AutoCodes – Generic – P1243

P1243 Code - Second Fuel Pump Faulty Or Ground Fault

Quick Answer

P1243 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 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 21,527

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 Description

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

What does this mean?

What are the Possible Causes of the DTC P1243?

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?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

P1243 Acura — Throttle Position Insufficient
P1243 Audi — Injector Circuit Open Cylinder 7
P1243 Buick — Injector Circuit Cylinder 8 Intermittent
P1243 Cadillac — Injector Circuit Cylinder 8 Intermittent
P1243 Chevrolet — Injector Circuit Cylinder 8 Intermittent
P1243 Ford — Second Fuel Pump Faulty or Ground Fault
P1243 GMC — Injector Circuit Cylinder 8 Intermittent
P1243 Honda — Throttle Position Insufficient
P1243 Lincoln — Second Fuel Pump Faulty Or Ground Fault
P1243 Mercury — Second Fuel Pump Faulty Or Ground Fault
P1243 Mitsubishi — Inquiry/Response Error
P1243 Nissan — Supercharger Bypass Valve Circuit Malfunction
P1243 Volkswagen — Injector Circuit Open Cylinder 7

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 Code

1. What are the common symptoms of OBDII code P1243 (Second Fuel Pump Faulty Or Ground Fault)?

- Common symptoms include poor engine performance, difficulty starting the vehicle, and a noticeable decrease in fuel efficiency.

2. What are the possible causes of OBDII code P1243?

- The code P1243 can be triggered by a faulty secondary fuel pump, a ground fault in the fuel pump circuit, or damaged wiring/connectors related to the fuel pump.

3. How can I diagnose the issue related to OBDII code P1243?

- To diagnose the problem, you can use a scan tool to read the code, inspect the secondary fuel pump and its connections, and test the fuel pump circuit for any grounding issues.

4. Can I continue driving my vehicle with OBDII code P1243 present?

- It is not recommended to drive the vehicle with code P1243 active, as it can lead to further damage to the fuel system and potentially cause engine performance issues.

5. How can I repair OBDII code P1243 (Second Fuel Pump Faulty Or Ground Fault)?

- Repairing the issue involves replacing the faulty secondary fuel pump, repairing any ground faults in the circuit, and ensuring all wiring and connectors are in good condition.

6. Are there any specific precautions to take when working on the fuel pump related to OBDII code P1243?

- When working on the fuel pump, it is important to relieve the fuel system pressure first, disconnect the battery, and handle fuel components with care to prevent accidents or injuries.

7. Can a DIY enthusiast fix OBDII code P1243 at home?

- While some DIY enthusiasts may have the skills to diagnose and repair the issue related to code P1243, it is recommended to seek professional help, especially when dealing with fuel system components.

8. Will resetting the OBDII code P1243 make it go away permanently?

- Simply resetting the code may temporarily clear the error, but if the underlying issue with the secondary fuel pump or ground fault is not addressed, the code is likely to reappear.

9. Is OBDII code P1243 a common issue in specific vehicle makes or models?

- The code P1243 can occur in various vehicle makes and models that are equipped with OBDII systems and secondary fuel pumps, but it may be more prevalent in certain vehicles known for fuel system issues.

10. What should I do if I have replaced the secondary fuel pump but OBDII code P1243 persists?

- If the code persists after replacing the secondary fuel pump, it is recommended to recheck the connections, inspect the wiring for damage, and verify that the fuel pump circuit is functioning correctly.