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Engine-Codes – Saturn – P0685 Saturn

P0685 Saturn Code - Engine Control Module Power Relay Control Circuit Open

Quick Answer

The P0685 code for a Saturn vehicle indicates that there is an issue with the Engine Control Module (ECM) Power Relay Control Circuit being open. Common causes include Faulty power relay, Damaged wiring in the control circuit, Corrosion or poor connections in the electrical system. 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
P0685 Saturn indicates Engine Control Module Power Relay Control Circuit Open.
Common causes
Common causes include Faulty power relay, Damaged wiring in the control circuit, Corrosion or poor connections in the electrical system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P0685 Saturn Description

The P0685 code for a Saturn vehicle indicates that there is an issue with the Engine Control Module (ECM) Power Relay Control Circuit being open. The ECM is a crucial component in the vehicle's electronic system as it controls various functions such as fuel injection, ignition timing, and emissions control. The power relay control circuit is responsible for providing power to the ECM, allowing it to function properly.

OBDII Code P0685 Saturn - Engine Control Module Power Relay Control Circuit Open
P0685 Saturn Code - Engine Control Module Power Relay Control Circuit Open

Common Causes of P0685 Saturn

  1. Faulty power relay
  2. Damaged wiring in the control circuit
  3. Corrosion or poor connections in the electrical system
  4. ECM malfunction
  5. Overheating or electrical overload

Symptoms of P0685 Saturn

  1. Engine misfires or runs rough
  2. Difficulty starting the vehicle
  3. Loss of power or acceleration
  4. Check Engine Light illuminated
  5. Vehicle stalling or shutting off unexpectedly

How to Fix P0685 Saturn

  1. Begin by conducting a thorough inspection of the power relay and control circuit wiring to check for any visible damage or corrosion.
  2. Test the power relay using a multimeter to ensure it is functioning correctly. Replace if necessary.
  3. Check and repair any damaged wiring or connectors in the control circuit.
  4. Clear the diagnostic trouble codes and reset the ECM.
  5. Test drive the vehicle to confirm that the issue has been resolved and that the code does not return.

Cost to Fix P0685 Saturn

The cost of repairing a P0685 code on a Saturn vehicle can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for a power relay replacement or wiring repair can range from $50 to $200. Labor costs at an auto repair shop typically range from $80 to $150 per hour, with the total repair time varying based on the complexity of the issue. Overall, the total cost of addressing a P0685 code on a Saturn vehicle could range from $150 to $500 or more. It is recommended to obtain quotes from local auto repair shops to get a more accurate estimate based on your specific situation.

What does this mean?

Tech Notes for P0685 Saturn

Check all the Engine Control Module (ECM) fuses, if the fuses are OK, then replacing the ECM relay should take care of the problem.

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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 P0685 Saturn Code

1. What are the common symptoms associated with OBDII code P0685 in a Saturn?

The common symptoms of OBDII code P0685 in a Saturn include engine stalling, difficulty starting the engine, and illuminated Check Engine Light.

2. What does the OBDII code P0685 in a Saturn indicate?

OBDII code P0685 in a Saturn indicates a problem with the Engine Control Module Power Relay Control Circuit being open.

3. What are the possible causes of OBDII code P0685 in a Saturn?

Possible causes of OBDII code P0685 in a Saturn include a faulty engine control module power relay, damaged wiring or connectors in the relay circuit, or a malfunctioning engine control module.

4. How can I diagnose the OBDII code P0685 in my Saturn?

Diagnosing OBDII code P0685 in a Saturn involves checking the engine control module power relay for proper operation, inspecting the wiring and connectors for any damage, and testing the engine control module for functionality.

5. Can I drive my Saturn with OBDII code P0685?

It is not recommended to drive your Saturn with OBDII code P0685, as it can lead to engine stalling and other potential issues that may affect driving safety.

6. How can I repair OBDII code P0685 in my Saturn?

Repairing OBDII code P0685 in a Saturn typically involves replacing the faulty engine control module power relay, repairing any damaged wiring or connectors, or replacing the engine control module if necessary.

7. Is it possible to reset OBDII code P0685 in a Saturn without fixing the underlying issue?

Resetting OBDII code P0685 without addressing the underlying issue will only temporarily turn off the Check Engine Light. The code will likely reappear once the problem persists.

8. Are there any preventative measures to avoid OBDII code P0685 in a Saturn?

To prevent OBDII code P0685 in a Saturn, it is advisable to perform regular maintenance checks, such as inspecting the engine control module power relay and the related wiring for any signs of wear or damage.

9. How serious is OBDII code P0685 in a Saturn?

OBDII code P0685 in a Saturn is considered a serious issue as it can lead to engine performance problems, stalling, and potential safety hazards while driving.

10. Can a DIY enthusiast fix OBDII code P0685 in a Saturn?

A DIY enthusiast with experience in automotive repairs may be able to fix OBDII code P0685 in a Saturn by following proper diagnostic procedures and using the necessary tools. However, if unsure, it is recommended to seek professional assistance.

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