OBD-II code · Powertrain (generic)
P0A28 Hybrid/EV Battery Power Off Circuit Low
Voltage on the hybrid battery power-off circuit is low the expected window. Safe HV disconnect signal compromised.
Is it safe to drive with P0A28?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWire shorted to ground
- PossibleInternal short
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–7 h
- Emissions test
- Usually unaffected
- Parts involved
- Hybrid Battery Power Off Circuit, Wiring Harness, Bms
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.