Restore Your GM’s Shifting Performance
If you’re dealing with the frustration of a transmission that won’t shift correctly, slams into gear, or leaves you stranded, you’ve come to the right place. As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Transmission Control Module (TCM) can bring an otherwise solid vehicle to a halt. This isn’t just an inconvenience; it’s a critical failure that compromises drivability and safety. This is the definitive solution for your 2005 LaCrosse TCM and a wide range of other GM vehicles from that era.
What makes this part different? We take the guesswork and extra expense out of the equation. Before this module ships, we flash it with the latest official GM software, programming it specifically to your vehicle’s Vehicle Identification Number (VIN). This means no costly trips to the dealership for programming. It arrives at your door ready for a straightforward installation, restoring the crisp, predictable shifting you expect from your car.
Case Study: A Tricky Diagnosis
A few months back, a 2005 Pontiac Grand Prix (which uses this exact same TCM) came into my bay with a complaint of intermittent, harsh 1-2 shifts and occasionally getting stuck in 3rd gear (limp mode). The owner had already replaced the fluid and filter with no improvement. My scan tool pulled a U0101 (Lost Communication with TCM) and a P0752 (Shift Solenoid ‘A’ Stuck On). While the P-code pointed to a solenoid, the U-code was the real clue. Intermittent communication failures are a classic sign of internal TCM failure. Instead of chasing solenoids, we installed a VIN-programmed TCM. The shift quality was immediately restored, and all codes were cleared. This simple module replacement saved the customer hundreds in unnecessary transmission work.
Common Signs of a Failing TCM
If your vehicle’s computer can’t properly communicate with or control the transmission, you’ll notice significant performance issues. Here are the tell-tale signs that your TCM is the culprit:
- ✔ Erratic or harsh shifting between gears
- ✔ The transmission getting stuck in one gear (often referred to as ‘limp mode’)
- ✔ Delayed engagement when shifting from Park to Drive or Reverse
- ✔ The Check Engine Light is illuminated
- ✔ Diagnostic Trouble Codes (DTCs) such as P0700, P0751, P0756, or communication codes like U0101
- ✔ Complete failure to shift gears
A Straightforward Guide to Installation
Replacing the 2005 LaCrosse TCM is a job most DIYers can handle with basic tools. The key is our pre-programming service, which eliminates the need for specialized scan tools. For the LaCrosse, Allure, and Grand Prix, the module is conveniently located under the air cleaner housing.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to ensure all systems are powered down.
- Locate the Module: On most compatible models, you’ll need to remove the air cleaner assembly to access the TCM. It’s typically mounted to the vehicle’s frame or a bracket nearby.
- Disconnect Connectors: Carefully unclip the electrical wiring harnesses from the old TCM. Inspect the connectors for any corrosion or damage before proceeding.
- Remove the Old TCM: Unbolt the old module from its mounting bracket. Keep the mounting hardware as you will need it for the new part.
- Install the New TCM: Mount your new, pre-programmed TCM using the original hardware. Ensure it is securely fastened.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module. Reinstall the air cleaner assembly. Finally, reconnect the negative battery terminal.
- Final Check: Start the vehicle and allow it to idle for a few minutes. Test drive the vehicle to confirm that shifting is smooth and the check engine light is off.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a variety of 2004-2005 GM vehicles and is compatible with multiple part numbers, including 24223112, 24226863, 24233595, 24239427, and others. Please verify your model and options below:
- ✔ Allure 2005: (lower air cleaner housing)
- ✔ Cobalt 2005: (behind LH strut tower)
- ✔ Corvette 2005: (LH frame rail)
- ✔ Envoy 2005: (LH engine compartment), (8 cylinder)
- ✔ Envoy XL 2005: (LH engine compartment), (8 cylinder)
- ✔ Envoy XUV 2005: (LH engine compartment), (8 cylinder)
- ✔ Grand Prix 2005: (lower air cleaner housing)
- ✔ GTO 2005: Transmission
- ✔ Ion 2005: (behind LH strut tower)
- ✔ LaCrosse 2005: (3.6L), (lower air cleaner housing)
- ✔ Pursuit 2005: (LH strut tower)
- ✔ Rainier 2005: Transmission
- ✔ Rendezvous 2004-2005: (3.6L), (air cleaner box)
- ✔ Trailblazer EXT 2005: (LH engine compartment), (8 cylinder)
By ordering this pre-programmed 2005 LaCrosse TCM, you’re not just buying a part; you’re buying a complete, hassle-free solution to get your vehicle driving like new again.
Frequently Asked Questions
Do I need to do any programming myself?
No. This Transmission Control Module comes fully programmed to your vehicle’s VIN with the latest GM software updates. It is ready for installation right out of the box, with no need for a trip to the dealer.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot program and ship the module without it. Please double-check it for accuracy to ensure perfect compatibility.
Is this a new or used part?
This is a high-quality, tested replacement part guaranteed to meet or exceed original equipment performance. We ensure every module is flashed with stable, correct software for your vehicle.
What if my original part number is not 24234189?
This module is a direct replacement for several part numbers, including 24223112, 24226863, 24233595, 24239427, and others listed in the description. As long as your vehicle is on the compatibility list, this part will work.
Will this fix my check engine light?
If your check engine light is on due to a faulty TCM (with codes like P0700 or U0101), this replacement module will resolve the issue and allow the light to be cleared.