Restore Crisp, Reliable Shifting to Your GM Vehicle
If you’re dealing with the frustration of a transmission that bangs into gear, gets stuck in limp mode, or throws confusing error codes, you know how quickly it can ruin your driving experience. In my 20+ years in the shop, I’ve seen firsthand how a failing Transmission Control Module (TCM) can mimic a major mechanical failure, causing unnecessary stress and diagnostic headaches. This isn’t just an inconvenience; it’s a critical component for your vehicle’s performance and safety. This is the definitive solution for your 2005 Allure TCM and a wide range of other GM vehicles from that era.
What makes this part the right choice? We take the guesswork and extra expense out of the repair. Before this module ever ships, we program it with the latest GM software updates specifically matched to your vehicle’s VIN. This means no trip to the dealership for expensive flashing, no special tools required. It arrives at your door ready for a straightforward installation, restoring the precise electronic control your transmission was designed to have. You’re not just buying a part; you’re getting a plug-and-play fix that gets you back on the road with confidence.
From the Diagnostic Bay: The “Ghost” in the Transmission
I remember a 2005 Pontiac Grand Prix that came in with a classic complaint: “It just slams into second gear, and sometimes the check engine light comes on.” The owner was worried he needed a full transmission rebuild. I pulled the codes and found a U0101 (Lost Communication with TCM) and a P0700 (Transmission Control System Malfunction). Instead of starting a costly teardown, my experience pointed to the module itself. We ordered a VIN-programmed TCM like this one. The swap took less than 30 minutes. On the test drive, the shifts were buttery smooth, and the codes were gone for good. The customer saved thousands and drove away with a car that felt new again. This is a common story for these platforms, and a pre-programmed module is the most efficient fix.
Common Signs of a Failing Transmission Control Module
- ✔ Harsh, erratic, or delayed shifting
- ✔ Vehicle stuck in one gear (often called “limp mode”)
- ✔ Check Engine Light illuminated with transmission-related codes
- ✔ Common Diagnostic Trouble Codes (DTCs) like P0700, P0751, P0756, or U0101
- ✔ No communication with the TCM via a diagnostic scan tool
- ✔ Inaccurate or missing gear indicator (PRNDL) on the dash
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- ✔ Locate the TCM: On the 2005 Buick Allure, Pontiac Grand Prix, and similar models, the TCM is typically found mounted to the lower air cleaner housing. On other vehicles like the Envoy or Trailblazer, it’s often on the driver’s side (LH) of the engine compartment.
- ✔ Disconnect Connectors: Carefully unclip and remove the electrical wiring harnesses connected to the old module. Inspect them for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the old TCM from its mounting bracket. It’s usually held in place by a few small bolts or screws.
- ✔ Install the New Module: Mount your new, pre-programmed TCM in the exact same location and secure it with the original hardware.
- ✔ Reconnect Everything: Firmly plug the wiring harnesses back into the new module. Reconnect the negative battery terminal.
- ✔ Final Check: Start the vehicle and allow it to idle for a moment. Test drive to confirm that shifting has returned to normal.
Verified Vehicle Compatibility
This module is a direct-fit replacement for the following vehicles and configurations. It is also compatible with part numbers 24223112, 24226863, 24233595, 24234189, YBWW, YDFC, YDFD, YDLT, YJHY, YKTB, and YKTF.
COBALT 2005 Transmission; (LH strut tower)
CORVETTE 2005 Transmission; (LH frame rail)
ENVOY 2005 Transmission; (LH engine compartment), (8 cylinder)
ENVOY XL 2005 Transmission; (LH engine compartment), (8 cylinder)
ENVOY XUV 2005 Transmission; (LH engine compartment), (8 cylinder)
GTO 2005 Transmission
GRAND PRIX 2005 Transmission; (lower air cleaner housing)
ION 2005 Transmission; (behind LH strut tower)
LACROSSE 2005 Transmission; (3.6L), (lower air cleaner housing)
PURSUIT 2005 Transmission; (LH strut tower)
RAINIER 2005 Transmission
RENDEZVOUS 2004-2005 Transmission; (3.6L), (air cleaner box)
TRAILBLAZER EXT 2005 Transmission; (LH engine compartment), (8 cylinder)
Frequently Asked Questions
Do I need to program this 2005 Allure TCM?
Do I need to program this 2005 Allure TCM?
No. This is the biggest benefit of our service. We program the module to your vehicle’s specific VIN before shipping it. It arrives ready to install, with no dealer visit required.
How do I provide my VIN number?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We will provide clear instructions on how to do this. We cannot ship the part until we have programmed it.
What is a Transmission Control Module (TCM)?
The TCM is the electronic brain of your automatic transmission. It receives data from various sensors on the engine and vehicle to control shift points, line pressure, and torque converter lockup for optimal performance and fuel economy.
Will this fix my ‘limp mode’ issue?
In many cases, yes. When the TCM fails, the vehicle’s computer often puts the transmission into a ‘fail-safe’ or ‘limp’ mode (usually stuck in 2nd or 3rd gear) to prevent further damage. Replacing a faulty TCM is the correct fix for this condition.
Is this part compatible with other part numbers?
Yes. This module, part 24239427, is a direct replacement for several other GM part numbers, including 24223112, 24226863, 24233595, and 24234189, among others listed in the description.