AutoCodes – Jeep – P0686 Jeep

P0686 Jeep 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 Jeep 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.

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Code Popularity 6,258

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

What does this mean?

What are the Possible Causes of the DTC P0686 Jeep?

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
Blown ECM fuse
Faulty ECM

How to Fix the DTC P0686 Jeep?

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 Jeep 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 Jeep code?

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

Need Help with the Code?

Get the P0686 Jeep 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 Jeep Code

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

- Common symptoms include engine misfires, stalling, rough idling, and difficulty starting the vehicle.

2. What can cause the OBDII code P0686 in a Jeep?

- The code P0686 is typically triggered by a faulty engine control module (ECM) power relay or issues with the relay control circuit.

3. How can I diagnose the cause of the OBDII code P0686 in my Jeep?

- To diagnose the issue, you can use a multimeter to test the ECM power relay and check the wiring and connections in the relay control circuit for any faults.

4. What are some repair tips for fixing the OBDII code P0686 in a Jeep?

- Repairing the code P0686 may involve replacing the ECM power relay, repairing any damaged wiring or connectors in the relay control circuit, or reprogramming the ECM.

5. Can driving with the OBDII code P0686 in a Jeep cause further damage to the vehicle?

- Continuing to drive with the code P0686 may lead to more severe engine performance issues and potential damage to other components, so it is recommended to address the problem promptly.

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

- The cost of repairing the code P0686 can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Is it safe to continue driving my Jeep with the OBDII code P0686?

- It is not recommended to drive the vehicle with the code P0686, as it can lead to further engine problems and potential safety hazards on the road.

8. Can a DIY enthusiast fix the OBDII code P0686 in a Jeep?

- If you have the necessary tools and knowledge, you may be able to diagnose and repair the code P0686 yourself, but it is advised to consult a professional if you are unsure.

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

- The repair time for the code P0686 can vary depending on the exact cause of the issue and the complexity of the repair, but it may take a few hours to a full day to complete.

10. Will resetting the OBDII code P0686 in my Jeep make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue is not fixed, the code is likely to reappear. It is important to diagnose and address the root cause of the problem for a permanent solution.