Restore Flawless Shifting to Your GM Truck or Car
Is your 2019-2020 Sierra Denali 1500, Silverado, or even your Camaro suffering from erratic transmission behavior? As a technician with over two decades of experience, I’ve seen firsthand how a failing Transmission Control Module (TCM) can turn a reliable vehicle into a source of daily frustration. You might be experiencing harsh, clunky shifts, a frustrating delay when shifting into drive or reverse, or a check engine light that just won’t go away. These aren’t just annoyances; they’re signs that the brain of your transmission is in trouble.
This is the definitive solution: a direct-fit Transmission Control Module, service part number 24296206 (interchangeable with 24289415, 24042698, 24043411, 24043413). The best part? We handle the most complicated step for you. Simply provide your vehicle’s VIN at checkout, and we will program the module with the very latest GM-certified software. It arrives at your door ready for a straightforward, plug-and-play installation, saving you from a costly trip to the dealership and their programming fees. This isn’t just a replacement part; it’s a complete fix that restores your vehicle’s original performance and reliability.
Case Study: A Tricky Diagnosis
A few months back, a 2019 Silverado 1500 came into my shop. The owner was at his wit’s end. He described intermittent, jarring shifts, especially between 1st and 2nd gear, but no check engine light. We drove it, and of course, it shifted perfectly. We checked for codes, and nothing was stored. This is a classic symptom of an early-stage TCM failure. The internal electronics or solder joints begin to fail under certain temperature or vibration conditions, but not consistently enough to log a permanent fault code. We explained the situation, and instead of waiting for it to get worse and potentially leave him stranded, he opted to replace the TCM. We installed a pre-programmed unit just like this one. The result? The shifting problems vanished immediately. He called a week later to say his truck drove better than it had in years. This is why addressing the core electronic issue with a properly programmed 2019-2020 Sierra Denali TCM is the only reliable repair.
Is Your Truck Exhibiting These Transmission Issues?
A faulty TCM can manifest in several ways. If you’re noticing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Harsh, abrupt, or jerky shifting between gears.
- ✔ Delayed engagement when shifting from Park into Drive or Reverse.
- ✔ The transmission seems to get stuck in one gear (limp mode).
- ✔ A lit Check Engine Light with transmission-related codes like P0700 (Transmission Control System Malfunction) or U0100 (Lost Communication With TCM).
- ✔ Poor fuel economy due to inefficient shifting patterns.
- ✔ Unpredictable transmission behavior that changes with vehicle temperature.
A Straightforward Guide to Installation
Replacing the TCM on these GM trucks is a job many DIYers or any professional mechanic can handle. The module is typically located on the driver’s side (LH) core support in the engine bay, making it accessible. Always consult a service manual for your specific vehicle, but here is a general guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait a few minutes for the systems to discharge.
- Locate the TCM: Open the hood and find the module on the left-hand (driver’s side) core support, near the radiator.
- Disconnect Wiring: Carefully release the locking tabs on the electrical connectors and pull them straight out. Do not force them. Inspect connectors for any corrosion or damage.
- Remove Mounting Bolts: Unbolt the module from its mounting bracket. There are typically two or three bolts holding it in place.
- Install the New Module: Seat the new, pre-programmed TCM onto the bracket and secure it with the mounting bolts.
- 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 check for any warning lights. Take it for a test drive to confirm the shifting is smooth and responsive. No further programming is required!
Verified Vehicle Compatibility
This module is guaranteed to be a direct-fit replacement for the following vehicles, provided the options match. It’s crucial to confirm your vehicle is on this list before ordering. This single part covers a wide range of popular GM models:
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
Do I need to do any programming or flashing after I install this?
No. This is the biggest benefit of our service. We program the module to your vehicle’s specific VIN before we ship it. It arrives ready for installation, with no need for expensive scan tools or a trip to the dealer.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically add it as a note during checkout or send it to us in a message referencing your order number. We cannot ship the part until we have your VIN.
Will this fix my truck’s hard shifting problem?
In the vast majority of cases, yes. The symptoms described, such as harsh shifting, delayed engagement, and limp mode, are hallmark signs of a failing TCM. Replacing it with a new module containing the latest software calibration is the standard, effective repair.
Is this an authentic GM part?
Yes, this is a genuine OEM-spec part that meets or exceeds original equipment standards. We program it using official GM software updates to ensure perfect compatibility and performance for your vehicle.
Where is the TCM located on my 2019 Sierra?
For the 2019-2020 Sierra and Silverado models, the Transmission Control Module is typically mounted to the left-hand (driver’s side) radiator core support in the engine compartment, making it relatively easy to access.