P1931 Code - Fuel Additive Pump Control Circuit/Open
Quick Answer
The diagnostic trouble code P1931 indicates a problem with the fuel additive pump control circuit being open. Common causes include Faulty fuel additive pump, Broken or corroded wiring in the pump control circuit, Loose or disconnected electrical connectors. 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
- P1931 indicates Fuel Additive Pump Control Circuit/Open.
- Common causes
- Common causes include Faulty fuel additive pump, Broken or corroded wiring in the pump control circuit, Loose or disconnected electrical connectors.
- 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 P1931 Description
The diagnostic trouble code P1931 indicates a problem with the fuel additive pump control circuit being open. The fuel additive pump is responsible for injecting fuel additives into the fuel system to improve engine performance, emissions, and fuel efficiency. When the control circuit is open, it means that there is a break or interruption in the circuit, preventing the pump from functioning properly. This can lead to a lack of fuel additives being injected into the system, which can result in reduced engine performance, increased emissions, and decreased fuel efficiency. If not addressed, this issue can potentially lead to long-term damage to the engine and other fuel system components.
Common Causes of P1931
- Faulty fuel additive pump
- Broken or corroded wiring in the pump control circuit
- Loose or disconnected electrical connectors
- Faulty fuel additive pump control module
- Issues with the engine control module (ECM)
Symptoms of P1931
- Check engine light illuminated on the dashboard
- Decreased engine performance
- Poor fuel efficiency
- Rough idling or stalling
- Difficulty starting the vehicle
How to Fix P1931
- Perform a visual inspection of the fuel additive pump and control circuit to check for any visible damage or loose connections.
- Use a multimeter to test the continuity of the wiring in the control circuit to identify any breaks or interruptions.
- Test the fuel additive pump and control module for proper functionality and replace if necessary.
- Clear the diagnostic trouble codes from the vehicle's ECM and reset the system.
- Test drive the vehicle to ensure that the issue has been resolved and that the check engine light does not reappear.
Cost to Fix P1931
The typical repair costs for addressing a P1931 code can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the repair for this code may range from $200 to $500, including parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate based on your vehicle make and model.
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Code P1931 Information for Specific Makes
- P1931 Ford — Fuel Additive Pump Control Circuit/Open
- P1931 Lincoln — Fuel Additive Pump Control Circuit/Open
- P1931 Mazda — Fuel Additive Pump Control Circuit/Open
- P1931 Mercury — Fuel Additive Pump Control Circuit/Open
Frequently Asked Questions about P1931 Code
1. What are common symptoms of OBDII code P1931 (Fuel Additive Pump Control Circuit/Open)?
- Common symptoms include poor engine performance, rough idling, decreased fuel efficiency, and the illumination of the Check Engine Light.
2. What can cause OBDII code P1931 to trigger?
- Code P1931 is typically triggered by a malfunction in the fuel additive pump control circuit, such as a damaged wiring harness, faulty fuel pump relay, or a defective fuel additive pump.
3. How serious is OBDII code P1931 (Fuel Additive Pump Control Circuit/Open)?
- While the vehicle may still be operable with this code present, it is important to address it promptly to prevent potential damage to the fuel system and ensure optimal engine performance.
4. How can I diagnose the cause of OBDII code P1931?
- Diagnosing code P1931 often involves checking the wiring harness for any damage, testing the fuel pump relay for proper function, and inspecting the fuel additive pump for any defects.
5. What are some repair tips for addressing OBDII code P1931?
- Repair tips may include repairing or replacing damaged wiring, testing and replacing a faulty fuel pump relay, or replacing the fuel additive pump if it is found to be defective.
6. Can I drive my vehicle with OBDII code P1931 present?
- It is generally not recommended to drive the vehicle with this code present, as it can lead to decreased fuel efficiency and potential engine performance issues.
7. How much does it typically cost to repair OBDII code P1931?
- The cost of repairing code P1931 can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.
8. Is it possible to reset OBDII code P1931 without repairs?
- While clearing the code may temporarily turn off the Check Engine Light, the underlying issue causing code P1931 will still need to be addressed to prevent further problems.
9. Can a DIY enthusiast repair OBDII code P1931 at home?
- Depending on the cause of the code, DIY enthusiasts with automotive repair experience may be able to address code P1931 at home by following repair guides and using the necessary tools.
10. How long does it take to repair OBDII code P1931?
- The repair time for code P1931 can vary based on the specific cause and complexity of the repair, but it may take anywhere from 1 to 4 hours or more to complete the necessary repairs.
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