2005 Envoy TCM YBWW Programmed Transmission Control Module

Restore Flawless Shifting to Your 2005 GM Vehicle

Are you battling frustrating transmission issues in your 2005 GMC Envoy? Unpredictable shifting, getting stuck in gear, or a persistent check engine light can turn any drive into a stressful ordeal. 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 component; it’s the brain of your automatic transmission, and when it falters, the symptoms are impossible to ignore. That’s why we offer a dependable, straightforward solution: a replacement TCM, programmed specifically for your vehicle.

This module is a direct-fit replacement, but with a crucial benefit that saves you time, money, and a trip to the dealership. Before we ship it, we flash the unit with the very latest GM-approved software, using the VIN you provide at checkout. This ensures it communicates perfectly with your vehicle’s powertrain right out of the box. You’re not just buying a part; you’re getting a complete, ready-to-install solution that restores the precise, smooth shifting performance you expect. For anyone looking for a reliable fix for their 2005 Envoy TCM, this is the most efficient path back to a healthy transmission.

Is Your Vehicle Showing These Symptoms?

A failing TCM can manifest in several ways. If you’re experiencing any of the following, your TCM is the likely culprit:

• ✔ Harsh, erratic, or delayed shifting between gears.
• ✔ The vehicle feels stuck in one gear (often called “limp mode”).
• ✔ Your instrument cluster displays a “Service Engine Soon” or transmission-related warning light.
• ✔ Diagnostic trouble codes (DTCs) such as U0101, P0700, or other transmission-specific codes are present.
• ✔ Poor fuel economy directly related to inefficient shifting.
• ✔ Inability to shift into or out of a specific gear.

A Straightforward Guide to Installation

Installing your new 2005 Envoy TCM is a manageable job for a DIYer with basic tools. While locations vary slightly by model (as noted in the fitment list), the general process is consistent.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
2. Locate the Module: On the 2005 Envoy with the 8-cylinder engine, the TCM is typically found in the engine compartment on the driver’s side (LH). For other models, refer to the fitment list for its specific location (e.g., under the air cleaner housing).
3. Disconnect Electrical Connectors: Carefully unclip the wiring harness connectors from the old TCM. Inspect the connectors for any corrosion or damage and clean them if necessary.
4. Remove the Old Module: Unbolt the old TCM from its mounting bracket. There are typically a few small bolts or nuts holding it in place.
5. Install the New Module: Mount your new, pre-programmed TCM onto the bracket and secure it with the original hardware.
6. Reconnect Everything: Firmly plug the wiring harness connectors into the new module. Reconnect the negative battery terminal.
7. Final Check: Start the vehicle and allow it to idle for a moment. Test drive the vehicle to confirm that shifting has returned to normal. In some cases, a transmission relearn procedure may be beneficial, but often not required.

Verified Vehicle Compatibility

This module is a guaranteed fit for the following vehicles and configurations. Please verify your model and specific options match the list below. This part is a direct replacement for part numbers: 24223112, 24226863, 24233595, 24234189, 24239427, YBWW, YDFC, YDFD, YDLT, YJHY, YKTB, and YKTF.

Frequently Asked Questions About Your 2005 Envoy TCM