P0685 Lincoln Code - Powertrain Control Module Power Relay Control Circuit Open
Quick Answer
The P0685 diagnostic trouble code for a Lincoln indicates a problem with the Powertrain Control Module (PCM) Power Relay Control Circuit being open. Common causes include Faulty Power Relay: A defective power relay can cause the circuit to be open, preventing power from reaching the PCM, Wiring Issues: Damaged or corroded wiring connections can interrupt the electrical flow between the power relay and the PCM, PCM Failure: A malfunctioning PCM can also cause the circuit to be open, as it may not be receiving the necessary power. 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
- P0685 Lincoln indicates Powertrain Control Module Power Relay Control Circuit Open.
- Common causes
- Common causes include Faulty Power Relay: A defective power relay can cause the circuit to be open, preventing power from reaching the PCM, Wiring Issues: Damaged or corroded wiring connections can interrupt the electrical flow between the power relay and the PCM, PCM Failure: A malfunctioning PCM can also cause the circuit to be open, as it may not be receiving the necessary power.
- 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 P0685 Lincoln Description
The P0685 diagnostic trouble code for a Lincoln indicates a problem with the Powertrain Control Module (PCM) Power Relay Control Circuit being open. The PCM is a crucial component of the vehicle's engine management system, responsible for controlling various functions such as fuel injection, ignition timing, and emissions control. The power relay control circuit is responsible for supplying power to the PCM, allowing it to function properly.
Common Causes of P0685 Lincoln
- Faulty Power Relay: A defective power relay can cause the circuit to be open, preventing power from reaching the PCM.
- Wiring Issues: Damaged or corroded wiring connections can interrupt the electrical flow between the power relay and the PCM.
- PCM Failure: A malfunctioning PCM can also cause the circuit to be open, as it may not be receiving the necessary power.
- Loose Connections: Loose or poor connections between the power relay and the PCM can lead to an open circuit.
Symptoms of P0685 Lincoln
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Engine Stalling: The engine may stall or hesitate during acceleration, especially at higher speeds.
- Poor Fuel Economy: A decrease in fuel efficiency may be noticed due to the PCM not functioning optimally.
- Loss of Power: The vehicle may experience a loss of power or responsiveness when driving.
How to Fix P0685 Lincoln
- Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and pinpoint the exact cause of the open circuit.
- Inspect Wiring: Check all wiring connections between the power relay and the PCM for any signs of damage or corrosion.
- Test Power Relay: Test the power relay to ensure it is functioning correctly and replace it if necessary.
- Repair or Replace PCM: If the PCM is found to be faulty, it may need to be repaired or replaced to resolve the issue.
- Clear Codes: Once the repair is completed, clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P0685 Lincoln
The typical repair costs for addressing a P0685 code can vary depending on the specific cause of the issue. In general, the cost of replacing a faulty power relay or repairing wiring connections can range from $100 to $300. If the PCM needs to be replaced, the cost can increase significantly, ranging from $500 to $1000 or more. Additionally, labor costs can vary between $80 and $150 per hour, so the total repair cost can fluctuate based on the shop's hourly rate. It's recommended to consult with a qualified mechanic to get a more accurate estimate based on the specific circumstances of your vehicle.
Tech Notes for P0685 Lincoln
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Frequently Asked Questions about P0685 Lincoln Code
1. What are the common symptoms of OBDII code P0685 in a Lincoln vehicle?
The common symptoms of OBDII code P0685 in a Lincoln vehicle include engine stalling, difficulty starting the engine, and illuminated Check Engine Light.
2. What does the OBDII code P0685 indicate in a Lincoln vehicle?
OBDII code P0685 in a Lincoln vehicle indicates a fault in the Powertrain Control Module (PCM) Power Relay Control Circuit, specifically an open circuit.
3. What are the possible causes of OBDII code P0685 in a Lincoln vehicle?
Possible causes of OBDII code P0685 in a Lincoln vehicle include a faulty PCM power relay, damaged wiring or connectors in the relay control circuit, or a malfunctioning PCM.
4. How can I diagnose OBDII code P0685 in my Lincoln vehicle?
Diagnosing OBDII code P0685 in a Lincoln vehicle involves checking the PCM power relay, inspecting the wiring and connectors for damage, and testing the PCM for proper functionality using a diagnostic scanner.
5. How can I repair OBDII code P0685 in my Lincoln vehicle?
To repair OBDII code P0685 in a Lincoln vehicle, you may need to replace the faulty PCM power relay, repair any damaged wiring or connectors in the relay control circuit, or reprogram or replace the PCM if necessary.
6. Can OBDII code P0685 cause any serious damage to my Lincoln vehicle?
While OBDII code P0685 may not cause immediate serious damage, it can lead to engine performance issues and potential safety concerns if left unresolved. It's important to address the issue promptly.
7. Is it safe to continue driving my Lincoln vehicle with OBDII code P0685 present?
It is not recommended to continue driving your Lincoln vehicle with OBDII code P0685 present, as it can affect the engine's performance and potentially lead to further issues. It's best to address the problem as soon as possible.
8. Can a DIY enthusiast fix OBDII code P0685 in a Lincoln vehicle?
Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair OBDII code P0685 in a Lincoln vehicle. However, complex electrical issues may require professional assistance.
9. How long does it typically take to repair OBDII code P0685 in a Lincoln vehicle?
The time it takes to repair OBDII code P0685 in a Lincoln vehicle can vary depending on the exact cause of the issue and the availability of parts. It could range from a few hours to a day or more.
10. Are there any preventive measures to avoid OBDII code P0685 in a Lincoln vehicle?
Regular maintenance, such as inspecting and maintaining electrical components, checking for wiring integrity, and addressing any warning signs promptly, can help prevent OBDII code P0685 in a Lincoln vehicle.
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