Restore Smooth, Decisive Shifting to Your GM Truck
If you’re dealing with the frustration of a transmission that slams into gear, hesitates, or throws a ‘Service Transmission’ light on your dash, you’ve come to the right place. As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can make a powerful truck feel unreliable. This isn’t just an annoyance; it’s a critical component failure that affects driveability and safety. This genuine GM TCM, part number 24296206, is the definitive solution for your 2019-2020 Sierra 1500 TCM and other compatible GM vehicles.
The real value here is our complimentary VIN-programming service. Before this module ever leaves our facility, we flash it with the latest official GM software specific to your truck’s Vehicle Identification Number. This means it arrives at your door ready for installation, saving you a costly trip to the dealership for programming. You get a plug-and-play fix that restores the crisp, predictable shifting you expect from your truck.
From the Diagnostic Bay: The Case of the Hesitant Sierra
A customer brought in his 2019 Sierra 1500 complaining of a harsh 1-2 shift and occasional ‘gear hunting’ on the highway. No check engine light was on, which made him second-guess the problem. We hooked up our pro-level scan tool and monitored the transmission data streams. We saw commanded gear and actual gear were out of sync, with delayed solenoid response times. A quick check revealed DTC U0100 (Lost Communication with TCM) stored in another module’s history. Instead of a costly internal transmission repair, the root cause was a failing 2019-2020 Sierra 1500 TCM. A new, programmed module had his truck shifting like it just rolled off the assembly line. This is a classic scenario where pinpoint diagnostics save thousands.
Is Your Truck Exhibiting These Transmission Problems?
A faulty TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Harsh or erratic shifting
- ✔ Delayed engagement when shifting from Park to Drive or Reverse
- ✔ Transmission getting stuck in one gear (limp mode)
- ✔ “Service Transmission” or Check Engine light illumination
- ✔ Common Diagnostic Trouble Codes (DTCs) such as P0700, P0751, P0601, or U0100
- ✔ Poor fuel economy directly related to inefficient shifting
A Straightforward Guide to Installation
Replacing the TCM on these trucks is a job a confident DIYer can handle. On most Sierra and Silverado models, the module is located on the driver’s side core support in the engine bay, making access relatively simple. Always consult a service manual for your specific vehicle.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the systems to discharge completely.
- Locate the TCM: Open the hood and find the TCM, typically mounted to the left (driver’s side) core support, near the radiator.
- Disconnect Wiring: Carefully release the locking tabs on the electrical connectors and unplug them from the old module. Do not force them.
- Remove the Module: Unbolt the old TCM from its mounting bracket. Keep the hardware as you will reuse it.
- Install the New TCM: Mount your new, pre-programmed TCM onto the bracket and secure it with the original hardware.
- Reconnect and Finalize: Plug the electrical connectors firmly into the new module until they click. Reconnect the negative battery terminal. A transmission relearn procedure may be required for optimal performance, which can often be initiated with a capable scan tool or will occur over a short period of driving.
Verified Vehicle Compatibility
This module is a direct-fit replacement for several GM models and supersedes multiple service numbers, ensuring you get the correct, updated part. Please verify your vehicle is on this list. This unit is compatible with service numbers 24042698, 24043411, 24043413, 24289415, and 24296206.
- ✔ 2019-2020 Sierra 1500 / Sierra Denali 1500
- ✔ 2020-2022 Sierra 2500/3500 & Denali 2500/3500
- ✔ 2019-2020 Silverado 1500
- ✔ 2020-2021 Silverado 2500/3500
- ✔ 2022-2023 Camaro
The key to a successful repair is confidence in your parts. This pre-programmed 2019-2020 Sierra 1500 TCM provides a reliable, long-term solution to get your truck’s transmission performing flawlessly again.
Frequently Asked Questions
Do I really need to provide my VIN?
Yes, absolutely. Providing your VIN is critical. We use it to load the precise factory software for your truck’s specific configuration (engine, axle ratio, tire size). This ensures 100% compatibility and proper transmission function right out of the box.
Is any additional programming needed after installation?
No, this TCM arrives fully programmed to your vehicle. In most cases, it is a plug-and-play installation. Some vehicles may benefit from a clutch-volume or solenoid characterization relearn procedure, which can be done with a high-end scan tool or will happen naturally as you drive.
Will this fix my check engine light?
If the check engine light and stored trouble codes (like U0100 or P0700) are being caused by a faulty TCM, then yes, this part will resolve the issue. It’s important to properly diagnose the problem first to ensure the TCM is the root cause.
Where is the TCM located on my 2019 Sierra?
On the 2019-2020 Sierra and Silverado 1500, the Transmission Control Module is typically mounted in the engine bay on the driver’s side (LH) core support, making it much easier to access than older models where it was on the transmission itself.