P1243 Code - Second Fuel Pump Faulty Or Ground Fault
Quick Answer
The diagnostic trouble code P1243 indicates that there is a fault with the second fuel pump or a ground fault related to it. Common causes include Failed second fuel pump, Ground fault in the fuel pump circuit, Wiring issues or corrosion. 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 Failed second fuel pump, Ground fault in the fuel pump circuit, Wiring issues or corrosion.
- 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 P1243 Description
The diagnostic trouble code P1243 indicates that there is a fault with the second fuel pump or a ground fault related to it. In vehicles with dual fuel pumps, this code specifically points to an issue with the secondary pump. The fuel pump is responsible for delivering fuel from the tank to the engine, ensuring proper fuel pressure and flow for combustion. A faulty second fuel pump or a ground fault can disrupt this process, leading to various performance issues and potentially causing long-term damage to the vehicle.
Common Causes of P1243
- Failed second fuel pump
- Ground fault in the fuel pump circuit
- Wiring issues or corrosion
- Malfunctioning fuel pump control module
- Electrical problems in the fuel system
Symptoms of P1243
- Poor engine performance
- Stalling or difficulty starting
- Rough idling or surging while driving
- Check Engine light illuminated
- Reduced fuel economy
How to Fix P1243
- Diagnose the issue with a scan tool to confirm the P1243 code and pinpoint the exact cause of the problem.
- Inspect the second fuel pump, wiring, and connections for any signs of damage, corrosion, or wear.
- Test the fuel pump control module and related components to ensure proper functionality.
- Replace the faulty second fuel pump, repair any wiring issues, or address the ground fault as needed.
- Clear the trouble code, reset the vehicle's computer, and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P1243
The cost of repairing a second fuel pump fault or ground fault related to the fuel pump can vary depending on the extent of the problem, the vehicle make and model, and the labor rates in your area. On average, the repair costs for this issue can range from $200 to $800, including parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. For a more accurate estimate, it's recommended to consult a local mechanic or dealership.
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Code P1243 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
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.
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