P0191 on Chevrolet
Fuel Rail Pressure Sensor Circuit Range/Performance
P0191 on Chevrolet vehicles indicates fuel rail pressure sensor circuit range/performance. Au7o has documented this code across 1 Chevrolet model — most commonly on Traverse. 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 Chevrolet range from $600 to $1,400, 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 Chevrolet by Model
Chevrolet Traverse(1 issue)
- Camshaft-Driven High-Pressure Fuel Pump Failure (Direct-Injection 3.6L) — Long Crank, No-Start, Low Rail Pressure2009-2023
Every direct-injected 3.6L V6 in the Traverse runs a cam-driven high-pressure fuel pump mounted in the valley that steps rail pressure up past 2,000 PSI. The pump's internal plunger seal and check valve wear, and the follower/cam lobe interface can wear as well, so rail pressure falls below the commanded value. Owners see progressively longer crank times, then a hot-restart no-start, then a hard stumble and reduced power under load. A failing pump can also dilute the engine oil with fuel, which accelerates every other wear item on an engine already known for timing chain and phaser trouble. Traverse Forum carries multi-page HPFP replacement threads across the LLT, LFX and LFY.
Looking for P0191 on a different make?
View P0191 across all makes →Frequently Asked Questions
What does P0191 mean on 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 specifically, this code is documented across 1 model.
What causes P0191 on Chevrolet vehicles?▼
Common causes on Chevrolet: 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 Chevrolet?▼
Repair costs on Chevrolet range from $600 to $1,400, depending on the specific model and root cause.
Which Chevrolet models have P0191 documented?▼
Au7o has documented P0191 on 1 Chevrolet model: Traverse.