P0191 on Genesis
Fuel Rail Pressure Sensor Circuit Range/Performance
P0191 on Genesis vehicles indicates fuel rail pressure sensor circuit range/performance. Au7o has documented this code across 1 Genesis model — most commonly on G70. 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.
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 Genesis by Model
Genesis G70(1 issue)
- High-Pressure Fuel Pump Failure Causing Power Loss (Recall 24V-528 / 023G)2019-2023
The fuel control valve inside the high-pressure fuel pump (HPFP) can stick or allow excess fuel into the system, producing an air/fuel mixture that runs too rich. This causes a reduction or loss of motive power at low speeds, rough running, and check-engine warnings — increasing crash risk. Genesis recalled certain 2019-2023 G70 vehicles under NHTSA campaign 24V-528 (Genesis recall 023G); owner letters mailed September 2024. Many owners also reported the symptom (hesitation/near-stall when driving off within ~30 seconds of a cold start) before the formal recall. The remedy is an ECM software update plus inspection and replacement of the HPFP assembly as necessary, performed free of charge under the recall.
Looking for P0191 on a different make?
View P0191 across all makes →Frequently Asked Questions
What does P0191 mean on Genesis?▼
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 Genesis specifically, this code is documented across 1 model.
What causes P0191 on Genesis vehicles?▼
Common causes on Genesis: 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 Genesis?▼
Repair costs vary widely depending on the root cause and specific Genesis model.
Which Genesis models have P0191 documented?▼
Au7o has documented P0191 on 1 Genesis model: G70.