P0231 Mercury Code - Fuel Pump Secondary Circuit Low
Quick Answer
The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. Common causes include Blown Fuel Pump fuse, Open Fuel Pump Monitor Circuit, Faulty Fuel Pump Relay. 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
- P0231 Mercury indicates Fuel Pump Secondary Circuit Low.
- Common causes
- Common causes include Blown Fuel Pump fuse, Open Fuel Pump Monitor Circuit, Faulty Fuel Pump Relay.
- 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.
Code P0231 Mercury Description
What are the Possible Causes of the DTC P0231 Mercury?
- Blown Fuel Pump fuse
- Open Fuel Pump Monitor Circuit
- Faulty Fuel Pump Relay
- Damaged Engine Control Module (ECM)
How to Fix the DTC P0231 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.
Code Tech Notes
1. Disconnect the inertia switch harness connector
2. Turn key to ON position (Engine OFF)
3. Measure voltage of circuit between inertia switch harness connector and ground
4. If battery voltage is found, replaced Inertia Switch
5. Clear codes.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0231 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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Frequently Asked Questions about P0231 Mercury Code
1. What are the common symptoms of OBDII code P0231 in a Mercury related to the fuel pump secondary circuit?
- Common symptoms include engine stalling, no start condition, rough idling, and a lack of power while driving.
2. What are the typical causes of the OBDII code P0231 in a Mercury, indicating a low fuel pump secondary circuit?
- The typical causes include a faulty fuel pump, damaged wiring or connectors in the circuit, a blown fuse, or a problem with the fuel pump relay.
3. How can I diagnose the OBDII code P0231 in my Mercury indicating a low fuel pump secondary circuit?
- The diagnosis involves checking the fuel pump operation, inspecting the wiring and connectors for damage, testing the fuel pump relay, and ensuring proper fuse functionality.
4. What are some repair tips for addressing the OBDII code P0231 in a Mercury due to a low fuel pump secondary circuit?
- Repair tips include replacing a faulty fuel pump, repairing or replacing damaged wiring or connectors, checking and replacing the fuel pump relay if necessary, and resetting the trouble code after repairs.
5. Can a DIY enthusiast fix the OBDII code P0231 in a Mercury related to a low fuel pump secondary circuit?
- Depending on their skill level and access to tools, a DIY enthusiast may be able to diagnose and repair this issue, especially if it involves tasks like checking fuses, relays, and basic wiring connections.
6. How serious is the OBDII code P0231 indicating a low fuel pump secondary circuit in a Mercury?
- This code is serious as it directly affects the fuel delivery system, which can lead to engine performance issues, stalling, and potentially leaving you stranded if not addressed promptly.
7. Can driving with the OBDII code P0231 in a Mercury due to a low fuel pump secondary circuit cause further damage?
- Continuing to drive with this issue can potentially cause damage to the fuel pump or other components in the fuel delivery system, leading to more extensive and costly repairs.
8. Are there any preventive measures to avoid encountering the OBDII code P0231 related to a low fuel pump secondary circuit in a Mercury?
- Regular maintenance, such as inspecting and replacing the fuel pump as recommended by the manufacturer, can help prevent issues that might trigger this trouble code.
9. How much does it typically cost to repair the OBDII code P0231 in a Mercury caused by a low fuel pump secondary circuit?
- The cost of repair can vary depending on the exact cause of the issue, but it may involve expenses for parts like the fuel pump, wiring repairs, or replacements, and labor costs for the repair work.
10. Can resetting the OBDII code P0231 in a Mercury related to a low fuel pump secondary circuit solve the problem temporarily?
- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the low fuel pump secondary circuit problem. It's crucial to diagnose and address the root cause for a lasting solution.
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