P0685 Mitsubishi Code - Engine Control Module Power Relay Control Circuit Open
Quick Answer
The Engine Control Module (ECM) monitors the power inputs. Common causes include Faulty Engine Control Module (ECM) power relay, ECM power relay harness is open or shorted, ECM power relay 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
- P0685 Mitsubishi indicates Engine Control Module Power Relay Control Circuit Open.
- Common causes
- Common causes include Faulty Engine Control Module (ECM) power relay, ECM power relay harness is open or shorted, ECM power relay 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.
Code P0685 Mitsubishi Description
What are the Possible Causes of the DTC P0685 Mitsubishi?
- Faulty Engine Control Module (ECM) power relay
- ECM power relay harness is open or shorted
- ECM power relay circuit poor electrical connection
- Blown ECM fuse
- Faulty ECM
How to Fix the DTC P0685 Mitsubishi?
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
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0685 Mitsubishi 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 P0685 Mitsubishi Code
1. What does the OBDII code P0685 mean for a Mitsubishi vehicle?
The P0685 code indicates an open circuit in the Engine Control Module (ECM) power relay control, meaning the ECM is not receiving the necessary power to function properly.
2. What are common symptoms of the P0685 code in a Mitsubishi?
Symptoms may include difficulty starting the engine, engine stalling, poor performance, or the inability to start the vehicle altogether.
3. What causes the P0685 code in Mitsubishi vehicles?
Common causes include a faulty ECM power relay, damaged wiring or connectors in the relay circuit, or a malfunctioning ECM.
4. How can I diagnose the P0685 code in my Mitsubishi?
Start by inspecting the ECM power relay, wiring, and connectors for damage. Use a multimeter to check continuity in the circuit and test the relay for proper operation.
5. Can a bad battery cause the P0685 code on my Mitsubishi?
A weak or failing battery can contribute to electrical issues, including this code, if it affects the ECM power relay operation or circuit continuity.
6. How do I fix the P0685 code on my Mitsubishi?
Repairs may include replacing the ECM power relay, repairing or replacing damaged wiring or connectors, or, in rare cases, replacing the ECM itself.
7. Is it safe to drive my Mitsubishi with the P0685 code?
Driving with this code is not recommended, as it can lead to stalling or complete engine failure, which may leave you stranded.
8. How much does it cost to repair the P0685 code on a Mitsubishi?
Repair costs can vary, but replacing an ECM power relay typically costs $20-$60, while wiring repairs or ECM replacement can be significantly higher.
9. Can I clear the P0685 code without repairing the issue?
Clearing the code without addressing the underlying problem may result in the code returning and continued performance issues.
10. Does the P0685 code always require ECM replacement?
No, ECM replacement is rarely necessary. Most cases involve fixing wiring issues or replacing the ECM power relay.
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