If you’re dealing with the frustration of a 2005 Buick Allure that shifts harshly, hesitates, or throws a check engine light, you know how disruptive it can be. As a technician with over two decades of experience under the hood, I’ve seen countless drivers worry about costly, complex transmission repairs. The good news is that the solution is often simpler and more affordable than you think. This Transmission Control Module (TCM) is the reliable, straightforward fix you need, arriving at your door fully programmed and ready for installation.
The brain of your automatic transmission, the TCM, is responsible for executing smooth, precise gear changes. When it fails, you’ll experience a range of symptoms from annoying to dangerous, such as getting stuck in gear (limp mode) or unpredictable shifting. We take the guesswork and extra cost out of the repair. Simply provide your vehicle’s VIN during checkout, and our experts will program this module with the latest GM factory software specifically for your car. This eliminates the need for an expensive trip to the dealership for programming, saving you time and money.
From the Diagnostic Bay: A Common GM Story
A customer brought in a 2005 Pontiac Grand Prix—a vehicle that shares this exact TCM with the Allure—complaining of a hard 1-2 shift and an intermittent check engine light. He was worried he needed a full transmission rebuild. After connecting my scan tool, I pulled a P0756 code, pointing to a ‘Shift Solenoid B Performance/Stuck Off’ issue. While the code points to a solenoid, my experience told me to check the controller first. In these GM vehicles, heat and vibration often cause internal fractures in the TCM’s circuit board. We swapped in a VIN-programmed module, cleared the codes, and the car shifted like new. It’s a classic case where replacing the brain, not the muscle, was the correct and most cost-effective repair.
Is Your Vehicle Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re noticing any of the following, this module is the likely solution for your 2005 Allure TCM issues.
- âś” Harsh or erratic shifting between gears
- âś” Transmission getting stuck in one gear (limp mode)
- âś” Delayed engagement when shifting into Drive or Reverse
- âś” Check Engine Light illuminated with transmission-related Diagnostic Trouble Codes (DTCs) like P0700, P0751, P0756, or U0100 (Loss of Communication)
- âś” Poor fuel economy due to inefficient shifting
A Straightforward Guide to Installation
Installing your new TCM is a manageable job for a DIYer with basic tools. While locations vary slightly by model, the general process is consistent.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the TCM: On the 2005 Buick Allure, the TCM is typically found mounted to the lower air cleaner housing. Consult a repair manual for your specific vehicle if you’re unsure.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. Be gentle, as these plastic clips can become brittle over time.
- Remove the Old Module: Unbolt the mounting hardware holding the TCM in place and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed TCM in the same location, securing it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module and reconnect the negative battery terminal.
- Final Check: Start the vehicle and allow it to idle for a few minutes. Take it for a test drive to confirm that shifting has returned to normal.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of 2005 and select 2004 GM vehicles, ensuring seamless integration. It is fully compatible with part numbers: 24223112, 24226863, 24233595, 24234189, 24239427, YBWW, YDFC, YDFD, YDLT, YJHY, YKTB, and YKTF. Please confirm your vehicle is on the list below for guaranteed fitment.
COBALT 05 (behind LH strut tower)
CORVETTE 05 (LH frame rail)
ENVOY 05 (LH engine compartment, 8 cylinder)
ENVOY XL 05 (LH engine compartment, 8 cylinder)
ENVOY XUV 05 (LH engine compartment, 8 cylinder)
GRAND PRIX 05 (lower air cleaner housing)
GTO 05
ION 05 (behind LH strut tower)
LACROSSE 05 (3.6L, lower air cleaner housing)
PURSUIT 05 (LH strut tower)
RAINIER 05
RENDEZVOUS 04-05 (3.6L, air cleaner box)
TRAILBLAZER EXT 05 (LH engine compartment, 8 cylinder)
Frequently Asked Questions
Do I need to get this module programmed by a dealer?
No. This is the biggest benefit we offer. We program the module to your car’s specific VIN before shipping it, so it’s ready to install right out of the box.
What information do you need from me?
After you complete your purchase, you will need to provide us with your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we have this information to perform the programming.
Is this part a direct replacement for my original 2005 Allure TCM?
Yes, this is a direct-fit replacement for the original equipment on all the vehicles listed in the compatibility chart. It meets or exceeds original specifications.
Will this fix my transmission ‘limp mode’ problem?
In the vast majority of cases, a faulty TCM is the cause of the transmission entering ‘limp mode’ or ‘safe mode.’ Replacing it with this pre-programmed unit is the correct repair for that issue.
How do I find the part number on my old module?
The part number is typically printed on a sticker on the module’s case. However, as long as your vehicle is on our fitment list, this part will work, as it replaces multiple original part numbers.