P0191 on Hyundai
Fuel Rail Pressure Sensor Circuit Range/Performance
P0191 on Hyundai vehicles indicates fuel rail pressure sensor circuit range/performance. Au7o has documented this code across 1 Hyundai model — most commonly on Tucson. 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 Hyundai range from $450 to $800, 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 Hyundai by Model
Hyundai Tucson(1 issue)
- High Pressure Fuel Pump Failure (GDI)2011-2018
The GDI high-pressure fuel pump on 2.4L Tucson models can fail, causing extended crank times, rough idle, and stalling. The pump cam follower wears prematurely, reducing fuel rail pressure below specification. This is especially common above 80,000 miles.
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View P0191 across all makes →Frequently Asked Questions
What does P0191 mean on Hyundai?▼
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 Hyundai specifically, this code is documented across 1 model.
What causes P0191 on Hyundai vehicles?▼
Common causes on Hyundai: 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 Hyundai?▼
Repair costs on Hyundai range from $450 to $800, depending on the specific model and root cause.
Which Hyundai models have P0191 documented?▼
Au7o has documented P0191 on 1 Hyundai model: Tucson.