C0604 — Active Air Dam Control Circuit Performance

What Does C0604 Mean?

C0604 is a diagnostic trouble code indicating: Active Air Dam Control Circuit Performance. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C0604

⚠️ Check Engine Light (MIL) illuminated
⚠️ Active Air Dam not meeting expected output
⚠️ Degraded performance of related system
⚠️ ABS or stability control warning light

Common Causes

🔍 Active Air Dam degraded from age or contamination
🔍 Mechanical wear in Active Air Dam or related parts
🔍 Restriction or blockage affecting Active Air Dam
🔍 Calibration drift in Active Air Dam

Frequently Asked Questions

What does C0604 mean?

C0604 indicates: Active Air Dam Control Circuit Performance. The vehicle's computer has detected that the Active Air Dam is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code C0604?

Only short distances if absolutely necessary. C0604 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C0604?

Repair costs for C0604 typically range from $50 to $400, 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

🔧 Inspect Active Air Dam for contamination or wear
🔧 Replace Active Air Dam
🔧 Address any related mechanical faults

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.

C0604: Active Air Dam Control Circuit Performance