P0191 on Alfa Romeo: How to Diagnose & Fix
Fuel Rail Pressure Sensor Circuit Range/Performance
2 Alfa Romeo models · 2 documented issues · 2 critical · $200-$2,000 repair
P0191 on Alfa Romeo by model: symptoms, diagnosis and fix
2017+ Giulias can experience sudden engine stall or no-start due to a defective low-pressure fuel pump inside the fuel delivery module. The pump's internal commutator wears prematurely and loses contact, cutting fuel supply at any speed. NHTSA recall 25V-586 (Stellantis campaign 93C) covers free replacement. Symptoms include stalling at idle, no-start hot, and intermittent fuel pump prime noise from the rear of the vehicle. Failures cluster at 30,000-80,000 miles.
Common Symptoms
- Engine stalls while driving
- No-start condition
- Multiple warning lights
- Loss of electrical power
How to Fix
Have the ECM and wiring harness inspected at an Alfa Romeo dealer. FCA has issued TSB 18-024-17 REV.A addressing the wiring harness routing. ECM replacement with updated software may be required.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (1)
2018+ Stelvios can experience sudden engine stall or no-start due to a defective low-pressure fuel pump inside the fuel delivery module — same defect as the Giulia, same supplier, same NHTSA timeline. The pump's internal commutator wears prematurely and loses contact, cutting fuel supply at any speed. NHTSA recall 25V-667 (Stellantis campaign 93C) covers free replacement. Failures cluster at 30,000-80,000 miles; stalls reported at highway speed make this safety-critical until repaired.
Common Symptoms
- Engine stalls at speed
- Intermittent no-start
- Dashboard warning light cluster
- Power loss while driving
How to Fix
Inspect and repair the ECM harness per FCA TSB 18-024-17 REV.A. Clean and reseal all engine bay ground points. ECM replacement with updated calibration may be needed for persistent cases.
Sources for this issue (1)
P0191 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0191 mean on a Alfa Romeo?
P0191 stands for "Fuel Rail Pressure Sensor Circuit Range/Performance." This code sets when the fuel rail pressure sensor's signal is out of its expected range or doesn't match what the computer expects for current conditions. On direct-injection and many modern engines, this sensor reports fuel pressure in the rail so the computer can precisely control fueling and the fuel pump. When the reading is implausible — too steady, erratic, or inconsistent with commanded pressure — this code is set, sometimes with hard starting, hesitation, or reduced power. It generally points to the sensor or its wiring, though an actual fuel-pressure problem can also trigger it. On Alfa Romeo it is documented across 2 models: Giulia, Stelvio.
What are the most common causes of P0191?
The most common causes of P0191 are: Faulty fuel rail pressure sensor, Corroded, loose, or damaged sensor connector, Open, shorted, or high-resistance sensor wiring, Actual fuel pressure out of range (weak pump or regulator), Restricted fuel filter or supply line, Loss of reference voltage or ground from the ECM/PCM, Faulty fuel pressure regulator or control valve. The specific cause varies by vehicle.
How much does it cost to fix P0191 on a Alfa Romeo?
Published repair estimates on Alfa Romeo range from $200 to $2,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0191 on a different make?
View P0191 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.