OBD-II code · Powertrain (generic)
P0B3A Motor Electronics Coolant Pump B Control Circuit High
The motor electronics coolant pump B control circuit reports a control circuit high condition. Power electronics cooling cannot be commanded reliably on branch B.
Is it safe to drive with P0B3A?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyControl wire shorted to B+
- PossibleOpen pump motor
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 2–7 h
- Emissions test
- Usually unaffected
- Parts involved
- Motor Electronics Coolant Pump B, Wiring Harness, Hybrid Control Module
Related codes
- P0A07Motor Electronics Coolant Pump A Control Circuit High
- P2BD6Motor Electronics Coolant Pump C Control Circuit High
- P0B37High Voltage Service Disconnect Open
- P0B38Motor Electronics Coolant Pump B Control Circuit/Open
- P0B39Motor Electronics Coolant Pump B Control Circuit Low
- P0B3BHybrid/EV Battery Voltage Sense A Circuit
- P0B3CHybrid/EV Battery Voltage Sense A Circuit Range/Performance
- P0B3DHybrid/EV Battery Voltage Sense A Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.