OBD-II code · Powertrain (generic, extended)
P2B29 Hybrid/EV Battery Pack Coolant Pump A Overspeed - Dry Run
The hybrid control module detects that battery pack coolant pump A is running above the calibrated maximum speed without load. Indicates dry running due to coolant loss or air ingestion.
Is it safe to drive with P2B29?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyCoolant loss in battery loop
- PossibleAir drawn into pump suction
- Less likelyPack cell imbalance approaching service threshold
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
- 1–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Hybrid Battery Coolant Pump A, Battery Pack Coolant Loop
Related codes
- P2B26Hybrid/EV Electronics Coolant Temperature Sensor C Circuit Low
- P2B27Hybrid/EV Electronics Coolant Temperature Sensor C Circuit High
- P2B28Hybrid/EV Battery Pack Coolant Pump A Performance
- P2B2AHybrid/EV Electronics Coolant Pump A Overspeed - Dry Run
- P2B2BEngine Coolant Temperature Sensor 5 Circuit
- P2B2CEngine Coolant Temperature Sensor 5 Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.