P0191 2017 GMC Sierra Code - Fuel Rail Pressure Sensor Performance
Quick Answer
The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) sensor to constantly adjust the high-pressure fuel pump's feed rate so that the ideal pressure is permanently maintained in the high-pressure section (between the high-pressure fuel pump and the injectors) by means of closed-loop control. Common causes include Low or no fuel, Faulty Fuel Rail Pressure (FRP) Sensor, Fuel Rail Pressure harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0191 2017 GMC Sierra indicates Fuel Rail Pressure Sensor Performance.
- Common causes
- Common causes include Low or no fuel, Faulty Fuel Rail Pressure (FRP) Sensor, Fuel Rail Pressure harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0191 2017 GMC Sierra Description
What are the Possible Causes of the DTC P0191 2017 GMC Sierra?
- 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 to Fix the DTC P0191 2017 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0191 2017 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0191 2017 GMC Sierra code?
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Frequently Asked Questions about P0191 2017 GMC Sierra Code
1. What does the OBDII code P0191 mean on a 2017 GMC Sierra?
P0191 indicates an issue with the fuel rail pressure sensor's performance, meaning the sensor is reporting values outside the expected range.
2. What are common symptoms of code P0191 in a 2017 GMC Sierra?
Symptoms may include poor engine performance, difficulty starting, stalling, reduced fuel efficiency, and a check engine light.
3. What causes the P0191 code on a GMC Sierra?
Common causes include a faulty fuel rail pressure sensor, wiring or connector issues, fuel pump problems, or a clogged fuel filter.
4. Can I drive my 2017 GMC Sierra with the P0191 code?
While it may still be drivable, continued operation could cause further damage or leave you stranded if the issue worsens. It's best to address the problem promptly.
5. How do I diagnose the P0191 code on my GMC Sierra?
Diagnose by inspecting the fuel rail pressure sensor, checking for damaged wiring or connectors, and testing fuel pressure with a gauge.
6. How much does it cost to fix the P0191 code on a GMC Sierra?
Repairs can range from $100 to $500, depending on whether you need to replace the fuel rail pressure sensor, repair wiring, or address fuel system issues.
7. Can a dirty fuel filter cause the P0191 code on a GMC Sierra?
Yes, a clogged fuel filter can restrict fuel flow, leading to incorrect pressure readings and triggering the P0191 code.
8. How do I reset the P0191 code after repairs?
You can clear the code using an OBDII scanner, but ensure the root cause is fixed to prevent the code from returning.
9. Does the P0191 code always require sensor replacement?
No, the issue could be due to wiring, fuel system problems, or other components. Proper diagnosis is essential before replacing the sensor.
10. Can low-quality fuel cause the P0191 code on a GMC Sierra?
Yes, contaminated or poor-quality fuel can affect fuel pressure and sensor readings, potentially triggering the code.
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