P0691 — Fan 1 Control Circuit Low

What Does P0691 Mean?

P0691 is a diagnostic trouble code indicating: Fan 1 Control Circuit Low. This code relates to the computer and output circuits system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P0691

⚠️ Check Engine Light (MIL) illuminated
⚠️ Fan 1 reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Multiple system malfunctions

Common Causes

🔍 Open or broken wire in Fan 1 circuit
🔍 Poor ground connection at Fan 1
🔍 Faulty Fan 1 with no output signal
🔍 Disconnected or loose Fan 1 connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P0691 mean?

P0691 indicates: Fan 1 Control Circuit Low. The vehicle's computer has detected that the Fan 1 is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P0691?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P0691 for extended periods may cause additional problems.

How much does it cost to fix P0691?

Repair costs for P0691 typically range from $20 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Repair broken wire or restore ground in Fan 1 circuit
🔧 Clean and secure Fan 1 connector and ground points
🔧 Replace failed Fan 1

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P0691: Fan 1 Control Circuit Low