P2D3BHybrid/EV Discharge System Fault
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- After the contactors open, the capacitors of inverter and DC link still hold high voltage, so a discharge system, either a resistor or an active circuit in the power electronics, drains them within seconds. P2D3B is the general fault code for this system; the narrower ones are P0C75 and P0C76 for discharge time and P0EED for the discharge circuit. No manufacturer documents P2D3B publicly. GM's 2019 hybrid table shows how the drain is checked under P0C76: if the inverter still reads above 200 V 3.5 s after the main contactors opened, a Type A fault is set after two runs. Volkswagen patent US9586481B2 requests active discharge after a severe crash and treats it as complete below about 60 V. The car may refuse to restart, and nobody should work on the system without measuring that it is voltage-free.
- What you may notice
- Hybrid/EV system warning lamp on
- Vehicle does not become ready on the next start
- Likely causes
- LikelyFaulty active discharge switch or driver in the inverter
- PossibleOpen or degraded passive discharge resistor
- PossibleWrong high-voltage reading in the inverter or battery module
- RareContactor that does not open, so the bus stays fed from the battery
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €150 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.