AutoCodes – Honda – P0685 2008 Honda Accord

P0685 2008 Honda Accord 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 2008 Honda Accord 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.

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Code Popularity 12,533

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
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Code P0685 2008 Honda Accord 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 2008 Honda Accord - Engine Control Module Power Relay Control Circuit Open - AutoCodes.com — P0685 2008 Honda Accord Code - Engine Control Module Power Relay Control Circuit Open

What does this mean?

What are the Possible Causes of the DTC P0685 2008 Honda Accord?

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 2008 Honda Accord?

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 2008 Honda Accord 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 2008 Honda Accord code?

Need more information on how to fix the P0685 2008 Honda Accord code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 2008 Honda Accord Code

1. What are the common symptoms of OBDII code P0685 in a 2008 Honda Accord?

- Common symptoms include engine stalling, difficulty starting the vehicle, and the illumination of the Check Engine light.

2. What causes the Engine Control Module Power Relay Control Circuit Open code (P0685) in a 2008 Honda Accord?

- The code P0685 is typically caused by a faulty engine control module power relay or issues with the wiring in the control circuit.

3. How can I diagnose the OBDII code P0685 on my 2008 Honda Accord?

- To diagnose the code P0685, you can use a diagnostic scanner to read the trouble codes, then inspect the engine control module power relay and related wiring for any visible damage.

4. Can I drive my 2008 Honda Accord with the P0685 code present?

- It is not recommended to drive your vehicle with the P0685 code active, as it can lead to potential engine performance issues and further damage if left unresolved.

5. How can I repair the Engine Control Module Power Relay Control Circuit Open code in my 2008 Honda Accord?

- The repair typically involves replacing the faulty engine control module power relay and addressing any wiring issues in the control circuit.

6. Is it possible to reset the P0685 code in a 2008 Honda Accord without making any repairs?

- While you can clear the code using a diagnostic scanner, it is crucial to address the underlying issue causing the code to prevent further problems.

7. Can a DIY enthusiast fix the P0685 code in a 2008 Honda Accord?

- Depending on your expertise, you may be able to replace the engine control module power relay yourself, but if you are unsure, it is best to consult a professional mechanic.

8. How much does it cost to repair the P0685 code in a 2008 Honda Accord at a dealership?

- The cost of repairing the P0685 code at a dealership can vary but typically includes the cost of parts, labor, and any diagnostic fees.

9. Will the P0685 code in a 2008 Honda Accord affect fuel efficiency?

- Yes, the P0685 code can potentially affect fuel efficiency due to engine performance issues caused by the faulty engine control module power relay.

10. How long does it take to repair the P0685 code in a 2008 Honda Accord?

- The repair time for the P0685 code can vary depending on the extent of the issue, but it typically takes a few hours to replace the engine control module power relay and address wiring problems.