Powertrain, generic · Hybrid propulsion

P0D00 Control Pilot Charging Ventilation Switch Circuit/Open

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Some battery types can give off gases while charging; for that case the conductive charging standards provide a state in which the vehicle asks the station for ventilation. The vehicle signals it by switching a much smaller resistor of about 270 Ω onto the pilot, which drags the level to around 3 V; the station then only delivers power where ventilation is assured. P0D00 reports that the control circuit of this ventilation switch is open. No manufacturer documents this code publicly; GM's Chevrolet Volt monitors the switch for plausibility only (P0D01, normalized pilot voltage 0.04-0.10 in a self-test), and CARB requires plug-in vehicles to monitor the charging system. During normal charging the switch stays open, so an open circuit often goes unnoticed except for the stored code. Shorts are P0D02/P0D03.

Likely causes

Open control wire or loose connector of the ventilation switch circuit
Ventilation switch or its resistor branch open inside the module
Failed driver stage in the charging control module

Symptoms

  • Stored code, charging usually still works
  • Charging system warning in the cluster

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–900
Time0.5–3 h

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

Parts involved

control pilot ventilation switchwiring harnesson board charger

Related codes

P0D01P0D02P0D03P0D04P0D05P0D06

References: law.cornell.edu, en.wikipedia.org, gsi.ext.gm.com.