Restore Crisp, Decisive Shifting to Your GM Truck
If you’re dealing with the frustration of erratic shifting, delayed gear engagement, or a persistent “Service Transmission” light in your 2019-2020 Sierra Denali 1500, you’re not alone. These modern 8-speed and 10-speed transmissions are incredibly sophisticated, and their performance is entirely dependent on the Transmission Control Module (TCM). When the TCM begins to fail, it can turn a smooth, powerful truck into a source of daily annoyance and concern. This isn’t just a comfort issue; it’s a matter of reliability and powertrain health.
This is your direct, effective solution: a genuine GM Transmission Control Module (Part Number 24289415), pre-programmed with the very latest GM software specifically for your truck’s Vehicle Identification Number (VIN). Forget about expensive dealership visits, programming fees, and vehicle downtime. We handle the complex programming for you, delivering a module that is ready for installation right out of the box. This ensures perfect communication between the engine and transmission, restoring the precise performance you expect from your Sierra.
Case Study: A Tricky Diagnosis
A few months back, a 2019 Silverado 1500 with the 5.3L and 8-speed came into my shop. The owner was complaining of intermittent, bone-jarring shifts from 1st to 2nd gear, but only when the truck was cold. There were no check engine lights, but my professional scan tool pulled a stored history code: U0101 – Lost Communication with TCM. On a test drive, I confirmed the harsh shift. The fluid was clean and full. After checking the wiring harness for any signs of damage near the module’s location on the LH core support, I suspected an internal TCM fault. We ordered a VIN-programmed module just like this one. The swap took less than 30 minutes, and the difference was immediate. The shifts were buttery smooth, hot or cold. This pre-programmed 2019-2020 Sierra Denali 1500 TCM saved my customer hundreds in dealer diagnostic and programming fees and got his truck back to him the same day.
Is Your Truck Exhibiting These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution.
- ✔ Harsh, slamming, or delayed gear shifts.
- ✔ The transmission seems to get stuck in one gear (limp mode).
- ✔ “Service Transmission” or “Check Engine” light is illuminated.
- ✔ Inaccurate gear indicator on the dashboard.
- ✔ Common Diagnostic Trouble Codes (DTCs) stored, such as P0700, P0601, or U0101 (Lost Communication With TCM).
A Straightforward Guide to Installation
Installing your new, pre-programmed TCM is a manageable job for a confident DIYer or any professional technician. Since we’ve handled the programming, no special scan tools are needed for the installation itself.
- Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- Locate the TCM: On most Sierra and Silverado models from this era, the TCM is mounted on the driver’s side (LH) core support, near the front of the engine bay.
- Disconnect Connectors: Carefully unclip the electrical wiring harnesses from the old module. Press the release tabs firmly and pull straight out. Avoid pulling on the wires themselves.
- Remove Mounting Bolts: Unbolt the old TCM from its mounting bracket. Keep the hardware, as you will reuse it.
- Install the New Module: Mount your new, pre-programmed 2019-2020 Sierra Denali 1500 TCM onto the bracket and tighten the bolts securely.
- Reconnect and Secure: Plug the electrical connectors into the new TCM. You should hear and feel a distinct click as they lock into place.
- Final Steps: Reconnect the negative battery terminal. A transmission relearn procedure may be recommended for optimal performance, which can often be initiated with a capable scan tool or will occur naturally over a short period of driving.
Verified Vehicle Compatibility
This module, part number 24289415, is the correct replacement for a wide range of GM vehicles and supersedes service numbers 24042698, 24043411, 24043413, and 24296206. Please provide your VIN upon purchase to ensure we load the correct software for your specific application.
- ✔ CAMARO 2022-2023
- ✔ SIERRA 1500 PICKUP 2019-2020
- ✔ SIERRA 2500 PICKUP 2020-2022
- ✔ SIERRA 3500 PICKUP 2020-2022
- ✔ SIERRA DENALI 1500 2019-2020
- ✔ SIERRA DENALI 2500 2020-2022
- ✔ SIERRA DENALI 3500 2020-2022
- ✔ SILVERADO 1500 PICKUP 2019-2020
- ✔ SILVERADO 2500 PICKUP 2020-2021
- ✔ SILVERADO 3500 PICKUP 2020-2021
Choosing this pre-programmed 2019-2020 Sierra Denali 1500 TCM is the smartest way to fix your transmission problems correctly the first time, saving you time, money, and the headache of a dealership appointment.
Frequently Asked Questions
Do I need to do any programming after I install this?
No. We program the module to your specific VIN before we ship it. It arrives ready to install, eliminating the need for expensive scan tools or a trip to the dealer for programming.
What information do you need from me?
After you complete your purchase, we will need the 17-digit Vehicle Identification Number (VIN) from your truck. This is typically found on your driver’s side dashboard (visible through the windshield) or on the driver’s door jamb sticker.
Is this a new part?
Yes, this is a genuine GM part with the latest software updates loaded directly from GM’s servers based on your VIN.
Will this fix my P0700 code?
A P0700 code is a general fault request from the TCM to the main computer to turn on the check engine light. While a faulty TCM is a very common cause, this code indicates that a more specific transmission-related code is stored. A failing TCM is often the root cause, making this part a highly probable fix.
What is the difference between part number 24043411 and 24289415?
Part number 24289415 is the current, updated service part number from GM that replaces the older 24043411 and other related numbers. It is the correct and most current part for the applications listed.