Restore Flawless Shifting to Your GM Truck
Is your 2019-2020 Sierra 1500 or Silverado exhibiting frustrating transmission problems like harsh, delayed shifts, getting stuck in gear, or displaying a ‘Service Transmission’ warning? You’re not just dealing with an annoyance; you’re facing a failure of the transmission’s nerve center. The Transmission Control Module (TCM) is responsible for every gear change, and when it fails, your truck’s performance and reliability are compromised. This isn’t just a part; it’s the solution to get your powerful truck operating as it should.
As a technician with over two decades of diagnostic experience, I’ve seen firsthand how a faulty TCM can sideline an otherwise perfect vehicle. This part, number 24289415, is a direct-fit, high-quality solution. The best part? We handle the most complicated step for you. Before this module ships, we program it with the latest GM software, precisely matched to your truck’s Vehicle Identification Number (VIN). This means no expensive trips to the dealership for programming—it arrives at your door ready for installation.
Signs Your Sierra’s TCM is Failing
A failing TCM can manifest in several ways, often starting subtly and getting worse. If you’re noticing any of these symptoms, it’s a strong indicator that your module needs attention. I’ve diagnosed hundreds of these, and the patterns are often very clear. Look out for:
- ✔ Erratic or harsh shifting between gears
- ✔ Delayed engagement when shifting from Park to Drive or Reverse
- ✔ The vehicle getting stuck in a single gear (known as ‘limp mode’)
- ✔ ‘Service Transmission’ or Check Engine Light illuminated on the dash
- ✔ Common Diagnostic Trouble Codes (DTCs) stored, such as U0100 (Lost Communication with TCM), P0700 (Transmission Control System Malfunction), or P0606 (ECM/PCM Processor Fault).
Case Study: The ‘Ghost’ Shifting Problem
A customer brought in a 2019 Silverado 1500 with a complaint that felt like a ghost in the machine. It would occasionally slam into gear on the 2-3 shift but then drive perfectly for days. No check engine light was on, but a deep scan showed intermittent U0100 codes stored in history. We checked wiring and connectors—all perfect. Experience pointed to the TCM’s internal processor beginning to fail under specific load conditions. We replaced the module with a VIN-programmed unit like this one, and the problem was solved instantly. The pre-programming saved the customer a full day of vehicle downtime and the extra cost of dealer service.
Your Step-by-Step Installation Roadmap
Installing your new 2019-2020 Sierra 1500 TCM is a straightforward process that a confident DIYer or any professional technician can complete. By having the module pre-programmed, you’ve already skipped the hardest part.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the TCM: On most 2019+ Sierra/Silverado models, the TCM is mounted on the driver’s side (LH) core support, near the front of the engine bay.
- Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware holding the old TCM to its bracket. Keep the hardware, as you will need it for the new module.
- Install the New Module: Mount your new, pre-programmed TCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical connectors back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Check: Start the vehicle and allow it to idle. Check for any warning lights and take it for a test drive to confirm smooth shifting has been restored. No further programming is required.
Verified Vehicle Compatibility
This module, part number 24289415, is a direct replacement for several original service numbers, including 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
What does ‘VIN Programmed’ mean?
It means we load the module with the specific software and calibrations for your exact vehicle using your VIN. This ensures it works correctly right out of the box, just like a part from the dealer, but without the hassle of a dealership visit.
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 the part until we receive this information, as the programming is essential.
Is this a difficult part to install myself?
For someone with basic mechanical skills, this is a very manageable installation. Since the programming is done, it’s a simple ‘unbolt and bolt-on’ process. The main steps are disconnecting the battery, swapping the modules, and reconnecting everything.
Will this fix my ‘Service Transmission’ light?
If the warning light is caused by a faulty TCM (which is very common), then yes, this part is the correct solution. It’s always best to confirm the diagnosis with a scanner that can read transmission codes like U0100 or P0700.
Does this part require any additional relearn procedures?
No. Because this 2019-2020 Sierra 1500 TCM is pre-programmed to your VIN, it does not require any special dealer-level relearn procedures. The vehicle will adapt to the new module during the first few drive cycles.