OBD-II code · Chassis
C0604 Active Air Dam Control Circuit Performance
Active air dam actuator does not respond as expected.
Is it safe to drive with C0604?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyActuator stuck mechanically
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–4 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Active Air Dam Actuator
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.