P0D00 code meaning
Control Pilot Charging Ventilation Switch Circuit/Open
What P0D00 means
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.
P0D00 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0D00
- Stored code, charging usually still works
- Charging system warning in the cluster
Common causes of P0D00
- PossibleOpen control wire or loose connector of the ventilation switch circuit
- PossibleVentilation switch or its resistor branch open inside the module
- Less likelyFailed driver stage in the charging control module
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 P0D00 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 00 | The exact fault in that area. |
What to do next
- Note P0D00 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 P0D00
What does P0D00 mean?
P0D00 means "Control Pilot Charging Ventilation Switch Circuit/Open". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0D00?
P0D00 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0D00 fail an emissions test?
P0D00 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 P0D00 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0D00 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.