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

P05DA PCV Regulator Valve Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

Some turbo engines have an electrically controlled crankcase ventilation valve that decides when and how much blow-by gas is drawn into the intake (part-load versus full-load path). The engine module monitors its driver output; CARB requires output components to be checked for circuit faults and the PCV system to be monitored. Nissan's 1.5 L KR15DDT (Rogue 2024–25) sets P05D8/P05D9 with the warning lamp from a severed harness at the valve; Mercedes M270/M274 have such a valve but report it under P052E. P05DA means the control line is too high – a short to battery voltage or, with a low-side driver, overcurrent when on. No manufacturer document available to us uses P05DA itself.

Likely causes

Control line shorted to positive
Valve coil low-resistance (shorted turns)
Faulty harness repair (swapped wires)
Engine module

Symptoms

  • Check engine light on
  • Often no noticeable symptoms
  • If the valve sticks: oil mist, blue smoke, rough idle

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–500
Time0.5–2 h

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

Parts involved

pcv regulator valvevalve wiringengine control module

Related codes

P05D8P05D9P052EP04DBP053AP051A

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