Restore Your Truck’s Shifting Performance and Reliability
Is your Sierra Denali or Silverado HD suffering from erratic shifting, delayed engagement, or an illuminated check engine light? A failing Transmission Control Module (TCM) is often the culprit behind these frustrating and potentially damaging issues. In my 20+ years as a technician, I’ve seen how a faulty TCM can sideline a perfectly good truck, causing unpredictable behavior that ruins driver confidence. This isn’t just an inconvenience; it’s a critical failure that demands a reliable solution.
We offer a dependable, direct-fit replacement Transmission Control Module, compatible with service part number 24296206. The single biggest advantage we provide is that this module arrives at your door fully programmed with the latest official GM software. Simply provide your vehicle’s VIN at checkout, and my team will flash the module specifically for your truck. This eliminates the need for expensive dealer visits, specialized scan tools, or additional programming fees, saving you significant time and money.
Real-World Repair Story
Real-World Repair Story
A customer brought in his 2021 Sierra 2500 with a complaint that was driving him crazy: intermittent harsh shifting, especially from 2nd to 3rd gear, and a persistent U0100 code (Lost Communication With ECM/PCM ‘A’). We checked the wiring harness and connectors, which all looked pristine. After ruling out physical damage, we knew the issue was internal to the module. Instead of a costly dealer visit, he ordered one of our pre-programmed TCMs. The installation took less than an hour, and a quick test drive confirmed the fix. The shifting was crisp and smooth, and the U0100 code never returned. It’s a straightforward solution to a complex-feeling problem.
Is Your Truck Showing These Symptoms?
A failing TCM can manifest in several ways. If you’re experiencing any of the following, this module is the likely solution for your 2020-2022 Sierra Denali 2500 TCM issues:
- ✔ Unpredictable or harsh gear shifts
- ✔ Getting stuck in one gear (limp mode)
- ✔ Delayed engagement when shifting into Drive or Reverse
- ✔ “Service Transmission” or “Shift to Park” message on the dash
- ✔ Check Engine Light with transmission-related Diagnostic Trouble Codes (DTCs) such as P0700, P0751, or U0100
- ✔ Poor fuel economy due to inefficient shifting
A Straightforward Guide to Installation
Installing your new 2020-2022 Sierra Denali 2500 TCM is a manageable job for a confident DIYer or any professional mechanic. On most Sierra and Silverado models, the module is conveniently located on the driver’s side (LH) core support, making access relatively simple.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the TCM: On your truck, find the module mounted to 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.
- Unbolt the Old Module: Remove the mounting bolts that secure the old TCM to its bracket. Keep the hardware, as you may need to reuse it.
- Mount the New Module: Position your new, pre-programmed TCM and secure it with the mounting bolts.
- Reconnect and Secure: Firmly plug the electrical connectors 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 a short test drive to confirm that shifting performance has been restored.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of General Motors vehicles. Please confirm your model and year from the list below. This part is a replacement for service numbers 24042698, 24043411, 24043413, 24289415, and 24296206.
SIERRA 1500 PICKUP 2019 (New body style) & 2020 (LH core support)
SIERRA 2500 PICKUP 2020-2022 (LH core support)
SIERRA 3500 PICKUP 2020-2022 (LH core support)
SIERRA DENALI 1500 2019-2020 (LH core support)
SIERRA DENALI 2500 2020-2022 (LH core support)
SIERRA DENALI 3500 2020-2022 (LH core support)
SILVERADO 1500 PICKUP 2019 (New body style) & 2020 (LH core support)
SILVERADO 2500 PICKUP 2020-2021 (LH core support)
SILVERADO 3500 PICKUP 2020-2021 (LH core support)
Frequently Asked Questions
Do I need to do any programming myself?
Real-World Repair Story
A customer brought in his 2021 Sierra 2500 with a complaint that was driving him crazy: intermittent harsh shifting, especially from 2nd to 3rd gear, and a persistent U0100 code (Lost Communication With ECM/PCM ‘A’). We checked the wiring harness and connectors, which all looked pristine. After ruling out physical damage, we knew the issue was internal to the module. Instead of a costly dealer visit, he ordered one of our pre-programmed TCMs. The installation took less than an hour, and a quick test drive confirmed the fix. The shifting was crisp and smooth, and the U0100 code never returned. It’s a straightforward solution to a complex-feeling problem.
Is this part compatible with my old part number?
Real-World Repair Story
A customer brought in his 2021 Sierra 2500 with a complaint that was driving him crazy: intermittent harsh shifting, especially from 2nd to 3rd gear, and a persistent U0100 code (Lost Communication With ECM/PCM ‘A’). We checked the wiring harness and connectors, which all looked pristine. After ruling out physical damage, we knew the issue was internal to the module. Instead of a costly dealer visit, he ordered one of our pre-programmed TCMs. The installation took less than an hour, and a quick test drive confirmed the fix. The shifting was crisp and smooth, and the U0100 code never returned. It’s a straightforward solution to a complex-feeling problem.
How do I provide my VIN?
Real-World Repair Story
A customer brought in his 2021 Sierra 2500 with a complaint that was driving him crazy: intermittent harsh shifting, especially from 2nd to 3rd gear, and a persistent U0100 code (Lost Communication With ECM/PCM ‘A’). We checked the wiring harness and connectors, which all looked pristine. After ruling out physical damage, we knew the issue was internal to the module. Instead of a costly dealer visit, he ordered one of our pre-programmed TCMs. The installation took less than an hour, and a quick test drive confirmed the fix. The shifting was crisp and smooth, and the U0100 code never returned. It’s a straightforward solution to a complex-feeling problem.
Will this fix my check engine light?
Real-World Repair Story
A customer brought in his 2021 Sierra 2500 with a complaint that was driving him crazy: intermittent harsh shifting, especially from 2nd to 3rd gear, and a persistent U0100 code (Lost Communication With ECM/PCM ‘A’). We checked the wiring harness and connectors, which all looked pristine. After ruling out physical damage, we knew the issue was internal to the module. Instead of a costly dealer visit, he ordered one of our pre-programmed TCMs. The installation took less than an hour, and a quick test drive confirmed the fix. The shifting was crisp and smooth, and the U0100 code never returned. It’s a straightforward solution to a complex-feeling problem.
What if I have questions during installation?
Real-World Repair Story
A customer brought in his 2021 Sierra 2500 with a complaint that was driving him crazy: intermittent harsh shifting, especially from 2nd to 3rd gear, and a persistent U0100 code (Lost Communication With ECM/PCM ‘A’). We checked the wiring harness and connectors, which all looked pristine. After ruling out physical damage, we knew the issue was internal to the module. Instead of a costly dealer visit, he ordered one of our pre-programmed TCMs. The installation took less than an hour, and a quick test drive confirmed the fix. The shifting was crisp and smooth, and the U0100 code never returned. It’s a straightforward solution to a complex-feeling problem.