P2D9FHigh Voltage System Voltage High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2D9F is the over-voltage case: the DC voltage on the high-voltage network rises above the permitted maximum. Too much voltage stresses capacitors, power semiconductors and cells, so controllers react within milliseconds by cutting regeneration or charging. No manufacturer documents P2D9F publicly. GM's eAssist table of 2013 gives a comparable check under its own code P1AEE: the motor control processor flags system voltage high when its HV sensor reads more than 150 V or a hardware over-voltage flag is set, two trips, Type B. Typical triggers are strong regenerative braking with a full battery, a contactor opening while the motor still generates, or a drifting voltage measurement. Expect reduced regeneration, limited power and a warning light.
- What you may notice
- Hybrid or EV system warning and check engine light
- Little or no regenerative braking, more wear on the friction brakes
- Power limited or HV system shut down
- Likely causes
- PossibleRegenerative braking or charging while the battery is already full or cold
- PossibleContactor or HV connection opening while the motor generates
- PossibleVoltage measurement in the inverter or controller reads too high
- RareVoltage limits in control software too tight, update available
- 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 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.