P1187 Code - Fuel Pressure Monitoring - Regulator Valve Stick

Quick Answer

Diagnostic trouble code P1187 indicates a problem with the fuel pressure monitoring system, specifically related to the regulator valve sticking. Common causes include Contaminated fuel: The presence of debris or contaminants in the fuel system can cause the regulator valve to stick, Faulty fuel pressure regulator: A malfunctioning regulator valve itself can cause it to stick in one position, Carbon buildup: Carbon deposits in the fuel system can also lead to the regulator valve sticking. 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 Contaminated fuel: The presence of debris or contaminants in the fuel system can cause the regulator valve to stick, Faulty fuel pressure regulator: A malfunctioning regulator valve itself can cause it to stick in one position, Carbon buildup: Carbon deposits in the fuel system can also lead to the regulator valve sticking.

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.

• Description
• Common Causes
• Symptoms
• How To Fix
• Cost to Fix
• FAQs
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Common Causes of P1187

Symptoms of P1187

How to Fix P1187

Cost to Fix P1187

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Code P1187 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.