Restore Your Truck’s Power and Reliability
If your 2010-2012 GMC Sierra 1500 is suddenly stalling, struggling to start, or throwing a check engine light, a failing Fuel System Control Module (FSCM) is a very likely culprit. This module is the electronic brain that controls your fuel pump, and when it goes bad, it can leave you stranded. Don’t let a faulty module dictate your truck’s performance. This is a direct-fit, VIN-programmed FSCM that gets you back on the road without the dealership’s high costs and long wait times.
As a technician with over two decades of experience, I’ve seen countless fuel-related issues that were misdiagnosed as a bad fuel pump when the real problem was this module. The FSCM on these GM trucks is often mounted on the frame rail, where it’s exposed to water, salt, and vibrations, leading to premature failure. We solve the biggest headache of this repair: the programming. Simply provide your vehicle’s VIN at checkout, and we’ll flash this module with the latest, most stable GM software specifically for your truck. It will arrive at your door ready for a simple, plug-and-play installation.
Is Your Truck Showing These Telltale Signs?
A failing FSCM doesn’t always cause a complete no-start situation right away. It often begins with intermittent issues. Keep an eye out for these common symptoms:
- ✔ Engine cranks but won’t start
- ✔ Stalling, especially under load or when coming to a stop
- ✔ Rough or erratic idle
- ✔ Noticeable loss of engine power and poor acceleration
- ✔ Reduced fuel economy
- ✔ Check Engine Light with codes like P069E (Fuel Pump Control Module Requested MIL Illumination), U0109 (Lost Communication with Fuel Pump Control Module), or P0230 (Fuel Pump Primary Circuit Malfunction)
From the Diagnostic Bay: The Sierra That Wouldn’t Cooperate
I remember a 2011 Sierra 1500 that came into my shop on a tow truck. The owner had already replaced the fuel pump himself, but the truck still wouldn’t start. He was frustrated and out a few hundred dollars. His scanner showed no fuel pressure. My first step wasn’t to check the new pump, but to check the power going to it. Using a multimeter at the FSCM connector, I found power going in from the battery, but nothing coming out to the pump. A quick tap on the module, and for a split second, the pump hummed. The culprit was a classic case of internal failure in the 2010-2012 Sierra 1500 Fuel Module due to corrosion. We installed a pre-programmed module, and the truck fired up on the first try. It’s a powerful reminder to always check the controller before condemning the pump.
A Straightforward Guide to Installation
Replacing the FSCM is a job most DIYers can handle in their own driveway with basic hand tools. Our pre-programmed module makes it even easier.
- Safety First: Disconnect the negative terminal from your truck’s battery.
- Locate the Module: On most Sierra/Silverado models, the FSCM is mounted to the driver’s side frame rail, typically above the spare tire.
- Remove the Old Module: Unplug the electrical connectors. Be gentle with the locking tabs, as they can become brittle. Then, unbolt the module from the frame. It’s usually held on by two or three small bolts.
- Install the New Module: Bolt your new, pre-programmed FSCM into the same location. Apply a small amount of dielectric grease to the connector pins to protect against future corrosion.
- Connect and Finalize: Plug the electrical connectors in firmly until they click. Reconnect your battery terminal. Turn the key to the ‘On’ position for 10 seconds before starting to allow the system to prime. Start your engine and check for proper operation.
Verified Vehicle Compatibility
This module, part number 20791901, is a direct replacement for part numbers 20827745, 20877116, and 20850927. It fits a wide range of GM vehicles. Please verify your vehicle is on the list below. Note that some models have specific options, like the presence of an integrated trailer brake controller, so matching is key.
- Acadia (2010-2012)
- Avalanche 1500 (2010-2012)
- Canyon / Colorado (2010-2012)
- Captiva Sport (2012)
- Enclave (2010-2012)
- Escalade / ESV / EXT (2010-2012)
- Express 1500 Van (2010-2012)
- Hummer H3 (2010)
- Outlook (2010)
- Savana 1500 Van (2010-2012)
- Sierra 1500 / Denali 1500 (2010-2012)
- Silverado 1500 (2010-2012)
- Suburban 1500 (2010-2012)
- Tahoe (2010-2012)
- Traverse (2010-2012)
- Vue (2010)
- Yukon / XL 1500 (2010-2012)
- CTS (2010-2012)
- Impala (2012)
- LaCrosse (2010-2012)
- Regal (2011-2012)
Frequently Asked Questions
Why do I need to provide my VIN?
Your vehicle’s VIN allows us to program the module with the exact software and calibrations specified by GM for your truck’s engine, transmission, and other options. This ensures perfect compatibility and performance right out of the box.
Is this a plug-and-play part?
Yes! Because we program it to your VIN before shipping, no further programming or dealer visit is required. You can install it yourself and it will work immediately.
Where is the FSCM located on my 2011 Sierra 1500?
On most 2010-2012 Sierra and Silverado 1500 trucks, the Fuel System Control Module is located on the driver’s side frame cross-member, often above or near the spare tire.
Can a bad FSCM drain my battery?
While not its most common symptom, it is possible. If the module has an internal short, it could fail to shut down properly and create a parasitic draw on the battery when the vehicle is off.
What happens if I install this without programming?
An unprogrammed module will not work. It won’t be able to communicate with your vehicle’s other computers, like the ECM, and will not operate the fuel pump. That’s why our pre-programming service is essential for a successful repair.