P0685 Hyundai 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 Hyundai 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 Hyundai Description
What are the Possible Causes of the DTC P0685 Hyundai?
- 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 Hyundai?
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 Hyundai 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 Hyundai Code
What does the OBDII code P0685 mean on a Hyundai?
1. The P0685 code indicates an issue with the Engine Control Module (ECM) Power Relay Control Circuit, specifically that it is open or not functioning properly. 2.
What are the common symptoms of code P0685 in a Hyundai?
Common symptoms include the engine not starting, poor performance, stalling, and the Check Engine Light being illuminated. 3.
What causes the P0685 code to appear on a Hyundai?
The most common causes are a faulty ECM power relay, damaged wiring, an open circuit, or a malfunctioning Engine Control Module. 4.
Can I drive my Hyundai with the P0685 code?
Driving with this code is not recommended, as it can cause the engine to stall unexpectedly or fail to start, potentially leaving you stranded. 5.
How do I diagnose the P0685 code on a Hyundai?
Diagnosis involves checking the ECM power relay, inspecting the wiring and connectors for damage, and testing the ECM power supply circuit with a multimeter. 6.
Can a blown fuse cause the P0685 code on a Hyundai?
Yes, a blown fuse in the ECM power circuit can interrupt the power relay and trigger the P0685 code. 7.
How is the P0685 code fixed on a Hyundai?
Repairs typically involve replacing the ECM power relay, repairing or replacing damaged wiring, or, in rare cases, replacing the ECM itself. 8.
What tools are needed to troubleshoot the P0685 code on a Hyundai?
Common tools include a multimeter, an OBDII scanner, and basic hand tools for inspecting and replacing components. 9.
How much does it cost to repair the P0685 code on a Hyundai?
Repair costs vary but typically range from $50 to $200 for replacing the ECM power relay and addressing wiring issues, depending on labor rates and parts. 10.
Can a weak battery cause the P0685 code on a Hyundai?
Yes, a weak or failing battery can lead to insufficient power to the ECM, potentially triggering the P0685 code.
Discuss the causes and fixes for P0685 Hyundai OBDII Code
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