OBD-II code · Powertrain (generic)
P05E9 Engine Oil Bypass Valve Control Circuit Low
Same as P05E8 with the control line shorted to ground. 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.
Is it safe to drive with P05E9?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–2 h
- Emissions test
- Likely to fail
- Parts involved
- Oil Bypass Valve
Related codes
- P05E6Park Brake Sensor or Switch Circuit Range or Performance
- P05E7Park Brake Sensor or Switch Circuit Intermittent or Erratic
- P05E8Engine Oil Bypass Valve Control Circuit Open
- P05EAEngine Oil Bypass Valve Control Circuit High
- P05EBCold Start SCR NOx Catalyst Inlet Temperature Too Low
- P05ECCold Start Injection Timing Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.