Restore Your Buick’s Smooth Ride
If your 2006-2009 Buick LaCrosse is suffering from jarring shifts, delayed gear engagement, or has you stuck in ‘limp mode,’ you’re likely dealing with a failing Transmission Control Module (TCM). As a technician with over two decades of experience, I’ve seen countless drivers frustrated by these exact issues. The TCM is the brain of your automatic transmission, and when it falters, it can make your reliable LaCrosse feel unpredictable and unsafe. This isn’t just an annoyance; it’s a critical failure that impacts performance, fuel economy, and your peace of mind on the road.
This OEM-quality T42 TCM, part number 24235753, is the definitive solution. We take the guesswork and high costs out of the repair by pre-programming the module to your vehicle’s specific VIN. This means no expensive trip to the dealership for coding. It arrives at your door ready for a straightforward, plug-and-play installation, allowing you to restore your transmission’s precise, factory-new operation yourself.
From the Diagnostic Bay: The Case of the Hesitant LaCrosse
A customer brought in a 2008 LaCrosse with a complaint that stumped two other shops. The car would intermittently refuse to shift out of 2nd gear and the check engine light would flash, only to behave perfectly the next day. They had already replaced two shift solenoids based on DTCs, but the problem persisted. After a quick data stream analysis, I saw erratic command signals from the TCM. The internal logic was failing under thermal stress—a classic sign of TCM failure. We installed a VIN-programmed module, and the problem was solved permanently. It’s a reminder that chasing individual codes can be a waste of money when the root cause is the controller itself.
Is Your Buick Showing These Symptoms?
- ✔ Harsh, slamming, or erratic gear shifts.
- ✔ The vehicle is stuck in a single gear (limp mode), often 2nd or 3rd.
- ✔ Check Engine Light or Transmission Warning Light is on with codes like P0700 (Transmission Control System Malfunction), P0750, or other solenoid-related faults.
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Poor acceleration and a noticeable drop in fuel efficiency.
- ✔ Complete failure to shift gears or loss of communication with the module.
A Straightforward Guide to Installation
For the 2006-2009 Buick LaCrosse, this is a job most DIYers can handle in their own driveway in under 30 minutes. The TCM is typically located under the lower air cleaner housing, making it easily accessible.
- 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: Find the TCM situated beneath the air cleaner box in the engine bay. You will need to remove the air cleaner assembly to access it.
- Disconnect and Remove: Carefully unplug the electrical connectors from the old TCM. Then, unbolt the module from its mounting bracket.
- Install the New TCM: Mount the new, pre-programmed module in place of the old one and securely fasten the bolts. Reconnect the electrical connectors, ensuring they click into place.
- Final Steps: Reinstall the air cleaner assembly and reconnect the battery terminal. While our programming resolves most issues, it’s good practice to use a basic scan tool to clear any stored historical fault codes.
Verified Fitment for Your General Motors Vehicle
This module is a direct replacement for part number 24235753 and is compatible with a wide range of GM vehicles equipped with 4-speed automatic transmissions (like the 4L60E & 4L65E). While this listing is for the 2006-2009 LaCrosse TCM, it also fits other models. Please verify your part number or contact us with your VIN to ensure perfect compatibility.
- Buick: LaCrosse (06-09), Allure (06-09), Lucerne (06-11), Rainier (06-07), Rendezvous (06-07)
- Chevrolet: Impala (06-11), Monte Carlo (06-07), Silverado, Tahoe, Suburban, Express Van, Cobalt, HHR, Colorado
- GMC: Sierra, Yukon, Savana Van, Envoy, Canyon
- Pontiac: G6 (06-10), Grand Prix (06-08), G5 (07-10)
- And many more from Cadillac, Saturn, Hummer, and Saab.
Frequently Asked Questions
Is this module truly plug-and-play?
Yes. We program it using your vehicle’s VIN before shipping. This ensures it communicates perfectly with your car’s other computers, like the ECM and BCM, with no additional programming required.
Will this fix my specific transmission problem?
This module is the solution for failures of the electronic controller itself. If you are experiencing the symptoms listed above (erratic shifting, limp mode, TCM-specific codes), there is a very high probability this will resolve your issues. It does not fix internal mechanical failures like a broken clutch pack or bad torque converter.
Where is the TCM located on my 2007 LaCrosse?
On the 2006-2009 Buick LaCrosse, the Transmission Control Module is located in the engine compartment, underneath the lower air cleaner housing. Access is straightforward after removing the air box.
Do I need to return my old part?
No. We do not require a core return, so you can keep your old part. This saves you the time and hassle of shipping a core back.
What kind of warranty is included?
This module is backed by our one-year warranty, giving you confidence in the quality and reliability of your repair.