AutoCodes – Dodge – P0686 Dodge

P0686 Dodge Code - Engine Control Module Power Relay Control Circuit Low

Quick Answer

The Engine Control Module (ECM) monitors the power inputs. Common causes include Weak battery, Low voltage while cranking, Faulty Engine Control Module (ECM) power relay. 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: P0686 Dodge indicates Engine Control Module Power Relay Control Circuit Low.
Common causes: Common causes include Weak battery, Low voltage while cranking, Faulty Engine Control Module (ECM) power relay.
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 6,117

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
Cost to Diagnose
FAQs
Comments
Add Comment

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

Code P0686 Dodge Description

The Engine Control Module (ECM) monitors the power inputs. The ECM sets the OBDII code when the ECM detects a low power voltage input.

OBDII Code P0686 Dodge - Engine Control Module Power Relay Control Circuit Low - AutoCodes.com — P0686 Dodge Code - Engine Control Module Power Relay Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0686 Dodge?

Weak battery
Low voltage while cranking
Faulty Engine Control Module (ECM) power relay
ECM power relay harness is open or shorted
ECM power relay circuit poor electrical connection
Faulty ECM

How to Fix the DTC P0686 Dodge?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0686 Dodge 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 P0686 Dodge code?

Need more information on how to fix the P0686 Dodge code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0686 Dodge 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 P0686 Dodge Code

1. What are the common symptoms of OBDII code P0686 in a Dodge vehicle?

The common symptoms of OBDII code P0686 in a Dodge vehicle include engine stalling, difficulty starting the engine, and poor engine performance.

2. What causes the OBDII code P0686 in a Dodge vehicle?

The OBDII code P0686 in a Dodge vehicle is typically caused by a faulty engine control module (ECM) power relay or issues with the power relay control circuit.

3. How can I diagnose the OBDII code P0686 in my Dodge vehicle?

Diagnosing the OBDII code P0686 in a Dodge vehicle involves checking the engine control module power relay, inspecting the power relay control circuit for any damage or loose connections, and testing the relay's functionality.

4. Can a DIY enthusiast repair the OBDII code P0686 in a Dodge vehicle?

While some DIY enthusiasts may be able to replace the faulty engine control module power relay themselves, diagnosing and repairing issues related to the power relay control circuit may require professional automotive expertise.

5. Is it safe to continue driving my Dodge vehicle with the OBDII code P0686?

It is not recommended to continue driving your Dodge vehicle with the OBDII code P0686, as it can lead to further engine performance issues and potential stalling, which may compromise your safety on the road.

6. How much does it typically cost to repair the OBDII code P0686 in a Dodge vehicle?

The cost of repairing the OBDII code P0686 in a Dodge vehicle can vary depending on the extent of the issue, the specific model of the vehicle, and whether professional labor is required. It is advisable to consult a mechanic for an accurate estimate.

7. Can a weak battery cause the OBDII code P0686 in a Dodge vehicle?

Yes, a weak battery can potentially trigger the OBDII code P0686 in a Dodge vehicle, as inadequate power supply may affect the operation of the engine control module power relay.

8. Are there any preventive measures to avoid the OBDII code P0686 in my Dodge vehicle?

Regular maintenance, such as checking the battery's condition and ensuring proper electrical connections, can help prevent issues that may lead to the OBDII code P0686 in a Dodge vehicle.

9. How long does it take to repair the OBDII code P0686 in a Dodge vehicle?

The repair time for the OBDII code P0686 in a Dodge vehicle can vary depending on the specific issue and the availability of parts. It is advisable to consult a mechanic for a more accurate timeframe.

10. Can a reset of the vehicle's ECM clear the OBDII code P0686 in a Dodge vehicle?

While resetting the vehicle's ECM may temporarily clear the OBDII code P0686, it is important to address the underlying issue with the engine control module power relay or power relay control circuit to prevent the code from reappearing.