AutoCodes – Subaru – P0691 Subaru

P0691 Subaru Code - Cooling Fan 1 Control Circuit Low

Quick Answer

The Engine Control Module (ECM) monitors the Cooling Fan 1 Control Circuit. Common causes include Faulty Fan 1 Relay, Fan 1 Relay harness is open or shorted, Fan 1 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: P0691 Subaru indicates Cooling Fan 1 Control Circuit Low.
Common causes: Common causes include Faulty Fan 1 Relay, Fan 1 Relay harness is open or shorted, Fan 1 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 23,034

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 P0691 Subaru Description

The Engine Control Module (ECM) monitors the Cooling Fan 1 Control Circuit. The ECM sets the OBDII code when the Cooling Fan 1 Control Circuit is not to the factory specifications.

OBDII Code P0691 Subaru - Cooling Fan 1 Control Circuit Low - AutoCodes.com — P0691 Subaru Code - Cooling Fan 1 Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0691 Subaru?

Faulty Fan 1 Relay
Fan 1 Relay harness is open or shorted
Fan 1 Relay circuit poor electrical connection
Faulty Fan 1
Fan 1 harness is open or shorted
Fan 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0691 Subaru?

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 P0691 Subaru 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 P0691 Subaru code?

Need more information on how to fix the P0691 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0691 Subaru 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 P0691 Subaru Code

1. What are the common symptoms of OBDII code P0691 in a Subaru related to Cooling Fan 1 Control Circuit Low?

The common symptoms include the cooling fan not operating at the correct speed, engine overheating, and the Check Engine Light illuminating.

2. What could cause the OBDII code P0691 in a Subaru indicating Cooling Fan 1 Control Circuit Low?

Possible causes include a faulty cooling fan relay, wiring issues, a malfunctioning cooling fan motor, or a problem with the engine control module (ECM).

3. How can I diagnose the OBDII code P0691 in my Subaru for Cooling Fan 1 Control Circuit Low?

You can diagnose the issue by checking the cooling fan relay, inspecting the wiring for any damage, testing the cooling fan motor, and verifying the ECM functionality using a diagnostic tool.

4. What are the potential risks of ignoring the OBDII code P0691 related to Cooling Fan 1 Control Circuit Low in a Subaru?

Ignoring this code can lead to engine overheating, which can cause severe damage to the engine components and result in costly repairs.

5. Can I continue driving my Subaru with the OBDII code P0691 indicating Cooling Fan 1 Control Circuit Low?

It is not recommended to drive your Subaru with this code, as it can lead to overheating issues and potential engine damage. It's best to address the problem promptly.

6. How can I repair the OBDII code P0691 in my Subaru for Cooling Fan 1 Control Circuit Low?

The repair may involve replacing the cooling fan relay, repairing any damaged wiring, fixing or replacing the cooling fan motor, or reprogramming the ECM if necessary.

7. Is it possible to reset the OBDII code P0691 related to Cooling Fan 1 Control Circuit Low in a Subaru without fixing the underlying issue?

While you can clear the code with a diagnostic tool, it will likely reappear until the root cause of the problem is addressed.

8. What are some preventive maintenance tips to avoid encountering the OBDII code P0691 in a Subaru for Cooling Fan 1 Control Circuit Low?

Regularly inspecting the cooling system components, replacing worn-out parts promptly, and ensuring proper cooling system maintenance can help prevent this issue.

9. Can a DIY enthusiast fix the OBDII code P0691 related to Cooling Fan 1 Control Circuit Low in a Subaru?

Depending on your experience and tools available, you may be able to diagnose and address simple causes like a faulty relay or damaged wiring. However, more complex issues may require professional assistance.

10. How long does it typically take to repair the OBDII code P0691 in a Subaru indicating Cooling Fan 1 Control Circuit Low?

The repair time can vary based on the exact cause of the issue and your expertise. Simple fixes like replacing a relay can be done quickly, while more complex problems may take longer and require professional help.