Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P05E7 Park Brake Sensor/Switch Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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. P05E7 means the signal jumps briefly without being permanently low or high – changes without operation, while driving or too quickly in a row. The status is then discarded and regeneration or stop-start is blocked.

Likely causes

Loose contact or corrosion at connector or splice
Chafed wire with intermittent short
Switch bouncing or worn
Module connector

Symptoms

  • Intermittent check engine or park brake warning
  • Running parked regeneration aborts
  • Stop-start occasionally blocked

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–250
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

park brake switchpark brake sensorsensor wiring

Related codes

P05E3P05E4P05E5P05E6

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov.