AutoCodes – Generic – P0190

P0190 Code - Fuel Rail Pressure Sensor Circuit Malfunction

Quick Answer

The FRP sensor is a diaphragm strain gauge device. Common causes include Low or no fuel, Faulty Rail Pressure (FRP) Sensor, FRP 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: P0190 indicates Fuel Rail Pressure Sensor Circuit Malfunction.
Common causes: Common causes include Low or no fuel, Faulty Rail Pressure (FRP) Sensor, FRP 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 96,650

How popular is this code, among other codes? Medium

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 Apr 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0190 Description

The FRP sensor is a diaphragm strain gauge device. The FRP sensor measures the pressure difference between the fuel rail and atmospheric pressure. The FRP sensor nominal output varies between 0.5 and 4.5 volts, with 0.5 volts corresponding to 0 MPa (0 psi) gauge and 4.5 volts corresponding to 26 MPa (3771 psi) gauge. The sensor can read vacuums and may lower the output voltage to slightly below 0.5 volts. This condition is normal and is usually the case after several hours of cold soak before the vehicle dome light is turned on. The FP module is energized at the same time the dome light is commanded on. A disabled or malfunctioning dome light does not affect the FP module control.
The FRP sensor is located on the fuel rail, and provides a feedback signal to indicate the fuel rail pressure to the Powertrain Control Module (PCM). The PCM uses the FRP signal to command the correct injector timing and pulse width for correct fuel delivery at all speed and load conditions. The FRP sensor, along with the fuel volume regulator (part of the fuel injection pump), form a closed loop fuel pressure control system. An electrically faulted FRP sensor results in the deactivation of the fuel injection pump. Fuel pressure to injectors is then provided only by the FP module. When the fuel injection pump is de-energized and the injectors are active, the fuel rail pressure is approximately 70 kPa (10 psi) lower than FP module pressure due to the pressure drop across the fuel injection pump. Thus, if the FP module pressure is 448 kPa (65 psi), then the fuel rail pressure would be approximately 379 kPa (55 psi) if the injectors are active.

OBDII Code P0190 - Fuel Rail Pressure Sensor Circuit Malfunction - AutoCodes.com — P0190 Code - Fuel Rail Pressure Sensor Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0190?

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

How to Fix the DTC P0190?

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 P0190 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 P0190 code?

Need more information on how to fix the P0190 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P0190 Chevrolet — Fuel Rail Pressure Sensor Circuit Malfunction
P0190 Ford — Fuel Rail Pressure Sensor Circuit Malfunction
P0190 GMC — Fuel Rail Pressure Sensor Circuit Malfunction
P0190 Lexus — Fail Rail Pressure Sensor Circuit
P0190 Lincoln — Fuel Rail Pressure Sensor Circuit Malfunction
P0190 Mazda — Fuel Rail Pressure Sensor Circuit Malfunction
P0190 Mercedes-Benz — Fuel Rail Pressure Sensor Circuit Malfunction
P0190 Mercury — Fuel Rail Pressure Sensor Circuit Malfunction
P0190 Volkswagen — Fuel Rail Pressure Sensor Signal Circuit Fault

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 P0190 Code

No Frequently Asked Questions about P0190 Code found.

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Goldeni_99
Date: October 5, 2011 at 12:57 am

I have this problem with my 2004 Diesel Kia Sorento EX. How do I fix this problem?

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Zahin_12
Date: December 22, 2011 at 5:29 pm

I have peugeot expert 2004 and through diognostic the code is p0190 fuel pressure rail sensor circuit A, what does that mean?

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odie
Date: October 6, 2012 at 12:14 am

i had at the moment i asked the question replaced the pump and filter because of no fuel pressure checked with fuel gauge.also there was correct power at pump. car now running good. i simply wanted to know what all code 190 related to. you explained it to me well. thanks

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FORTUNATUSY EMILLIO KAGUO
Date: September 9, 2016 at 2:14 pm

I HAVE TOYOTA OPA D4 ENGINE PETROL,IT HAS THAT PROBLEM OF P0190,WHAT SHOULD I DO?

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