AutoCodes - Gmc - P0191 GMC

P0191 GMC Code - Fuel Rail Pressure Sensor Circuit Range/Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|P0191 GMC code possible causes

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

|How do I fix the P0191 GMC code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P0191 GMC code tech notes

There is a Factory Service Bulletin for the following GMC models:
2006-2010 GMC Savana
2006-2010 GMC Sierra
2006-2010 GMC Topkick
GMC Factory Service Bulletin OBDII Code P0191

|Cost of diagnosing the P0191 GMC code

Labor: 1.0

The cost of diagnosing the P0191 GMC code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0191 GMC code possible symptoms?

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

|P0191 GMC code 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. The Diagnostic Trouble Code (DTC) will be set if the difference between the following parameters is greater than a predefined value of the Fuel Rail Pressure Sensor 1 & Fuel Rail Pressure Sensor 2 for greater than 2.6 s.
OBDII Code P0191 Gmc - Fuel Rail Pressure Sensor Circuit Range/Performance -

|Need more information with the P0191 GMC code?

Need more information on how to fix the P0191 GMC code? Get Access to Factory Service Manuals

|Need help with a P0191 GMC code?

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|P0191 GMC code comments

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Repair Importance Level: 3
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