P0191 on Chevrolet: How to Diagnose & Fix
Fuel Rail Pressure Sensor Circuit Range/Performance
1 Chevrolet model · 1 documented issue
P0191 on Chevrolet by model: symptoms, diagnosis and fix
GM opened customer satisfaction/field action N232432960 covering replacement of the fuel rail pressure sensor on affected 2024 vehicles because the sensor's output can shift out of specification over time. On the direct-injected 1.2L turbo the ECM trims high-pressure fuel delivery directly from this sensor, so a drifting signal shows up as a hard or extended crank, a rough or surging idle, a stumble under load, and a check engine light for fuel rail pressure performance. Because the symptom set overlaps the far more serious rod-knock complaints, it is worth ruling in or out first: a pressure-sensor fault produces a stumble and a stored fuel code, not a mechanical bang. Early 1.2L builds have also drawn complaints about injectors that clog or stick, which produces a similar rough idle and a misfire code on a single cylinder.
Common Symptoms
- Long or hard crank before starting
- Rough or surging idle
- Stumble or hesitation under acceleration
- Check engine light for fuel rail pressure performance
- Single-cylinder misfire after the car sits
How to Fix
Have the dealer check the VIN against field action N232432960 - if it applies, the fuel rail pressure sensor is replaced free of charge. Otherwise the sensor is a straightforward warranty or roughly $200-$400 repair. If the fault is a sticking or clogged injector instead, GM's intake and injector decarbonizing procedures (bulletins 16-NA-383 and 04-06-04-051H) are the first step before condemning an injector; a single-cylinder misfire that survives cleaning means injector replacement, roughly $350-$600 for one on this engine. Running TOP TIER detergent gasoline is GM's own documented preventive measure for this engine family.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
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 Chevrolet?
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 Chevrolet it is documented across 1 model: Trax.
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 Chevrolet?
Repair costs vary widely with the root cause and Chevrolet model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.