P05E8
Engine Oil Bypass Valve Control Circuit/Open
P05E8 is an OBD-II diagnostic trouble code meaning: Engine Oil Bypass Valve Control Circuit/Open. Common causes: broken valve control circuit wiring, oxidation or damage to the valve connector. Estimated repair cost: $33–133.
Symptoms
- Check Engine Light Is On
- Possible noise from hydraulic timing elements during cold start
- Unstable operation of the variable valve timing system
- Unstable idling when the engine is cold
- Increased oil consumption in some cases
Causes
- Broken valve control circuit wiring
- Oxidation or damage to the valve connector
- Faulty solenoid valve (winding break)
- Valve clogged with oil (carbon deposits, dirt)
- ECU malfunction (rare)
How to Fix
- Read error codes, check for oil pressure or VVT codes
- Inspect the bypass valve connector, check the contacts
- Measure the valve winding resistance (standard: 10–30 ohms)
- Check the wiring from the valve to the computer for breaks
- Check the oil pressure (normal pressure is a sign of good mechanics)
- Replace the oil system bypass valve
Related codes
Error P05E8 by Vehicle Brand
FAQ
What does the P05E8 code mean?
P05E8 is an OBD-II diagnostic trouble code that indicates: Engine Oil Bypass Valve Control Circuit/Open
What causes a P05E8 error code?
The most common causes of P05E8 include: Broken valve control circuit wiring; Oxidation or damage to the valve connector; Faulty solenoid valve (winding break); Valve clogged with oil (carbon deposits, dirt).
How do I fix a P05E8 diagnostic trouble code?
To fix P05E8: Read error codes, check for oil pressure or VVT codes. Inspect the bypass valve connector, check the contacts. Measure the valve winding resistance (standard: 10–30 ohms). For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P05E8?
Limited driving only, diagnose soon
How much does it cost to fix P05E8?
The estimated repair cost for P05E8 is $33–133. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat