Fix Your Impala’s Shifting Problems for Good
If your 2006-2011 Chevrolet Impala is suffering from harsh shifting, delayed gear engagement, or is stuck in limp mode, a failing Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can cripple a perfectly good vehicle. This T42 TCM, corresponding to part number 24239926, is the definitive solution to restore your transmission’s performance and get you back on the road with confidence.
The TCM is the brain of your automatic transmission, controlling everything from shift timing to torque converter clutch application. When it fails, communication between the engine and transmission breaks down, leading to the frustrating and potentially damaging symptoms you’re experiencing. This replacement module is meticulously prepared to OEM specifications and comes pre-programmed to your vehicle’s specific VIN, eliminating the need for expensive dealership visits for programming.
Case Study: A Tricky Diagnosis
A customer brought in a 2009 Impala with an intermittent ‘bang’ when shifting from 2nd to 3rd gear and a persistent P0700 code. They had already replaced two shift solenoids with no success. After a quick data scan, I noticed the line pressure commands from the TCM were erratic under load. Instead of a mechanical issue, the module itself was sending bad signals. We installed one of these VIN-programmed T42 modules. The repair took less than 30 minutes, and a test drive confirmed every shift was smooth and precise. It’s a classic example of why addressing the electronic root cause is critical.
Is Your Impala Exhibiting These Transmission Faults?
A failing 2006-2011 Impala Transmission Module will make its presence known. Look out for these common indicators:
- ✔ Harsh, slamming, or erratic gear shifts.
- ✔ The vehicle is stuck in a single gear (often 2nd or 3rd, known as “limp mode”).
- ✔ Check Engine Light or Transmission Warning Light is illuminated.
- ✔ Diagnostic Trouble Codes (DTCs) are stored, such as P0700 (Transmission Control System Malfunction), P0750-P0758 (Solenoid Faults), or other transmission-related codes.
- ✔ Failure to upshift or downshift properly.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ The transmission feels like it’s slipping between gears.
A Straightforward Guide to Your Impala TCM Replacement
One of the best features of this part is its simple, DIY-friendly installation. For the 2006-2011 Impala, the process is very accessible.
- Safety First: 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 TCM: On your Impala, the TCM is conveniently located under the lower air cleaner housing in the engine bay. You will need to remove the airbox to access it.
- Disconnect and Remove: Carefully unclip the electrical connectors from the old module. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new VIN-programmed TCM into place and securely reconnect the electrical harnesses. You’ll hear a ‘click’ when they are properly seated.
- Final Steps: Reinstall the air cleaner housing and reconnect the battery terminal. While the module is plug-and-play, it’s always best practice to use a basic OBD2 scan tool to clear any stored fault codes after the repair.
Verified Vehicle Compatibility
While this is the correct 2006-2011 Impala Transmission Module, it also fits a wide range of other General Motors vehicles. Please verify your model and the location notes below. This part is a direct replacement for multiple service numbers, including 24252114, 24234503, and 24239926.
AVALANCHE 1500 07-08 Transmission; (next to battery)
AURA 07-09 Transmission; (LH frame rail front)
CANYON 08-12 Transmission; (RH rear engine compartment)
COBALT 06-10 Transmission; (LH strut tower)
COLORADO 08-12 Transmission; (RH rear engine compartment)
DTS 06-11 Transmission; (RH front engine compartment)
ENVOY 06-07 Transmission; (LH engine compartment), (8 cylinder)
ENVOY 08-09 Transmission; (LH engine compartment)
ENVOY XL 06 Transmission; (LH engine compartment), (8 cylinder)
EXPRESS 1500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 2500 VAN 06-14 Transmission; (RH engine compartment)
EXPRESS 3500 VAN 06-14 Transmission; (RH engine compartment)
G5 07-10 Transmission; (LH strut tower)
G6 06-10 Transmission; (LH strut tower)
GRAND PRIX 06-08 Transmission; (lower air cleaner housing)
HHR 06-11 Transmission; (LH engine compartment)
HUMMER H3 08-10 Transmission; (RH rear engine compartment)
IMPALA 06-11 Transmission; (lower air cleaner housing)
ION 06-07 Transmission; (behind LH strut tower)
LACROSSE 06-09 Transmission; (lower air cleaner housing)
LUCERNE 06-07 Transmission; (4.6L), (LH engine compartment)
LUCERNE 08-11 Transmission; (LH engine compartment)
MALIBU 06-10 Transmission; (LH frame rail)
MONTE CARLO 06-07 Transmission; (lower air cleaner housing)
MONTANA 06-09 Transmission; (LH strut tower)
PURSUIT 06 Transmission; (LH strut tower)
RAINIER 06-07 Transmission
RENDEZVOUS 06-07 Transmission; (air cleaner box)
SAAB 9-7X 06-09 Transmission; (LH engine compartment)
SAVANA 1500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 2500 VAN 06-14 Transmission; (RH engine compartment)
SAVANA 3500 VAN 06-14 Transmission; (RH engine compartment)
SIERRA 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SIERRA 1500 PICKUP 08 Transmission; (next to battery)
SIERRA 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
SIERRA 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SILVERADO 1500 PICKUP 07 Transmission; (new style, smooth door skin), (next to battery)
SILVERADO 1500 PICKUP 08 Transmission; (next to battery)
SILVERADO 1500 PICKUP 09-13 Transmission; (next to battery), w/o hybrid option
SILVERADO 2500 PICKUP 07 Transmission; new style (smooth door skin), 6.0L, (next to battery)
SSR 05-06 Transmission; (front LH frame)
SUBURBAN 1500 07-08 Transmission; (next to battery)
TAHOE 07 Transmission; (next to battery)
TAHOE 08-09 Transmission; (next to battery), w/o auxiliary oil cooler pump
TERRAZA 06-07 Transmission; (LH strut tower)
TRAILBLAZER 06-07 Transmission; (LH engine compartment), (8 cylinder)
TRAILBLAZER 08-09 Transmission; (LH engine compartment)
TRAILBLAZER EXT 06 Transmission; (LH engine compartment), (8 cylinder)
UPLANDER 06-09 Transmission; (LH strut tower)
VUE 07-08 Transmission; 2.4L, (LH front engine compartment)
VUE 09 Transmission; 2.4L, w/o hybrid; (LH front engine compartment)
VUE 09 Transmission; 2.4L, w/hybrid, LH side front engine compartment, (shift control)
VUE 10 Transmission
YUKON 07 Transmission; (next to battery)
YUKON 08 Transmission; (next to battery), w/o auxiliary oil cooler control
YUKON 09 Transmission; (next to battery), w/o auxiliary oil cooler pump
YUKON XL 1500 07-08 Transmission; (next to battery)
Frequently Asked Questions
Frequently Asked Questions
What exactly does a Transmission Control Module (TCM) do?
The TCM acts as the central computer for your automatic transmission. It receives data from various sensors on the engine and vehicle, and uses this information to control shift solenoids, regulate hydraulic pressure, and manage torque converter lockup for optimal performance and fuel economy.
Do I really need to provide my VIN?
Yes. Providing your Vehicle Identification Number (VIN) is essential. We use it to program the module with the latest GM software specific to your Impala’s factory configuration. This ensures the TCM works perfectly right out of the box, with no additional programming required.
Will this part 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 of a P0700, it’s important to have the specific transmission codes (e.g., P07xx) read to confirm the diagnosis. A faulty TCM is a very common cause.
Is this a difficult part for a DIY mechanic to install?
Not at all. For most of the listed vehicles, including the Impala, the TCM is located in the engine bay and is accessible with basic hand tools. The entire process typically takes less than an hour, making it a great DIY-friendly repair.
Is there a core charge for my old part?
No, there is no core charge. You can keep your old module or dispose of it at your convenience, saving you the hassle and expense of shipping it back.