result in a no-start condition, incorrect shifting, persistent check engine lights, and potentially damage other components. Our VIN programming service eliminates these risks.