If your 2011-2012 Sierra Denali 1500 is experiencing frustrating issues like stalling, long crank times, or a sudden no-start condition, a failing Fuel System Control Module (FSCM) is a very likely culprit. This critical component is the brain behind your fuel pump, regulating fuel pressure and delivery to the engine. When it fails, it can leave you stranded and chasing confusing diagnostic codes. Don’t let a faulty module compromise your truck’s performance and reliability.
This is a direct-fit replacement Fuel System Control Module, part number 20877116, designed to restore proper fuel system operation. The biggest advantage we offer is our professional programming service. Before we ship the part, we flash it with the latest GM software updates, specifically calibrated to your truck’s Vehicle Identification Number (VIN). This means you receive a true plug-and-play solution, eliminating the need for an expensive trip to the dealership for programming. Simply install the module, and your truck is ready to go.
Case Study: A Tricky Diagnosis
I remember a 2011 Silverado that came into my shop. The owner was at his wit’s end. The truck would run fine for a while, then suddenly stall at a stoplight. He’d already replaced the fuel pump, thinking that was the obvious fix, but the problem persisted. After hooking up my scan tool, I saw intermittent communication loss with the fuel module. A visual inspection confirmed my suspicion: the original FSCM, mounted on the frame rail, was heavily corroded from years of exposure to road salt and moisture. We installed a new, pre-programmed module, and the truck has run flawlessly ever since. This is a common failure point, and replacing the FSCM often solves fuel delivery issues that are mistakenly blamed on the pump itself.
Is Your Truck Showing These Symptoms?
- ✔ Engine stalls unexpectedly, especially at low speeds or idle.
- ✔ Extended cranking time before the engine starts.
- ✔ Complete no-start condition, even with a good battery.
- ✔ Check Engine Light is on with codes like P069E, P0230, or U0109.
- ✔ Noticeable loss of engine power or hesitation during acceleration.
- ✔ Inconsistent fuel gauge readings or “Reduced Engine Power” message on the dash.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your truck’s battery to prevent any electrical shorts.
- ✔ Locate the Module: On most GM trucks like the Sierra, the FSCM is mounted to the driver’s side frame rail, typically above or near the spare tire.
- ✔ Disconnect and Remove: Carefully unplug the electrical connectors. Be gentle with the locking tabs. Then, remove the bolts or nuts holding the module to the frame.
- ✔ Install the New Module: Bolt the new, pre-programmed FSCM into the same location. Ensure it is securely fastened.
- ✔ Reconnect: Plug the electrical connectors firmly into the new module. You should hear a click as they lock into place.
- ✔ Final Step: Reconnect the negative battery terminal. Start the vehicle to confirm the repair is complete and the symptoms are gone.
By purchasing this pre-programmed 2011-2012 Sierra Denali 1500 FSCM, you are getting a reliable, cost-effective solution that restores your vehicle’s factory performance. We handle the complex programming so you can handle the simple installation.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 20877116, 20791901, 20827745, and 20850927. It fits a wide range of GM vehicles. Please verify your vehicle is on the list below. Providing your VIN during checkout is essential to guarantee we send you a perfectly matched and programmed part.
- ACADIA: 2010-2012
- AVALANCHE 1500: 2010-2012
- CANYON: 2010-2012
- CAPTIVA SPORT: 2012
- COLORADO: 2010-2012
- CTS: 2010-2012
- ENCLAVE: 2010-2012
- ESCALADE / ESV / EXT: 2010-2012
- EXPRESS 1500 VAN: 2010-2012
- HUMMER H3: 2010
- IMPALA: 2012
- LACROSSE: 2010-2012
- OUTLOOK: 2010
- REGAL: 2011-2012
- SAVANA 1500 VAN: 2010-2012
- SIERRA 1500 / DENALI 1500: 2010-2012
- SILVERADO 1500 PICKUP: 2010-2012
- SUBURBAN 1500: 2010-2012
- TAHOE: 2010-2012
- TRAVERSE: 2010-2012
- VUE: 2010
- YUKON / YUKON XL 1500: 2010-2012
Frequently Asked Questions
Frequently Asked Questions
What does the Fuel System Control Module (FSCM) do?
The FSCM acts as a dedicated computer for your fuel pump. It receives commands from the main Engine Control Module (ECM) and precisely controls the voltage sent to the fuel pump, regulating fuel pressure and flow for optimal engine performance and efficiency.
Why do you need my VIN to program the module?
Every vehicle has specific software calibrations. Programming the module with your VIN ensures it has the exact software your truck needs to operate correctly, just like a part from the dealer. This step is crucial for compatibility and prevents performance issues.
Is this part difficult to replace myself?
For most DIYers with basic hand tools, this is a very manageable job. The module is typically located on the vehicle’s frame rail and is accessible without major disassembly. Our plug-and-play programming saves you the most difficult step.
Will this fix a P069E diagnostic trouble code?
Yes, the DTC P069E (Fuel Pump Control Module Requested MIL Illumination) is one of the most common codes indicating a fault within the FSCM. Replacing the module is the standard and effective repair for this code, provided the wiring is intact.
Is this a new or used part?
This is a high-quality, inspected, and tested used OEM part that has been professionally programmed with the latest software for your vehicle, ensuring reliable performance.