Powertrain, generic · Hybrid propulsion

P0D01 Control Pilot Charging Ventilation Switch Range/Performance

Check engine lightOn

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

The ventilation switch lets the vehicle request charging state D, in which a small resistor pulls the pilot down to about 3 V and the station may only deliver power with ventilation. P0D01 means this switch does not produce a plausible pilot level. GM documents the check for the Chevrolet Volt (VICM/HPC2): in a self-test with the cord unplugged and the diagnostic and ventilation switches closed, the ratio of pilot voltage to battery voltage must lie between 0.05 and 0.10 in the 2011 table, or between 0.04 and 0.10 in the 2016 and 2019 tables. 30 failed samples out of 50 at 100 ms set it as Type A, MIL after one trip; the pilot circuit and charging switch tests must have finished first. Circuit faults are P0D00, P0D02 and P0D03. If the switch really sticks closed, stations without ventilation will not supply power.

Likely causes

Internal fault in the VICM/charging module switching or measuring circuit

Ventilation resistor branch out of tolerance or high contact resistance

Leakage on the pilot line, for example moisture in the charge inlet

Symptoms

Malfunction indicator lamp on (GM Type A)
Charging possibly refused at stations without ventilation

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€100–1,200

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

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, en.wikipedia.org.