Powertrain, generic · Hybrid propulsion

P0D02 Control Pilot Charging Ventilation Switch Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

P0D02 marks the control or feedback line of the ventilation switch as too low, usually a harness wire grounded somewhere along its route or a charging module driver that has failed shorted. That switch places a resistor of about 270 Ω across the pilot so that the level falls to roughly 3 V, the state in which a vehicle demands charging with ventilation. No manufacturer documents this code publicly; GM's Chevrolet Volt evaluates the same switch by the pilot level it causes (P0D01, ratio 0.04-0.10 in a self-test), and CARB requires plug-in vehicles to monitor the charging system. If the short holds the switch closed, a station without ventilation will refuse to deliver power; if it holds it open, the fault mostly shows only as a stored code. The high-side fault is P0D03, the open line P0D00.

Likely causes

Ventilation switch control or feedback wire shorted to ground
Shorted driver stage in the charging control module
Corrosion in a connector bridging the line to ground

Symptoms

  • Charging refused at stations without ventilation
  • Stored code without noticeable effect

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

P0D00P0D01P0D03P0D04P0D06

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