Restore Crisp, Reliable Shifting in Your 2005 GM Vehicle
If you’re dealing with the frustration of a transmission that seems to have a mind of its own—harsh bangs into gear, delayed shifts, or a persistent check engine light—you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can sideline an otherwise perfectly good vehicle. This isn’t just a part; it’s the solution to get your vehicle driving like it should again. This module, part number 24233595, is the brain of your automatic transmission, and when it falters, the symptoms can be alarming.
The biggest challenge with replacing a TCM has always been the expensive and time-consuming trip to the dealership for programming. We eliminate that step completely. When you purchase this module, we use the Vehicle Identification Number (VIN) you provide to flash it with the very latest, most stable software directly from GM. This means it arrives at your doorstep ready for a true plug-and-play installation, solving common factory drivability issues and ensuring optimal performance. This is the most direct and reliable way to fix your transmission woes.
Is Your Vehicle Showing These Symptoms?
- ✔ Harsh or erratic shifting between gears.
- ✔ The transmission feels like it’s slipping or hesitating.
- ✔ Vehicle gets stuck in one gear (often called “limp mode”).
- ✔ Delayed engagement when shifting from Park to Drive or Reverse.
- ✔ Check Engine Light is on with transmission-related codes (e.g., P0700, P0753, P0758, P1860, U0101).
- ✔ No communication with the transmission module when scanned.
A Technician’s Notebook: The Intermittent Shifting Mystery
A customer brought in a 2005 Trailblazer (which shares its platform with the Envoy) with a complaint that stumped a couple of other shops. The transmission would shift perfectly when cold, but after 20-30 minutes of driving in traffic, it would start slamming into gear and occasionally get stuck in 3rd. There were no hard codes, just a history code for lost communication with the TCM. Instead of throwing parts at it, we monitored the data stream while driving. Everything looked normal until the engine bay got nice and hot. That’s when we saw the TCM data drop out intermittently. The module, located in the hot engine compartment, was failing under thermal stress. We installed a VIN-programmed 2005 Envoy TCM, and the problem was solved instantly. Heat-soak failure is a classic symptom for these units, and a pre-programmed replacement is the definitive fix.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait a few minutes before beginning work.
- ✔ Locate the TCM: On the 2005 Envoy and similar models (like the Trailblazer), the TCM is typically found in the engine compartment on the driver’s side (LH), often near the firewall or inner fender. On other compatible models like the Cobalt or Ion, it may be behind the LH strut tower.
- ✔ Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Do not force them.
- ✔ Remove the Old Module: Unbolt the old TCM from its mounting bracket. There are usually two or three bolts holding it in place.
- ✔ Install the New Module: Mount your new, pre-programmed TCM in the same location and secure it with the original bolts.
- ✔ Reconnect and Finalize: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect your battery terminal. The vehicle is now ready to be started and driven—no programming required.
Guaranteed Vehicle Compatibility
This module is a direct replacement for multiple part numbers and is guaranteed to fit the following vehicles and configurations. Please verify your model and specific options before ordering.
Fits These 2004-2005 Models:
ALLURE (05), COBALT (05), CORVETTE (05), ENVOY (05, 8 cyl), ENVOY XL (05, 8 cyl), ENVOY XUV (05, 8 cyl), GTO (05), GRAND PRIX (05), ION (05), LACROSSE (05, 3.6L), PURSUIT (05), RAINIER (05), RENDEZVOUS (04-05, 3.6L), TRAILBLAZER EXT (05, 8 cyl)
Frequently Asked Questions
Do I need to get this 2005 Envoy TCM programmed by a dealer?
No. This is the biggest benefit we offer. We program the module to your vehicle’s specific VIN before we ship it. It arrives ready to install, saving you hundreds in dealer fees and towing costs.
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot ship the module until we receive this information to ensure it is correctly programmed for your vehicle.
Where is the TCM located on my 2005 Envoy?
On the 2005 GMC Envoy with the 8-cylinder engine, the Transmission Control Module is located in the engine compartment on the driver’s side (LH).
Will this fix my check engine light?
If your check engine light is on due to a faulty TCM (with codes like P0700, U0101, or solenoid circuit faults), this replacement module will resolve the issue and allow the codes to be cleared.
Is this part new or used?
This is a high-quality, inspected, and tested component that has been expertly prepared with fresh GM software specific to your vehicle. It is guaranteed to restore function correctly.