AutoCodes – Mercury – P025B Mercury

P025B Mercury Code - Fuel Pump Module Control Circuit Range/Performance

Quick Answer

The fuel pump control module monitors the duty cycle and frequency of the signal it receives from the Powertrain Control Module (PCM). Common causes include Faulty Fuel Pump Command (FPC), FPC Harness is open or shorted, FPC circuit poor electrical connection. 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: P025B Mercury indicates Fuel Pump Module Control Circuit Range/Performance.
Common causes: Common causes include Faulty Fuel Pump Command (FPC), FPC Harness is open or shorted, FPC circuit poor electrical connection.
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 1,113

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 May 17, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P025B Mercury Description

The fuel pump control module monitors the duty cycle and frequency of the signal it receives from the Powertrain Control Module (PCM). The fuel pump control module determines if the signal from the PCM on the Fuel Pump Command (FPC) circuit is a valid duty cycle and frequency. If the duty cycle or frequency is invalid, the fuel pump control module sends a 20% duty cycle signal on the fuel pump monitor (FPM) circuit to report the concern to the PCM. The test fails when the fuel pump control module is still reporting that it is receiving an invalid duty cycle or frequency from the PCM after a calibrated amount of time.

OBDII Code P025B Mercury - Fuel Pump Module Control Circuit Range/Performance - AutoCodes.com — P025B Mercury Code - Fuel Pump Module Control Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P025B Mercury?

Faulty Fuel Pump Command (FPC)
FPC Harness is open or shorted
FPC circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P025B Mercury?

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 P025B Mercury 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 P025B Mercury Code

1. What are the common symptoms of OBDII code P025B in a Mercury vehicle?

- Common symptoms include engine stalling, rough idling, poor acceleration, and difficulty starting the vehicle.

2. What does the OBDII code P025B Fuel Pump Module Control Circuit Range/Performance indicate in a Mercury?

- This code indicates a potential issue with the fuel pump module control circuit, affecting the fuel delivery system.

3. What are the possible causes of OBDII code P025B in a Mercury?

- Possible causes include a faulty fuel pump module, damaged wiring or connectors, a weak fuel pump relay, or a problem with the powertrain control module (PCM).

4. How can I diagnose the OBDII code P025B in my Mercury?

- Diagnosing this code typically involves testing the fuel pump module, checking the wiring and connectors for damage, inspecting the fuel pump relay, and scanning the PCM for any related trouble codes.

5. Can I still drive my Mercury with the OBDII code P025B present?

- It is not recommended to drive the vehicle with this code present, as it can lead to engine performance issues and potential stalling, posing a safety risk.

6. How can I repair OBDII code P025B in my Mercury?

- Repair options may include replacing the fuel pump module, repairing or replacing damaged wiring/connectors, testing and replacing the fuel pump relay, and reprogramming or replacing the PCM if necessary.

7. Is it possible to reset the OBDII code P025B in a Mercury without fixing the underlying issue?

- It is possible to clear the code temporarily, but it will likely reappear if the root cause of the problem is not addressed.

8. Are there any preventive maintenance steps to avoid OBDII code P025B in a Mercury?

- Regularly inspecting the fuel system components, maintaining the fuel pump module, and addressing any fuel delivery issues promptly can help prevent this code from occurring.

9. Can a DIY enthusiast fix OBDII code P025B in a Mercury, or is professional help recommended?

- Depending on the skill level and experience of the DIY enthusiast, it may be possible to address this code with the proper tools and knowledge. However, professional help is recommended for complex diagnosis and repairs.

10. How long does it typically take to repair OBDII code P025B in a Mercury?

- The repair time can vary based on the exact cause of the issue and the complexity of the repair process. It may range from a few hours to a full day, depending on the circumstances.