OBD-II code · Powertrain (generic)
P04E3 Crankcase Ventilation Hose Connection Sensor Circuit High
Same as P04E1 with the signal voltage above the plausible range. 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 P04E3?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1.2 h
- Emissions test
- Likely to fail
- Parts involved
- Pcv Hose Connection Sensor
Related codes
- P04E0EVAP System Purge Control Valve A Stuck Closed
- P04E1Crankcase Ventilation Hose Connection Sensor Circuit
- P04E2Crankcase Ventilation Hose Connection Sensor Circuit Low
- P04E4Crankcase Ventilation Hose Connection Sensor Circuit Intermittent or Erratic
- P04E5EGR Temperature Sensor D Circuit
- P04E6EGR Temperature Sensor D Circuit Range or Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.