P05D8
PCV Regulator Valve Control Circuit Open
The control circuit of the electrically actuated PCV regulator valve has an open circuit. The ECU cannot adjust crankcase ventilation flow against engine load - typically affects emissions and oil consumption under high load.
The control circuit of the electrically actuated PCV regulator valve has an open circuit. The ECU cannot adjust crankcase ventilation flow against engine load - typically affects emissions and oil consumption under high load.
Common causes
- high
Open in valve or harness
One of the most commonly reported causes for this code — check this first.
Typical part cost: $90-330
- low
Pin pushed back out of connector body
Less common, but worth ruling out after the more likely causes.
Typical part cost: $90-330
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
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Frequently asked questions
What does P05D8 mean?
P05D8 means "PCV Regulator Valve Control Circuit Open". It is a generic OBD-II code that points to a fault in the vehicle speed, idle control, auxiliary inputs.
What are the most common causes of P05D8?
open in valve or harness; pin pushed back out of connector body; cracked solder joint inside the module or sensor — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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