P0191: Fuel Rail Pressure Sensor Circuit Range/Performance
22 vehicles · 12 makes · $150-$18,000 repair
Most Reported On
P0191 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2019-2025 RAM 2500 (Big Horn, Laramie, Laramie Longhorn, Limited, Limited Longhorn, Lone Star, Rebel, SLT, Tradesman), 2011-2016 Ford F-250 Super Duty, and 2007-2012 MINI Cooper S, plus 19 other vehicles, with repair costs ranging from $150 to $18,000.
Common Causes
Typical Repair Cost
Based on 22 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0191, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (22)
High-Pressure Fuel Pump (HPFP) Failure
High-Pressure Fuel Pump (HPFP) Premature Failure
High-Pressure Fuel Pump (HPFP) Failure
High-Pressure Fuel Pump (HPFP) Failure (N14/N18/B48 Turbo DI)
FAQ
What does P0191 mean?
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.
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?
Repair costs for P0191 range from $150 to $18,000, depending on the vehicle and root cause.
Which vehicles are affected by P0191?
Au7o has documented P0191 across 22 vehicle models from 12 manufacturers: Alfa Romeo, Audi, BMW, Ford, GMC, Hyundai, Jeep, Land Rover, MINI, RAM, Toyota, Volkswagen.
Sources (12)
- ForumFord Powerstroke Forum - F250 6.7 High Pressure Fuel Pump Failure
- articleBanks Power - Ford's 6.7L Turbo Failure and CP4 Issues
- mediaMotor Biscuit: Ram and Jeep Recall EcoDiesel V6 Models Fuel Pump Problems
- manufacturerDieselogic: 2014-2019 Ram 1500 3.0L EcoDiesel High Pressure Fuel Pump Failure Kit
- manufacturerDiesel Power Products: CP4 Failure Symptoms, Causes, Prevention, & Upgrades
- ForumRAM 1500 Diesel Forum: CP4 High Pressure Fuel Pump Failure
- mediaPR Newswire: Federal Judge Rejects GM Argument that Fuel Pump Defect Mere Inconvenience
- mediaPR Newswire: Federal Judge Certifies Seven State Classes in CP4 Fuel Pump Defect Class Action
- ForumDuramax Forum: GM Fuel Pump Litigation (CP4 failure)
- otherCarComplaints: GM Duramax Diesel CP4 Fuel Pump Lawsuit Settlement
- manufacturerClass Law Group: Court Grants Final Approval to GM Fuel Pump CP4 Class Action Settlement
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.