AutoCodes – Mercury – P1243 Mercury

P1243 Mercury Code - Second Fuel Pump Faulty Or Ground Fault

Quick Answer

P1243 Mercury indicates Second Fuel Pump Faulty Or Ground Fault. Common causes include Faulty Second Fuel Pump, Second Fuel Pump harness is open or shorted, Second Fuel Pump 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: P1243 Mercury indicates Second Fuel Pump Faulty Or Ground Fault.
Common causes: Common causes include Faulty Second Fuel Pump, Second Fuel Pump harness is open or shorted, Second Fuel Pump 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 1,450

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 Jul 21, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1243 Mercury Description

OBDII Code P1243 Mercury - Second Fuel Pump Faulty Or Ground Fault - AutoCodes.com — P1243 Mercury Code - Second Fuel Pump Faulty Or Ground Fault

What does this mean?

What are the Possible Causes of the DTC P1243 Mercury?

Faulty Second Fuel Pump
Second Fuel Pump harness is open or shorted
Second Fuel Pump circuit poor electrical connection

How to Fix the DTC P1243 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 P1243 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.

Need more information about the P1243 Mercury code?

Need more information on how to fix the P1243 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1243 Mercury code diagnosed by a professional: Find a repair shop in your area

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 P1243 Mercury Code

1. What are the common symptoms of OBDII code P1243 in a Mercury related to a second fuel pump fault or ground fault?

- Common symptoms include engine misfires, poor fuel economy, difficulty starting the vehicle, and rough idling.

2. What are the potential causes of OBDII code P1243 indicating a second fuel pump fault or ground fault in a Mercury?

- Possible causes include a faulty second fuel pump, damaged wiring or connectors, a ground fault in the electrical system, or a malfunctioning fuel pump control module.

3. How can I diagnose the issue causing OBDII code P1243 in my Mercury indicating a second fuel pump fault or ground fault?

- Proper diagnosis involves inspecting the second fuel pump, checking the wiring and connectors for damage, testing the fuel pump control module, and verifying the ground connections.

4. What are the repair options for addressing OBDII code P1243 related to a second fuel pump fault or ground fault in a Mercury?

- Repairs may involve replacing the faulty second fuel pump, repairing damaged wiring or connectors, addressing the ground fault, or replacing the fuel pump control module if necessary.

5. Is it safe to continue driving my Mercury with OBDII code P1243 indicating a second fuel pump fault or ground fault?

- It is not recommended to continue driving the vehicle with this issue, as it can lead to further damage to the fuel system and potentially cause engine performance issues.

6. Can a DIY enthusiast fix OBDII code P1243 related to a second fuel pump fault or ground fault in a Mercury?

- While some simple diagnoses and repairs can be done by DIY enthusiasts, complex issues like a faulty pump or control module may require professional expertise.

7. How much can I expect to pay for repairs related to OBDII code P1243 in my Mercury due to a second fuel pump fault or ground fault?

- The cost of repairs can vary depending on the extent of the issue, but it's important to budget for potential expenses related to fuel pump replacement, wiring repairs, or module replacements.

8. Are there any preventive measures I can take to avoid encountering OBDII code P1243 in my Mercury related to a second fuel pump fault or ground fault?

- Regular maintenance, such as checking fuel system components and wiring for damage, can help prevent issues that may trigger this fault code.

9. How urgent is it to address OBDII code P1243 indicating a second fuel pump fault or ground fault in my Mercury?

- It is advisable to address the issue promptly to prevent further damage to the fuel system and ensure optimal engine performance and fuel efficiency.

10. What steps should I take if OBDII code P1243 reappears in my Mercury after repairs related to a second fuel pump fault or ground fault?

- If the fault code reappears, it is essential to recheck the repairs and conduct further diagnostics to identify any underlying issues that may not have been fully addressed.