Restore Your Impala’s Smooth Ride and Ditch the Shifting Problems
If you’re dealing with a 2006-2011 Chevrolet Impala that slams into gear, refuses to shift, or has its check engine light glaring at you, the problem is very often the Transmission Control Module (TCM). 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 symptoms. The T42 TCM is the electronic brain of your automatic transmission, and when it fails, it can make your daily drive frustrating and unreliable. This isn’t just an annoyance; it can be a serious safety issue when your car won’t accelerate properly in traffic.
This replacement T42 Transmission Control Module, part number 24240400, is the definitive solution. We take the biggest hassle out of the repair process: programming. Each module is professionally programmed to your vehicle’s specific VIN before it ships. This means you get a true plug-and-play part that requires no expensive trip to the dealership for coding. It arrives ready to install, loaded with the latest GM software updates to ensure optimal performance and longevity for your 4-speed automatic transmission (like the 4L60E or 4L65E).
From the Diagnostic Bay
I remember a 2009 Impala that came in with a complaint of intermittent harsh shifting and occasionally getting stuck in 3rd gear. The customer had already replaced two shift solenoids with no luck. The check engine light would come and go. After connecting my scan tool, I saw a generic P0700 (Transmission Control System Malfunction) code but nothing specific. Through live data monitoring, I noticed the command signals from the TCM were dropping out randomly. This is a classic sign of internal TCM failure caused by heat cycles and vibration over the years. We installed a VIN-programmed 2006-2011 Impala TCM, and the car’s shifting performance was immediately restored to factory-new feel. The customer was thrilled to have their reliable car back without a costly diagnostic goose chase.
Is Your Impala Showing These Telltale Signs?
A failing TCM will give you clear warnings. If you’re experiencing any of the following, it’s time to consider a replacement. Ignoring these can lead to more severe transmission damage down the road.
- âś” Abrupt, harsh, or jerky gear changes.
- âś” Delayed shifting when accelerating from a stop.
- âś” Vehicle is stuck in “limp mode” (usually second or third gear only).
- âś” The check engine light or transmission warning light is on with codes like P0700, P0750-series (solenoid faults), or other transmission-related DTCs.
- âś” Inability to upshift or downshift, leading to poor acceleration and bad fuel mileage.
- âś” Complete loss of communication with the TCM, preventing diagnostics.
Your Straightforward 30-Minute Installation Guide
One of the best parts about this repair is its simplicity, especially on the Impala. You don’t need a vehicle lift or specialized tools. For the 2006-2011 Impala, the TCM is conveniently located right in the engine bay.
- Safety First: Always disconnect the negative terminal from your car’s battery before starting any electronic repair.
- Locate the Module: On your Impala, the TCM is found attached to the lower air cleaner housing. You’ll need to remove the air cleaner box to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors. Press the release tabs firmly to avoid breaking them. 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 housing and reconnect the battery. While our programming handles the software, it’s good practice to use a basic OBD2 scanner to clear any stored fault codes from the ECU after the installation is complete.
Why Choose a Pre-Programmed 2006-2011 Impala TCM?
This module is more than just a part; it’s a complete repair solution. By controlling shift points, torque converter clutch engagement, and line pressure, it directly impacts your car’s drivability, fuel efficiency, and overall health. Choosing our VIN-programmed module ensures you receive a component that is perfectly matched to your vehicle’s factory specifications, eliminating the common software conflicts that can arise from generic, non-programmed units. With no core charge and a solid warranty, you can fix your car with confidence and get back on the road fast.
Verified Fitment For These GM Vehicles
While this is the ideal part for your Impala, this T42 TCM is also compatible with a wide range of other General Motors vehicles. Please confirm your specific model and year below.
FITS: IMPALA 06-11 Transmission; (lower air cleaner housing) … and many other models including Chevrolet Cobalt, HHR, Monte Carlo; Pontiac G6, Grand Prix; Buick Allure, LaCrosse, Lucerne; GMC and Cadillac models. Please see the full list for details.
Do I need to take this part to a dealer for programming?
Do I need to take this part to a dealer for programming?
No. This is the biggest benefit of our service. We program the module to the VIN you provide during checkout. It will arrive at your door ready for immediate installation with no further programming required.
Is this a difficult part for a DIY mechanic to install?
Not at all. For the 2006-2011 Impala, the TCM is located under the air cleaner box, making it one of the easier modules to access. The entire job typically takes less than 30 minutes with basic hand tools.
What is a core charge? Do I need to send my old part back?
There is no core charge for this module. A core charge is an extra deposit you pay until you return your old part. We don’t require this, so you can keep your old part or dispose of it without any hassle.
Will this fix a P0700 trouble code?
Yes, in many cases. The P0700 code is a general fault code indicating the TCM has detected a problem. If the TCM itself is the source of the failure, replacing it with our programmed unit will resolve the issue and allow the code to be cleared.
What part numbers does this interchange with?
This T42 TCM is a direct replacement for a variety of service numbers, including 24240400, 24252114, 24234503, 24230461, 24239224, and many others listed in the product details.