P0190 on Subaru
Fuel Rail Pressure Sensor Circuit Malfunction
P0190 on Subaru vehicles indicates fuel rail pressure sensor circuit malfunction. Au7o has documented this code across 2 Subaru models — most commonly on Ascent, Outback. P0190 indicates a malfunction in the fuel rail pressure sensor circuit. This sensor measures the pressure of fuel in the rail (common on direct-injection and high-pressure systems) and reports it to the PCM, which uses it to control the fuel pump and injectors for precise fueling. The code sets when the sensor's signal is out of range, erratic, or electrically faulty. Symptoms can include hard starting, stalling, hesitation, reduced power, or the engine going into a reduced-power fail-safe mode.
Common Causes of P0190
- •Faulty fuel rail pressure sensor
- •Damaged wiring or connector at the sensor
- •Corroded or loose connector terminals
- •Open, short, or poor ground in the sensor circuit
- •Reference voltage problem from the PCM
- •Actual fuel pressure problems (pump/regulator) confusing the sensor
- •Failed PCM input (rare)
P0190 on Subaru by Model
Subaru Ascent(1 issue)
- Denso Low-Pressure Fuel Pump Impeller Failure (Recall 21V-587 / WRG-21)2019-2020
The Denso-supplied low-pressure in-tank fuel pump can develop a swollen/deformed impeller that jams the pump, causing rough running, no-start, or sudden engine stall while driving. ~22,800 Ascents were included in the 165k-vehicle 2021 recall covering MY 2019-2020 Ascents alongside several other Subaru lines.
Subaru Outback(1 issue)
- Denso Fuel Pump Impeller Failure Leading to Stalling or No-Start2020
Certain 2020 Outback vehicles were included in the large Denso low-pressure fuel pump recall affecting many manufacturers. The impeller can deform, causing the pump to seize or lose output, which may result in hard starting, rough running, engine stall, or a no-start condition. This is a documented safety-related defect because loss of propulsion can occur while driving.
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View P0190 across all makes →Frequently Asked Questions
What does P0190 mean on Subaru?▼
P0190 stands for "Fuel Rail Pressure Sensor Circuit Malfunction." P0190 indicates a malfunction in the fuel rail pressure sensor circuit. This sensor measures the pressure of fuel in the rail (common on direct-injection and high-pressure systems) and reports it to the PCM, which uses it to control the fuel pump and injectors for precise fueling. The code sets when the sensor's signal is out of range, erratic, or electrically faulty. Symptoms can include hard starting, stalling, hesitation, reduced power, or the engine going into a reduced-power fail-safe mode. On Subaru specifically, this code is documented across 2 models.
What causes P0190 on Subaru vehicles?▼
Common causes on Subaru: Faulty fuel rail pressure sensor, Damaged wiring or connector at the sensor, Corroded or loose connector terminals, Open, short, or poor ground in the sensor circuit, Reference voltage problem from the PCM. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0190 on a Subaru?▼
Repair costs vary widely depending on the root cause and specific Subaru model.
Which Subaru models have P0190 documented?▼
Au7o has documented P0190 on 2 Subaru models: Ascent, Outback.