AutoCodes – Generic – P1187

P1187 Code - Fuel Pressure Monitoring - Regulator Valve Stick

Quick Answer

Fuel pressure monitoring is used to detect the troubles and the fuel leakage in high pressure system. Common causes include Faulty Fuel Pressure Regulator (FPR), Faulty Rail Pressure Sensor (RPS), Engine Control Module (ECM). 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: P1187 indicates Fuel Pressure Monitoring - Regulator Valve Stick.
Common causes: Common causes include Faulty Fuel Pressure Regulator (FPR), Faulty Rail Pressure Sensor (RPS), Engine Control Module (ECM).
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 46,139

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1187 Description

Fuel pressure monitoring is used to detect the troubles and the fuel leakage in high pressure system.
The Engine Control Module (ECM) determines the rail pressure value as a function of the engineâ€™s operating conditions and controls the fuel pressure regulator to ensure that the rail pressure reaches the required value.
Fuel pressure in the fuel line including the pumps and injector are continuously monitored during engine running.
If the rail pressure is excessive, the fuel pressure regulator opens and a portion of the fuel is returned from the rail to the fuel tank via a collector line. If the rail pressure is too low, the fuel pressure regulator closes.
The fuel pressure regulator closes. the fuel pressure regulator is installed in the tail end of high pressure accumulator.
In case of the insufficient fuel supply in the fuel line, the engine symptoms will occur a shut down and a starting impossible.
If the fuel pressure monitoring in engine fuel pressure line generates threshold value, the ECM judged this as a fault and the P1187 code is set.

OBDII Code P1187 - Fuel Pressure Monitoring - Regulator Valve Stick - AutoCodes.com — P1187 Code - Fuel Pressure Monitoring - Regulator Valve Stick

What does this mean?

What are the Possible Causes of the DTC P1187?

Faulty Fuel Pressure Regulator (FPR)
Faulty Rail Pressure Sensor (RPS)
Engine Control Module (ECM)

How to Fix the DTC P1187?

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 P1187 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 P1187 code?

Need more information on how to fix the P1187 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1187 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1187 Acura — Fuel Tank Temperature Sensor Circuit Low Voltage
P1187 Audi — Linear O2 Sensor Compensation Resistor Open Circuit
P1187 BMW — O2 Sensor Heater Control Circuit Bank 2 Sensor 2
P1187 Buick — Engine Oil Temperature Sensor Circuit Low Voltage
P1187 Cadillac — Engine Oil Temperature Sensor Circuit Low Voltage
P1187 Chevrolet — Engine Oil Temperature Sensor Circuit Low Voltage
P1187 Chrysler — Throttle Inlet Pressure/MAP Correlation
P1187 Dodge — Throttle Inlet Pressure/MAP Correlation
P1187 Ford — Variant Selection
P1187 GMC — Engine Oil Temperature Sensor Circuit Low Voltage
P1187 Honda — Fuel Tank Temperature Sensor Circuit Low Voltage
P1187 Hyundai — Fuel Pressure Monitoring - Regulator Valve Stick
P1187 Jeep — Throttle Inlet Pressure/MAP Correlation
P1187 KIA — Fuel Pressure Monitoring - Regulator Valve Stick
P1187 MINI — O2 Sensor Heater Control Circuit Bank 2 Sensor 2
P1187 Volkswagen — Linear O2 Sensor Compensation Resistor Open Circuit

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 P1187 Code

1. What does the OBDII code P1187 indicate?

Code P1187 indicates a problem with the fuel pressure monitoring, specifically pointing to an issue where the regulator valve is sticking.

2. What are common symptoms of code P1187?

Symptoms include a rough idle, decreased fuel efficiency, engine stalling, difficulty starting the engine, and a possible increase in exhaust emissions.

3. What can cause code P1187 to be triggered in a vehicle?

Possible causes for P1187 include a faulty fuel pressure regulator, clogged fuel filter, issues with the fuel pump, or problems with the fuel pressure sensor or its circuit.

4. How is the P1187 code diagnosed?

To diagnose the P1187 code, a technician will typically check the fuel pressure with a gauge, inspect the fuel pressure regulator and its connections, and examine the fuel pump and filter for faults. They may also use a scan tool to monitor live data and check the operation of the fuel pressure sensor.

5. What are some repair steps to fix the P1187 code?

Repairing the P1187 code may involve replacing the fuel pressure regulator, cleaning or replacing the fuel filter, repairing or replacing the fuel pump, or addressing any issues with the fuel pressure sensor or wiring.

6. Is it safe to drive with the P1187 code?

Driving with the P1187 code can lead to engine performance issues and potential stalling, making it unsafe in some situations. It is advisable to address the issue as soon as possible to avoid further complications.

7. Can a P1187 code affect fuel economy?

Yes, a sticking regulator valve can result in improper fuel pressure, which may decrease fuel efficiency and increase fuel consumption.

8. What tools are required to diagnose and repair a P1187 code?

Tools needed may include a fuel pressure gauge, a scan tool for reading fault codes and live data, basic hand tools, and possibly a multimeter for electrical testing.

9. How long does it take to fix the issue causing a P1187 code?

The time required to repair can vary based on the specific cause. Simple repairs like replacing a fuel filter or regulator might take a few hours, whereas more involved repairs such as replacing a fuel pump or extensive electrical diagnostics could take longer.

10. Are there any preventive measures to avoid the P1187 code?

Regular maintenance of the fuel system, including timely replacement of the fuel filter and inspection of the fuel pump and regulator, can help prevent issues associated with code P1187.