Is Your GM Truck or SUV Stalling or Refusing to Start?
You turn the key, the engine cranks and cranks, but it just won’t fire up. Or maybe it starts, but then stalls unpredictably at a stoplight, leaving you stranded. These are frustrating and common symptoms, and often, the root cause isn’t the fuel pump you might suspect, but the small electronic box that tells it what to do: the Fuel System Control Module (FSCM).
The Hidden Culprit: Your GM Fuel Control Module
Over my 20+ years in the shop, I’ve seen this exact scenario play out hundreds of times, especially on GM trucks and SUVs from this era. The FSCM is often mounted on the frame rail, exposed to years of road salt, water, and vibration. This exposure leads to corrosion on the circuit board and connectors, causing it to fail. When it does, it can no longer send the correct voltage to the fuel pump, leading to a host of fuel delivery problems.
Real-World Diagnosis: “A customer’s 2011 Silverado 1500 was towed in last month. It would crank all day but never fire up, and the fuel pressure gauge read zero. The owner had already replaced the in-tank fuel pump with no luck. A quick check with a multimeter at the FSCM connector showed 12V going in, but nothing coming out to the pump. The module itself was swollen and the aluminum casing was white with corrosionโa dead giveaway. This is a story I’ve seen dozens of times on these trucks.”
Plug-and-Play Solution: Programmed & Ready to Install
The biggest headache with replacing an FSCM has always been the required dealer programming. We eliminate that step completely. This isn’t just a part in a box; it’s a complete solution. Simply provide us with your vehicle’s VIN during checkout, and we will program the module with the latest, most stable GM software specifically for your vehicle. It arrives at your door ready to be installed.
- โ VIN-Programmed for You: Arrives ready for installation with the latest GM software. No dealer visit needed!
- โ Fixes Common Issues: Solves no-start, intermittent stalling, hesitation, and fuel-related check engine lights (P069E, P0230, U0109).
- โ Restores Fuel Pressure: Ensures your fuel pump gets the correct voltage for reliable engine performance.
- โ Direct Replacement: A direct fit for part numbers 20791901, 20827745, 20877116, and 20850927.
Simple Installation Guide
Installation is straightforward for a DIYer with basic tools. While the location can vary slightly, on most trucks and SUVs (Silverado, Sierra, Tahoe, Yukon, Escalade), you’ll find it on the driver’s side frame rail, near the spare tire.
- Safety First: Disconnect the negative battery terminal.
- Locate the Module: Find the old FSCM, typically mounted to the frame or a crossmember.
- Disconnect: Carefully unplug the electrical connectors. Press the release tabs firmly. Inspect the connectors for any corrosion and clean them with contact cleaner if necessary.
- Unbolt: Remove the bolts holding the old module to the frame.
- Install New Module: Bolt the new, pre-programmed module in place.
- Reconnect: Plug the electrical connectors into the new module until they click securely.
- Power Up: Reconnect the negative battery terminal. Turn the key to the ‘ON’ position (without starting) for 5-10 seconds to allow the fuel pump to prime the system. Start your vehicle and confirm the issue is resolved.