Is Your 2010 Hummer H3 Stalling or Refusing to Start?
There’s nothing more frustrating than turning the key in your Hummer and getting nothing but a crank, or having the engine die unexpectedly in traffic. If you’re experiencing these issues, a faulty Fuel System Control Module (FSCM) is a very likely culprit. Located on the rear frame, this critical component is exposed to road salt, water, and vibration, making it a common failure point. Over my 20+ years in the shop, I’ve seen this exact failure dozens of times on GM trucks and SUVs, leaving owners stranded.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a genuine GM module and program it specifically to your vehicle’s VIN before it leaves our facility. This means it arrives at your door with the latest GM software updates, ready for a true plug-and-play installation. You get to skip the expensive tow to the dealership and the high cost of their programming service.
Key Symptoms of a Failing FSCM:
- ✔ Engine cranks but will not start
- ✔ Vehicle starts and then immediately stalls
- ✔ Hesitation or stumbling during acceleration
- ✔ Check Engine Light with fuel system related codes (like P069E or P0230)
- ✔ Reduced engine power message on the dash
From the Shop Floor: A Real-World Diagnosis
A customer’s 2010 Hummer H3 was towed in last month with the classic ‘crank-no-start’ symptom. The fuel gauge read half-full, but a pressure test at the fuel rail showed zero PSI. Before condemning the expensive in-tank fuel pump, we checked the FSCM. A quick tap on the module housing while a helper cranked the engine momentarily brought the pump to life. This confirmed our suspicion: an internally failed FSCM. This simple diagnostic step saved the customer hundreds by avoiding an unnecessary fuel pump replacement. This module solved his problem in under 30 minutes.
Plug-and-Play Installation: No Dealer Visit Required
Replacing the 2010 Hummer FSCM is a straightforward job you can do in your own driveway. Because we handle all the programming, you don’t need any special scan tools. Just provide your VIN at checkout, and we’ll do the rest.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the Module: On the Hummer H3, the FSCM is typically mounted to the inside of the rear frame rail, near the spare tire.
- Disconnect and Remove: Unplug the electrical connector. Before plugging in the new module, inspect the vehicle-side harness connector for any corrosion or bent pins and clean it with electrical contact cleaner if necessary. Then, unbolt the old module from the frame.
- Install the New Module: Bolt the new, pre-programmed FSCM into place and securely reconnect the electrical harness.
- Final Steps: Reconnect the negative battery terminal. Turn the key to the ‘On’ position for 10 seconds before starting to allow the system to prime. Start your engine and enjoy a reliable ride!
Guaranteed Compatibility
This module is a direct replacement for several GM part numbers, ensuring a perfect fit and function. It is compatible with part numbers: 20791901, 20827745, 20877116, and 20850927. While this listing is focused on the Hummer H3, this FSCM also fits a massive range of GM vehicles, including the Chevrolet Silverado, Tahoe, Suburban, Cadillac Escalade, and GMC Sierra. Please verify your part number or use the fitment chart to confirm compatibility with your specific model.