P0D01 code meaning
Control Pilot Charging Ventilation Switch Range/Performance
Powertrain system Generic code P0Dxx codes Check engine light
What P0D01 means
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.
P0D01 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0D01
- Malfunction indicator lamp on (GM Type A)
- Charging possibly refused at stations without ventilation
Common causes of P0D01
- PossibleInternal fault in the VICM/charging module switching or measuring circuit
- PossibleVentilation resistor branch out of tolerance or high contact resistance
- Less likelyLeakage on the pilot line, for example moisture in the charge inlet
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Control pilot ventilation switchWiring harnessOn board charger
What each part of P0D01 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 01 | The exact fault in that area. |
What to do next
- Note P0D01 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0D01
What does P0D01 mean?
P0D01 means "Control Pilot Charging Ventilation Switch Range/Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0D01?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0D01 fail an emissions test?
P0D01 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0D01 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0D01 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.