AutoCodes – Dodge – P0191 Dodge

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

Quick Answer

This Diagnostic Trouble Code (DTC) is mapped to an idle diagnostic and runs only at idle. 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 Dodge indicates Fuel Rail Pressure Sensor Circuit Range/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.

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Code Popularity 402

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 04, 2023

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0191 Dodge Description

This Diagnostic Trouble Code (DTC) is mapped to an idle diagnostic and runs only at idle. The key-on error monitors fuel pressure voltage at key-on after an eight-hour cold soak. The Powertrain Control Module (PCM) varies fuel pressure and monitors the final fueling and engine speed to determine if the rate of change of fueling with respect to the rate of change of pressure is within the normal operation limits of the pressure sensor. The engine must be at operating temperature and must not be in an active aftertreatment regeneration mode in order to run this diagnostic. The idle monitor runs once per drive cycle and the PCM will light the MIL lamp after the diagnostic runs and fails in two consecutive drive cycles. The PCM will turn off the MIL lamp after the diagnostic runs and passes in four consecutive drive cycles. The DTC will be set when at idle, the rate of change in fueling with respect to the rate of change of pressure is below the calibrated fail high threshold or above the calibrated fail low threshold while the monitor was running.

OBDII Code P0191 Dodge - Fuel Rail Pressure Sensor Circuit Range/Performance - AutoCodes.com — P0191 Dodge Code - Fuel Rail Pressure Sensor Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0191 Dodge?

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 Dodge?

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 Dodge 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.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0191 Dodge Code

1. What does the OBDII code P0191 mean on a Dodge vehicle?

P0191 indicates a problem with the Fuel Rail Pressure Sensor Circuit, specifically its range or performance, meaning the sensor is providing readings that are inconsistent or outside expected parameters.

2. What are the common symptoms of P0191 on a Dodge?

Symptoms include difficulty starting the engine, engine stalling, poor acceleration, reduced fuel efficiency, and the Check Engine Light being illuminated.

3. What causes the P0191 code to appear on a Dodge?

Common causes include a faulty fuel rail pressure sensor, damaged wiring or connectors, a failing fuel pump, clogged fuel filters, or low fuel pressure.

4. Can I drive my Dodge with the P0191 code?

Driving with P0191 is not recommended as it may lead to engine performance issues and potential damage to the fuel system if not addressed.

5. How do I diagnose the P0191 code on my Dodge?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the fuel rail pressure sensor and its wiring, testing fuel pressure, and checking for fuel pump or filter issues.

6. How do I fix the P0191 code on a Dodge?

Repairs may include replacing the fuel rail pressure sensor, repairing damaged wiring, cleaning or replacing the fuel filter, or replacing a failing fuel pump.

7. How much does it cost to fix the P0191 code on a Dodge?

Repair costs vary but typically range from $100 to $400 depending on whether the issue is with the sensor, wiring, or fuel system components.

8. Can a bad fuel pump cause the P0191 code on a Dodge?

Yes, a failing fuel pump can cause inconsistent fuel pressure readings, leading to the P0191 code.

9. Will replacing the fuel rail pressure sensor always fix the P0191 code?

No, while replacing the sensor often resolves the issue, other factors like wiring problems, fuel pump failure, or clogged filters could also be causing the code.

10. How can I prevent the P0191 code from reoccurring on my Dodge?

Regular maintenance, including replacing the fuel filter as recommended and ensuring the fuel system is clean and free of contaminants, can help prevent this code from reoccurring.