AutoCodes – Jeep – P0687 Jeep

P0687 Jeep Code - Engine Control Module Power Relay Control Circuit High

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: P0687 Jeep indicates Engine Control Module Power Relay Control Circuit High.
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 3,516

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 P0687 Jeep Description

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

OBDII Code P0687 Jeep - Engine Control Module Power Relay Control Circuit High - AutoCodes.com — P0687 Jeep Code - Engine Control Module Power Relay Control Circuit High

What does this mean?

What are the Possible Causes of the DTC P0687 Jeep?

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 P0687 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 P0687 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 P0687 Jeep code?

Need more information on how to fix the P0687 Jeep 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 P0687 Jeep Code

1. What does the OBDII code P0687 mean on a Jeep?

P0687 indicates a high voltage issue in the Engine Control Module (ECM) power relay control circuit, meaning the ECM isn't receiving or controlling power properly.

2. What are the common symptoms of code P0687 in a Jeep?

Symptoms may include the engine not starting, stalling while driving, reduced performance, or the Check Engine Light illuminated.

3. What causes the P0687 code to appear on a Jeep?

Common causes include a faulty ECM power relay, damaged wiring or connectors in the power relay circuit, blown fuses, or, in rare cases, a malfunctioning ECM.

4. Can a blown fuse trigger the P0687 code on a Jeep?

Yes, a blown fuse in the ECM power relay circuit can cause the P0687 code by interrupting the power supply.

5. How do I diagnose the P0687 code on my Jeep?

Start by inspecting the ECM power relay, related wiring, and fuses for damage or loose connections. Use a multimeter to test for proper voltage and continuity.

6. Is a faulty ECM common when dealing with the P0687 code on a Jeep?

A faulty ECM is a less common cause but should be considered if the relay and wiring are in good condition.

7. Can I drive my Jeep with the P0687 code?

It is not recommended to drive with this code, as it can lead to stalling or prevent the engine from starting, posing safety risks.

8. How do I fix the P0687 code on a Jeep?

Repairs may involve replacing a defective ECM power relay, repairing or replacing damaged wiring, or addressing issues with blown fuses.

9. How much does it cost to fix the P0687 code on a Jeep?

Repair costs vary depending on the issue but can range from $50 for a new relay to $500 or more if the ECM needs replacement.

10. Can a dead battery cause the P0687 code on a Jeep?

A weak or dead battery is unlikely to directly cause this code but could contribute to electrical system issues. Always check the battery when diagnosing electrical problems.