AutoCodes – MINI – P0686 MINI

P0686 MINI 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 MINI 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 3,240

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

What does this mean?

What are the Possible Causes of the DTC P0686 MINI?

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 MINI?

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 MINI 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 MINI code?

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

Need Help with the Code?

Get the P0686 MINI 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 MINI Code

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

The common symptoms of OBDII code P0686 in a MINI include engine stalling, rough idle, difficulty starting the engine, and illuminated check engine light.

2. What does OBDII code P0686 indicate in a MINI?

OBDII code P0686 in a MINI indicates a problem with the Engine Control Module Power Relay Control Circuit being low, which can affect the power supply to the ECM.

3. What are the possible causes of OBDII code P0686 in a MINI?

Possible causes of OBDII code P0686 in a MINI include a faulty power relay, damaged wiring or connectors in the power relay circuit, a defective Engine Control Module (ECM), or a weak battery.

4. How can I diagnose OBDII code P0686 in my MINI?

To diagnose OBDII code P0686 in your MINI, you can use an OBDII scanner to retrieve the trouble code and check the power relay, wiring, connectors, and battery for any signs of damage or malfunction.

5. Is it safe to continue driving with OBDII code P0686 in my MINI?

It is not recommended to continue driving with OBDII code P0686 in your MINI as it can lead to further engine performance issues and potential damage to the ECM. It is best to address the issue promptly.

6. Can I repair OBDII code P0686 in my MINI myself?

While some DIY enthusiasts may attempt to repair OBDII code P0686 in their MINI by replacing the power relay or fixing wiring issues, it is recommended to seek professional help for accurate diagnosis and repair.

7. How much does it cost to fix OBDII code P0686 in a MINI?

The cost to fix OBDII code P0686 in a MINI can vary depending on the root cause of the issue, parts needed for repair, and labor costs. It is advisable to obtain quotes from reputable mechanics or service centers.

8. Will resetting the error code make OBDII code P0686 go away in my MINI?

Resetting the error code may temporarily clear OBDII code P0686, but if the underlying issue such as a faulty power relay or ECM problem is not addressed, the code is likely to reappear.

9. Can a weak battery trigger OBDII code P0686 in a MINI?

Yes, a weak or failing battery can potentially trigger OBDII code P0686 in a MINI as it can impact the power supply to the ECM and cause voltage irregularities in the power relay circuit.

10. How important is it to address OBDII code P0686 promptly in my MINI?

It is crucial to address OBDII code P0686 promptly in your MINI to prevent potential engine performance issues, stalling, or further damage to the ECM. Ignoring the code can lead to more extensive and costly repairs down the line.