Restore Smooth, Confident Shifting to Your GM Truck
If you’re dealing with the frustration of a transmission that slams into gear, hesitates, or throws a check engine light, you understand how it can ruin your driving experience. As a technician with over two decades in the bay, I’ve seen firsthand how a faulty Transmission Control Module (TCM) can sideline an otherwise perfect truck. This isn’t just an inconvenience; it’s a problem that affects your vehicle’s performance and reliability. That’s why we offer this genuine GM Transmission Control Module, part number 24289415, as a direct-fit, hassle-free solution.
The biggest hurdle with replacing a modern TCM is the need for expensive dealership programming. We eliminate that step entirely. Before this module ships, our experts will program it with the latest GM-certified software, specifically matched to your truck’s Vehicle Identification Number (VIN). This ensures seamless communication between your engine and transmission, restoring the precise shifting logic your vehicle had from the factory. This isn’t just a part; it’s a complete, ready-to-install fix for your 2019-2020 Sierra Denali TCM issues.
Case Study: A Tricky Diagnosis
A customer brought in a 2019 Silverado 1500 with a complaint of intermittent, harsh 2-3 upshifts and occasional ‘Service Transmission’ warnings. No codes were stored, making it a diagnostic headache. We monitored live data and saw the TCM command and actual gear ratios were momentarily out of sync. Instead of a costly internal transmission repair, we started with the brain. We installed a new, VIN-programmed TCM. The software updates included in the programming addressed this exact condition. A simple module swap saved the customer thousands and restored perfect shifting. This highlights why having the latest software is just as important as the part itself.
Is Your Truck Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re noticing any of the following, this module is the likely solution:
- ✔ Harsh or delayed shifting between gears
- ✔ Vehicle stuck in one gear (limp mode)
- ✔ ‘Service Transmission’ or ‘Transmission Fault’ message on the dash
- ✔ Check Engine Light with transmission-related codes (e.g., P0700, P0751, U0100)
- ✔ Unexplained loss of power or poor fuel economy
A Straightforward Guide to Installation
Installing your new 2019-2020 Sierra Denali TCM is a job most DIYers can handle with basic tools. Since it arrives pre-programmed, no further electronic work is needed.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the TCM: On most compatible trucks, the TCM is mounted on the left-hand (driver’s side) core support, near the radiator.
- Disconnect Electrical Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Do not force them.
- Remove the Old Module: 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 TCM onto the bracket and secure it with the original hardware.
- Reconnect and Secure: Plug the electrical connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- Final Check: Start the vehicle and allow it to run for a few minutes. Check for any warning lights and take it for a test drive to confirm smooth shifting has been restored.
Verified Vehicle Compatibility
This module, part number 24289415, is a direct replacement for service numbers 24042698, 24043411, 24043413, and 24296206. It is guaranteed to fit the following vehicles:
SIERRA 1500 PICKUP 19 Transmission Control; new style (mirrors mount on door skin), (LH core support)
SIERRA 1500 PICKUP 20 Transmission Control; (LH core support)
SIERRA 2500 PICKUP 20-22 Transmission Control; (LH core support)
SIERRA 3500 PICKUP 20-22 Transmission Control; (LH core support)
SIERRA DENALI 1500 19-20 Transmission Control; (LH core support)
SIERRA DENALI 2500 20-22 Transmission Control; (LH core support)
SIERRA DENALI 3500 20-22 Transmission Control; (LH core support)
SILVERADO 1500 PICKUP 19 Transmission Control; new style (mirrors mount on door skin), (LH core support)
SILVERADO 1500 PICKUP 20 Transmission Control; (LH core support)
SILVERADO 2500 PICKUP 20-21 Transmission Control; (LH core support)
SILVERADO 3500 PICKUP 20-21 Transmission Control; (LH core support)
Frequently Asked Questions
Frequently Asked Questions
Do I need to do any programming after I receive this part?
No. This module is fully programmed to your vehicle’s VIN before it is shipped. It is a true plug-and-play solution, ready for installation right out of the box. No trip to the dealership is required.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) contains specific information about your truck’s options and build. We use it to load the exact GM software and calibrations your vehicle requires for optimal transmission performance and communication with other onboard systems.
Is this a new or used part?
We supply genuine GM service parts. This module is a new, reliable component ready to provide years of dependable service.
Will this fix my transmission codes like P0700?
In most cases, yes. A P0700 code is a general fault request from the TCM. If the TCM itself is the source of the failure, replacing it with this programmed unit will resolve the code and the underlying issue. It also commonly resolves communication codes like U0100.
What if my part number isn’t 24289415?
This module is a direct replacement for several service numbers, including 24042698, 24043411, 24043413, and 24296206. Please check your original part for one of these numbers or verify fitment using our compatibility list.