OBD-II code · Powertrain (generic)
P0A29 Hybrid/EV Battery Power Off Circuit High
Voltage on the hybrid battery power-off circuit is high the expected window. Safe HV disconnect signal compromised.
Is it safe to drive with P0A29?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWire shorted to B+
- PossiblePull-down resistor open
- 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.