OBD-II code · Powertrain (generic)
P05E4 Park Brake Sensor or Switch Circuit Low
Same as P05E3 with the signal 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 P05E4?
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 ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.2 h
- Emissions test
- Usually unaffected
- Parts involved
- Park Brake Switch
Related codes
- P05E1A/C Refrigerant Pressure Sensor A Circuit Intermittent or Erratic
- P05E2A/C Refrigerant Pressure Sensor B Circuit Intermittent or Erratic
- P05E3Park Brake Sensor or Switch Circuit
- 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
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.