OBD-II code · Powertrain (generic)
P05E8 Engine Oil Bypass Valve Control Circuit Open
The oil bypass valve - which routes oil around the cooler to speed up warm-up - has an open control circuit. Without it, oil temperature rise during cold-start is slower than calibrated.
Is it safe to drive with P05E8?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in valve or harness
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
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
- P05E5Park Brake Sensor or Switch Circuit High
- P05E6Park Brake Sensor or Switch Circuit Range or Performance
- P05E7Park Brake Sensor or Switch Circuit Intermittent or Erratic
- P05E9Engine Oil Bypass Valve Control Circuit Low
- P05EAEngine Oil Bypass Valve Control Circuit High
- P05EBCold Start SCR NOx Catalyst Inlet Temperature Too Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.