AutoCodes – KIA – P0685 KIA

P0685 KIA 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 KIA 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 23,607

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 05, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0685 KIA Description

The Engine Control Module (ECM) monitors the power inputs. The ECM sets the OBDII code when the ECM remains powered up after the ignition switch has been turned OFF.

OBDII Code P0685 KIA - Engine Control Module Power Relay Control Circuit Open - AutoCodes.com — P0685 KIA Code - Engine Control Module Power Relay Control Circuit Open

What does this mean?

What are the Possible Causes of the DTC P0685 KIA?

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 KIA?

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.

What does this mean?

Code Tech Notes

Check all the Engine Control Module (ECM) fuses, if the fuses are OK, then replacing the ECM relay should take care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0685 KIA 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.

Need more information about the P0685 KIA code?

Need more information on how to fix the P0685 KIA code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0685 KIA code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0685 KIA Code

What does the OBDII code P0685 mean on a Kia?

1. P0685 indicates an issue with the Engine Control Module (ECM) Power Relay Control Circuit, meaning the ECM may not be receiving power due to an open circuit. 2.

What are the common symptoms of the P0685 code on a Kia?

Symptoms include engine stalling, failure to start, rough idling, reduced power, or the Check Engine Light illuminating. 3.

What causes the P0685 code to appear on a Kia?

Common causes include a faulty ECM power relay, damaged wiring or connectors in the relay circuit, a blown fuse, or a malfunctioning ECM. 4.

Can I drive my Kia with the P0685 code active?

Driving with this code is not recommended as it may lead to engine stalling or failure to start, potentially leaving you stranded. 5.

How do I diagnose the P0685 code on a Kia?

Diagnosis involves checking the ECM power relay, inspecting the wiring and connectors for damage, testing the relay circuit for continuity, and verifying ECM functionality. 6.

Can a weak battery cause the P0685 code on a Kia?

Yes, a weak or failing battery can cause insufficient power to the ECM relay circuit, triggering the P0685 code. 7.

What repairs are typically needed to fix the P0685 code on a Kia?

Repairs may include replacing the ECM power relay, repairing or replacing damaged wiring or connectors, or replacing the ECM if it is faulty. 8.

How much does it cost to fix the P0685 code on a Kia?

Repair costs can vary, with a new ECM power relay costing $20-$50, while wiring repair or ECM replacement can range from $100 to over $1,000, depending on labor and parts. 9.

Can a blown fuse cause the P0685 code on a Kia?

Yes, a blown fuse in the ECM power relay circuit can disrupt power flow and trigger the P0685 code. 10.

How can I prevent the P0685 code from recurring on my Kia?

Regular maintenance, inspecting the electrical system for damage, and addressing battery or relay issues promptly can help prevent this code from recurring.