AutoCodes – Lincoln – P0688 Lincoln

P0688 Lincoln Code - Electronic Control Module Power Relay Sense Circuit/Open

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: P0688 Lincoln indicates Electronic Control Module Power Relay Sense Circuit/Open.
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 1,391

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 P0688 Lincoln Description

The Engine Control Module (ECM) monitors the power inputs. The ECM sets the OBDII code when the ECM remains powered up after the ignition switch has been turned OFF.

OBDII Code P0688 Lincoln - Electronic Control Module Power Relay Sense Circuit/Open - AutoCodes.com — P0688 Lincoln Code - Electronic Control Module Power Relay Sense Circuit/Open

What does this mean?

What are the Possible Causes of the DTC P0688 Lincoln?

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 P0688 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0688 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.

Need more information about the P0688 Lincoln code?

Need more information on how to fix the P0688 Lincoln code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0688 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 P0688 Lincoln Code

1. What are the common symptoms of OBDII code P0688 in a Lincoln?

Common symptoms of code P0688 in a Lincoln may include engine stalling, difficulty starting the vehicle, and the illumination of the check engine light.

2. What does the OBDII code P0688 in a Lincoln indicate?

Code P0688 indicates a malfunction in the Electronic Control Module (ECM) power relay sense circuit, specifically an open circuit.

3. What are the possible causes of OBDII code P0688 in a Lincoln?

Possible causes of code P0688 in a Lincoln include a faulty ECM power relay, damaged wiring or connectors in the power relay circuit, or a malfunctioning ECM.

4. How can I diagnose the cause of OBDII code P0688 in my Lincoln?

To diagnose code P0688, you can use a diagnostic scanner to retrieve the code and then inspect the power relay, wiring, and connectors associated with the ECM power relay sense circuit for any visible damage.

5. Can I drive my Lincoln with OBDII code P0688?

It is not recommended to drive your Lincoln with an active P0688 code, as it can lead to engine stalling and other potential safety hazards. It is best to address the issue promptly.

6. How can I repair OBDII code P0688 in my Lincoln?

Repairing code P0688 may involve replacing the ECM power relay if it is faulty, repairing any damaged wiring or connectors in the circuit, or replacing the ECM itself if necessary.

7. Will resetting the OBDII code P0688 in my Lincoln make it go away permanently?

Simply resetting the code may temporarily turn off the check engine light, but if the underlying issue causing code P0688 is not addressed, the code is likely to return.

8. Can a DIY enthusiast fix OBDII code P0688 in a Lincoln?

Depending on the root cause of the code, a DIY enthusiast with the necessary tools and knowledge may be able to replace the ECM power relay or repair wiring issues. However, more complex repairs may require professional assistance.

9. How much does it cost to repair OBDII code P0688 in a Lincoln?

The cost of repairing code P0688 in a Lincoln can vary depending on the specific cause of the issue and whether professional help is needed. Costs may include parts and labor.

10. Is it important to address OBDII code P0688 promptly in my Lincoln?

Yes, it is important to address code P0688 promptly to prevent potential engine stalling and other issues that can arise from a malfunction in the ECM power relay sense circuit.