P05E6Park Brake Sensor/Switch Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- The engine module reads the park brake status, directly or via another module, because strategies depend on it: a parked diesel filter regeneration only runs with the park brake applied (Navistar), idle shutdown and PTO logic use it, and Ford delays an automatic restart while the electric park brake moves. CARB requires such inputs to be monitored. The only documented user of this code family is Volvo Trucks: since OBD 2021 a second park brake sensor (about 0.5 V applied, 3.5 V released) must agree with the old switch; the engine module reports the fault. No passenger car maker uses it verifiably. P05E6 is the one code of the family with a manufacturer description: at Volvo both signals must change together and agree; if they contradict each other or one changes late, the code sets. Volvo advises starting the diagnosis with the brake released.
- What you may notice
- Check engine light or OBD warning (heavy-duty)
- Park brake warning in the cluster
- Parked regeneration cannot be started
- Stop-start or idle shutdown not working
- Likely causes
- LikelyNew pressure sensor and old switch report differently (switch point, delayed change)
- PossibleFaulty diode in the switch circuit
- PossibleLow air pressure or leak in the spring brake circuit
- PossibleSwitch or sensor sticking or faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.