P0191 CHEVROLET - Fuel Rail Pressure Sensor Circuit Range/Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

Possible causes

  • Low or no fuel
  • Faulty Rail Pressure (FRP) Sensor
  • Faulty Rail Pressure (FRP) harness is open or shorted
  • Faulty Rail Pressure (FRP) circuit poor electrical connection
  • Faulty Fuel Pump

Tech notes

There is a factory service bulletin for the following Chevrolet models:

2006-2010 Chevrolet Express
2006-2010 Chevrolet Kodiak
2006-2010 Chevrolet Silverado
Chevrolet Factory Service Bulletin OBDII Code P0191

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Engine will not start

P0191 Chevrolet Description

The Fuel Rail Pressure (FRP) sensor has a 5-volt reference circuit, a signal circuit, and a low reference circuit. The Engine Control Module (ECM) monitors the voltage on the FRP sensor circuits. When the fuel pressure is high, the signal voltage is high. When the fuel pressure is low, the signal voltage is low. The fuel pressure regulator has a solenoid supply voltage circuit and a solenoid control circuit. The ECM controls the fuel pressure regulator, which regulates high pressure fuel that goes to the fuel injector rails and the injectors.

OBDII Code P0191 Chevrolet - Fuel Rail Pressure Sensor Circuit Range/Performance - Engine-Codes.com
Repair Importance Level: 3
 
1=Low 2=Medium 3=High  
Repair Difficulty Level: 3
 
1=Easy 2=Moderate 3=Hard  
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