Programmed 2020-2022 Sierra Denali 2500 TCM 24289415

Restore Peak Performance to Your GM Truck’s Transmission

If you’re dealing with erratic shifting, a persistent check engine light, or your 2020-2022 Sierra Denali 2500 has gone into a frustrating limp mode, a failing Transmission Control Module (TCM) is the likely culprit. As the electronic brain of your transmission, its proper function is critical for performance, fuel economy, and drivability. This genuine GM TCM, part number 24289415, is the definitive solution to get your powerful truck operating as it should, without the excessive costs and scheduling hassles of a dealership visit.

What sets our service apart is the crucial programming we perform before shipping. Simply provide your vehicle’s VIN during checkout, and our technicians will flash this module with the latest GM-certified software specific to your truck. This ensures seamless integration with your vehicle’s other systems, restoring precise shift points and communication. This is a direct-fit, ready-to-install solution for the common issues plaguing these advanced transmissions.

Is Your Truck Exhibiting These Transmission Faults?

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

• ✔ Harsh, delayed, or erratic gear shifts
• ✔ Vehicle stuck in one gear (limp mode)
• ✔ “Service Transmission” or “Shift to Park” message on the dash
• ✔ Illuminated Check Engine Light
• ✔ Common Diagnostic Trouble Codes (DTCs) such as P0700, U0101, P060B, or solenoid-specific codes (P0751, P0756, etc.)
• ✔ Inaccurate gear indicator display

A Straightforward Guide to Installation

Replacing the TCM on these trucks is a job most DIY enthusiasts can handle with basic tools. The module is typically easy to access.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the systems to discharge.
2. Locate the TCM: On most compatible Sierra and Silverado models, the TCM is mounted to the LH (driver’s side) core support, near the radiator.
3. Disconnect Electrical Connectors: Carefully release the locking tabs on the electrical harnesses and pull them straight out from the module. Do not force them.
4. Remove the Old Module: Unbolt the old TCM from its mounting bracket. Keep the hardware as you will reuse it.
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 electrical connectors back into the new module until they click into place. Reconnect the negative battery terminal.
7. Final Check: Start the vehicle and allow it to idle. The check engine light may take a few drive cycles to clear on its own, or you can clear it with a standard OBD-II scanner.

Verified Vehicle Compatibility

This module is a direct replacement for part number 24289415 and is also compatible with service numbers 24042698, 24043411, 24043413, and 24296206. It is guaranteed to fit the following vehicles: