P05D8
PCV Regulator Valve Control Circuit/Open
Generic OBD-II
Common symptoms
What you'll notice
- Check the PCV valve and replace if necessary.
- Inspect the wiring and connectors associated with the PCV regulator valve control circuit and repair or replace as needed.
- Perform a thorough check of the engine for any vacuum leaks and fix them accordingly.
- Check the PCV system for any blockages or restrictions and clear them if found.
- If all else fails, consider replacing the PCV regulator valve itself.
Common causes
Most likely first
- Faulty PCV valve
- Damaged or loose PCV valve hose
- Improperly installed or faulty PCV regulator valve control circuit
- Clogged or obstructed PCV valve system
How to diagnose & fix
Work through it in order
- Check engine light may illuminate on the dashboard
- Engine may idle roughly or stall
- Decreased fuel efficiency or poor gas mileage
- Excessive oil consumption
- Loss of power or sluggish acceleration
Read & clear P05D8 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.