What it means
Same as P05E8 with the control line shorted to supply. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The engine oil bypass valve is operated through a control circuit monitored by the control module. This high-circuit code sets when the monitored line is above its expected range, commonly due to a short to a power supply or a faulty connection.
Common causes
Most likely first.
- Control line shorted to supply
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
Symptoms
- Check-engine light may illuminate
- Oil temperature or engine warm-up behavior may be affected
How to diagnose it
- Record freeze-frame data and note any oil-temperature or warm-up symptoms that occurred when the code set.
- Inspect the oil bypass valve connector for corrosion, loose terminals, pushed-back pins, or moisture.
- Trace the control line for pinching or chafing where it could contact a powered wire or terminal.
- Using the wiring diagram and the specified isolation procedure, test the line for a short to supply and compare results with the manufacturer's specification.
- If the harness has no short, test the valve circuit and control-side connections against the manufacturer's specification.
Common fixes
- Secure a loose oil bypass valve connector.
- Clean or repair corroded or damaged terminals.
- Repair the control wire where it is pinched or shorted to a supply.
- Replace a valve that fails electrical testing.
Can I keep driving?
Limit driving and arrange diagnosis soon if oil temperature or warm-up behavior is abnormal, since the bypass valve may not respond correctly. Stop the engine for an oil-pressure warning, unusual engine noise, or overheating.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.