OBD-II code · Powertrain (generic, extended)
P2D9E High Voltage System Voltage Low
The high-voltage system voltage is below the expected window. HV battery output drops, isolation event, or loaded too heavily.
Is it safe to drive with P2D9E?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyHV battery cells aged
- PossibleBMS regulation outside calibration
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–16 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery, Bms, Hv Bus
Related codes
- P2D9BStarter/Generator Phase U Current Circuit Intermittent/Erratic
- P2D9CStarter/Generator Phase V Current Circuit Intermittent/Erratic
- P2D9DStarter/Generator Phase W Current Circuit Intermittent/Erratic
- P2D9FHigh Voltage System Voltage High
- P2DA0High Voltage System Voltage Performance
- P2DA1Gear Shift Control Module B Supply Voltage Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.