Restore Peak Transmission Performance in Your GM Truck
Is your 2019-2020 Sierra 1500 or Silverado exhibiting erratic shifting, delayed gear engagement, or throwing a check engine light? You’re not just dealing with an annoyance; you’re facing a failing Transmission Control Module (TCM), the electronic brain of your truck’s transmission. Driving with a faulty TCM can lead to poor fuel economy, premature transmission wear, and unpredictable performance. This genuine GM Transmission Control Module, part number 24289415, is the definitive solution to get your truck operating smoothly and reliably again.
As a seasoned technician with over two decades of experience, I’ve seen firsthand how a failing TCM can cripple an otherwise perfect truck. The symptoms often start small—a slight hesitation or a clunky shift—but can quickly escalate. The key benefit we offer is a completely hassle-free process. We flash this module with the latest official GM software, programmed specifically to your vehicle’s VIN before we ship it. This means no expensive trips to the dealership for programming, no special tools required—just a straightforward replacement to solve your transmission woes.
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 your truck needs. Check for these common indicators:
- ✔ Harsh or erratic shifting between gears
- ✔ Delayed engagement when shifting from Park to Drive or Reverse
- ✔ Vehicle stuck in one gear (limp mode)
- ✔ Check Engine Light is on with transmission-related codes
- ✔ Common Diagnostic Trouble Codes (DTCs) such as P0700, P0751, or U0100 (Loss of Communication with TCM)
- ✔ Reduced fuel efficiency
From the Diagnostic Bay: The Case of the Confused Silverado
A customer brought in a 2019 Silverado 1500 with a complaint of sudden, violent downshifts when coming to a stop. No check engine light was on, which made the initial diagnosis tricky. After a test drive, I could feel the transmission struggling to select the right gear. Hooking up my professional scan tool, I monitored the live data from the TCM. I saw the module commanding gear changes that didn’t match the vehicle’s speed or throttle input. It was essentially confused. This is a classic sign of internal TCM logic failure, something I’ve diagnosed on hundreds of these GM trucks. We installed a VIN-programmed TCM like this one, performed the transmission fluid level check, and the truck was shifting like new in under an hour. The customer was thrilled to avoid a costly dealership diagnostic fee and get a fast, reliable fix.
The Importance of a Correctly Programmed 2019-2020 Sierra 1500 TCM
Modern transmissions rely on precise data to function correctly. This 2019-2020 Sierra 1500 TCM is not just a part; it’s a component loaded with vehicle-specific software that governs shift points, torque converter lockup, and line pressure. Our pre-programming service ensures that the module you receive is a perfect match for your truck’s specific configuration, including engine type, axle ratio, and tire size. This eliminates compatibility issues and guarantees that your transmission operates exactly as the manufacturer intended, protecting your investment for the long haul.
A Straightforward Guide to Installation
Replacing the TCM on these trucks is a job that a confident DIYer or any professional mechanic can handle. The module is typically located on the left-hand (driver’s side) core support. Follow these general steps for a successful installation:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes to ensure all systems are powered down.
- Locate the TCM: On most Sierra and Silverado models, the TCM is mounted to the front driver’s side of the radiator core support, near the headlight assembly.
- Disconnect Connectors: Carefully release the locking tabs on the electrical 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. There are typically two or three bolts holding it in place.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and secure the bolts.
- Reconnect and Secure: Plug the electrical connectors firmly back into the new TCM until they click into place. Reconnect the negative battery terminal.
- Final Check: Start the vehicle and check for proper gear engagement and a smooth idle. In some cases, a transmission adaptive pressure reset may be required with a capable scan tool, but often the vehicle will relearn on its own over the next 50-100 miles of mixed driving.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 24042698, 24043411, 24043413, 24289415, and 24296206. It is guaranteed to fit the following vehicles:
- ✔ 2022-2023 CAMARO (Underhood, LH frame rail)
- ✔ 2019 SIERRA 1500 PICKUP (New Style, mirrors on door skin)
- ✔ 2020 SIERRA 1500 PICKUP
- ✔ 2020-2022 SIERRA 2500 & 3500 PICKUP
- ✔ 2019-2020 SIERRA DENALI 1500
- ✔ 2020-2022 SIERRA DENALI 2500 & 3500
- ✔ 2019 SILVERADO 1500 PICKUP (New Style, mirrors on door skin)
- ✔ 2020 SILVERADO 1500 PICKUP
- ✔ 2020-2021 SILVERADO 2500 & 3500 PICKUP
Frequently Asked Questions
Do I need to do any programming after I receive this TCM?
No. We handle all the programming before shipment. Simply provide your vehicle’s VIN during checkout, and we will flash the module with the latest GM software specific to your truck. It arrives ready for installation.
Is this a difficult part to install myself?
For someone with basic mechanical skills and tools, this is a very manageable job. The TCM is typically easy to access in the engine bay. Please see our installation guide above for the general steps.
What is the difference between this and a cheaper one I found online?
The key difference is our professional, VIN-specific programming service using official GM software. Many other listings sell blank modules that require expensive dealer programming. Our solution saves you that time, cost, and hassle, ensuring a correct and reliable fix from the start.
Will this fix my transmission’s ‘limp mode’ issue?
In the vast majority of cases, yes. Limp mode is a protective measure triggered by the vehicle’s computer when it detects a critical fault, often from a failing TCM. Replacing the faulty module with this correctly programmed unit should resolve the issue.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your order until we receive and validate your VIN for programming.