Restore Your Truck’s Performance and Reliability
If your 2015-2016 Sierra Denali 1500 is suffering from erratic shifting, a persistent check engine light, or a ‘Service Transmission’ message, a failing Transmission Control Module (TCM) is the most likely culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty TCM can make a powerful truck feel unpredictable and unsafe. This isn’t just an annoyance; it’s a critical component failure that affects your vehicle’s drivability and longevity. This replacement TCM, part number 24276411, is the definitive solution to get your truck operating like new again.
The biggest hurdle with electronic module replacement has always been the expensive and time-consuming programming required at a dealership. We eliminate that problem completely. When you purchase this module, we flash it with the latest official GM software, specifically calibrated to your truck’s Vehicle Identification Number (VIN). This means it arrives at your door ready for a straightforward, plug-and-play installation. You get a reliable fix without the extra cost and hassle of a dealer appointment, restoring the crisp, decisive shifts you expect from your Sierra Denali.
Is Your Sierra Showing These Transmission Warning Signs?
- ✔ Harsh or delayed shifting between gears
- ✔ The vehicle feels stuck in one gear (limp mode)
- ✔ Check Engine Light is on with transmission-related codes
- ✔ Common Diagnostic Trouble Codes (DTCs) stored, such as P0700 (Transmission Control System Malfunction), U0100 (Lost Communication With TCM), or solenoid performance codes (P0751, P0756, etc.)
- ✔ ‘Service Transmission’ or other warnings on your driver information center
- ✔ Unexplained loss of power or poor fuel economy
A Technician’s Notebook
I recently had a 2015 Sierra 1500 in the bay with a frustrating, intermittent problem. The owner complained of a hard 1-2 shift, but only after the truck was fully warmed up. There were no active codes, just a stored U0100 history code. We checked wiring and fluid levels, which were perfect. On a hunch, we monitored live data and saw the TCM would briefly drop communication when the transmission temperature hit 190°F. The internal electronics of the original module were failing under heat soak. We replaced it with a VIN-programmed 2015-2016 Sierra Denali TCM like this one. The problem was immediately solved. The pre-programming saved us hours and got the customer’s work truck back on the road the same day.
A Straightforward Guide to 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 your Sierra Denali, the TCM is typically mounted on the driver’s side of the radiator core support, near the front of the engine bay.
- ✔ Disconnect Wiring: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Do not force them. Inspect the connectors for any corrosion or damage.
- ✔ Remove the Old Module: Unbolt the old TCM from its mounting bracket. It’s usually held in place by a few small bolts (commonly 10mm).
- ✔ Install the New Module: Mount your new, pre-programmed TCM onto the bracket and secure it with the bolts.
- ✔ Reconnect and Secure: Plug the electrical connectors firmly 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 that shifting is smooth and normal. No further programming is required.
Verified Fitment For a Wide Range of GM Vehicles
This module is a direct replacement for part numbers 24276411 and 24272004 and is guaranteed to fit the following vehicles. Please ensure your vehicle and options match the list below. The key is providing your VIN so we can ensure perfect software compatibility.
CTS 16 (LH front rail), ID 24276411
ESCALADE 15-17 (LH radiator), (8 speed, opt M5U)
ESCALADE ESV 15-17 (LH radiator), (8 speed, opt M5U)
SIERRA 1500 PICKUP 15-16 (LH core support), (8 speed, opt M5U)
SIERRA 2500/3500 PICKUP 15-16 (LH fan shroud), (AT, 6 speed, opt MW7)
SIERRA DENALI 1500 15-16 (LH core support)
SIERRA DENALI 2500/3500 15-16 (LH fan shroud), (AT, 6 speed, opt MW7)
SILVERADO 1500 PICKUP 15-16 (LH core support), (8 speed, opt M5U)
SILVERADO 2500/3500 PICKUP 15-16 (LH fan shroud), (AT, 6 speed, opt MW7)
YUKON & YUKON XL 1500 15-16 (LH radiator), (8 speed, opt M5U)
Frequently Asked Questions
Frequently Asked Questions
What is a TCM and what does it do?
The Transmission Control Module (TCM) is a computer that acts as the brain for your automatic transmission. It reads data from various sensors to control shift points, line pressure, and torque converter clutch operation for optimal performance and fuel efficiency.
Do I really need to provide my VIN?
Yes, absolutely. Providing your VIN is critical. We use it to load the precise GM factory software for your vehicle’s specific configuration (engine, axle ratio, tire size, etc.). This ensures 100% compatibility and proper transmission function right out of the box.
Will this module require any additional programming?
No. The main benefit of our service is that this TCM arrives fully programmed and ready for installation. You will not need to visit a dealer or use a high-end scan tool for programming, saving you significant time and money.
Where is the TCM located on my 2016 Sierra Denali 1500?
For your specific model, the TCM is located on the driver’s side (LH) of the radiator core support in the engine bay. It’s relatively easy to access for replacement.
Will this fix a P0700 trouble code?
A P0700 code is a general fault code indicating the TCM has detected a problem and has requested the Check Engine Light to be turned on. While this module often resolves the root cause, it’s wise to have the vehicle scanned to see if other specific codes (like for a sensor or solenoid) are present.