P0191 on Jeep
Fuel Rail Pressure Sensor Circuit Range/Performance
P0191 on Jeep vehicles indicates fuel rail pressure sensor circuit range/performance. Au7o has documented this code across 1 Jeep model — most commonly on Grand Wagoneer. 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. Typical repair costs on Jeep range from $600 to $2,200, depending on the specific model and root cause.
Common Causes of P0191
- •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
P0191 on Jeep by Model
Jeep Grand Wagoneer(1 issue)
- Fuel system fault / stalling or no-start related to low-pressure fuel pump module2022-2024
NHTSA complaints and owner reports describe intermittent stalling, extended crank, or no-start events on Grand Wagoneer that are consistent with low fuel pressure delivery issues. Some cases point to in-tank fuel pump module performance problems or electrical supply/connectivity issues causing pressure drop under load.
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View P0191 across all makes →Frequently Asked Questions
What does P0191 mean on Jeep?▼
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 Jeep specifically, this code is documented across 1 model.
What causes P0191 on Jeep vehicles?▼
Common causes on Jeep: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0191 on a Jeep?▼
Repair costs on Jeep range from $600 to $2,200, depending on the specific model and root cause.
Which Jeep models have P0191 documented?▼
Au7o has documented P0191 on 1 Jeep model: Grand Wagoneer.