AutoCodes – Lincoln – P0685 Lincoln

P0685 Lincoln Code - Powertrain Control Module Power Relay Control Circuit Open

Quick Answer

This DTC sets when the ignition switch position run circuit indicates the ignition is in the OFF, ACC, or LOCK position, and the amount of time the Powertrain Control Module (PCM) remains powered through the PCM power relay exceeds a predetermined amount of time. Common causes include Faulty Powertrain Control Module (PCM) Power Relay, PCM Power Relay harness is open or shorted, PCM 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 Lincoln indicates Powertrain Control Module Power Relay Control Circuit Open.
Common causes: Common causes include Faulty Powertrain Control Module (PCM) Power Relay, PCM Power Relay harness is open or shorted, PCM 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 1,935

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 Lincoln Description

OBDII Code P0685 Lincoln - Powertrain Control Module Power Relay Control Circuit Open - AutoCodes.com — P0685 Lincoln Code - Powertrain Control Module Power Relay Control Circuit Open

What does this mean?

What are the Possible Causes of the DTC P0685 Lincoln?

Faulty Powertrain Control Module (PCM) Power Relay
PCM Power Relay harness is open or shorted
PCM Power Relay circuit poor electrical connection
Blown PCM fuse
Faulty PCM

How to Fix the DTC P0685 Lincoln?

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 Lincoln 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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Get the P0685 Lincoln 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 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.