P0191 on Hyundai: How to Diagnose & Fix
Fuel Rail Pressure Sensor Circuit Range/Performance
1 Hyundai model · 1 documented issue · $450-$800 repair
P0191 on Hyundai by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Long crank before starting
- Rough idle especially when cold
- Engine stalling at stops
- P0087 low fuel rail pressure code
- Hesitation under acceleration
How to Fix
Diagnose by checking fuel rail pressure with a scan tool (should be 500-2,000 PSI depending on load). Replace the high-pressure fuel pump (Hyundai part 35320-2G740). Also inspect and replace the cam follower/roller. Parts cost $250-400, labor $200-400. Total $450-800.
What you need to diagnose it
The repair instructions explicitly call for reading stored codes. Use a scanner that can read the named code families before choosing a repair.The recommended scanner supports these code families; confirm your exact year, model and module coverage before buying.
ANCEL AD310 Classic OBD-II Scanner
Read & clear engine (P) codes
$20–$40View
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Reading and clearing the code is DIY work. Module replacement or reprogramming is not — most modules are VIN-programmed, so a new one does nothing until a shop codes it to your car. Check for an open recall or service bulletin before buying anything.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Hyundai high-pressure fuel pumpOEMHyundai 35320-2G740
Confirm VIN/build/original number because an intervening production r
- Genuine Hyundai high-pressure-pump roller tappetOEMHyundai 35325-2G700
Confirm VIN/engine and inspect the cam lobe; it is not pr
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Owner tips & cautions
- TipUse Top Tier gasoline to reduce carbon buildup on the fuel pump cam follower
Sources for this issue (2)
P0191 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0191 mean on a 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 it is documented across 1 model: Tucson.
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 on a Hyundai?
Published repair estimates on Hyundai range from $450 to $800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0191 on a different make?
View P0191 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.