OBD-II code · Powertrain (generic)
P0B39 Motor Electronics Coolant Pump B Control Circuit Low
The motor electronics coolant pump B control circuit reports a control circuit low condition. Power electronics cooling cannot be commanded reliably on branch B.
Is it safe to drive with P0B39?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyControl wire shorted to ground
- PossibleInternal short in 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
- P0A06Motor Electronics Coolant Pump A Control Circuit Low
- P2BD5Motor Electronics Coolant Pump C Control Circuit Low
- P0B36High Voltage Service Disconnect Circuit High
- P0B37High Voltage Service Disconnect Open
- P0B38Motor Electronics Coolant Pump B Control Circuit/Open
- P0B3AMotor Electronics Coolant Pump B Control Circuit High
- P0B3BHybrid/EV Battery Voltage Sense A Circuit
- P0B3CHybrid/EV Battery Voltage Sense A Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.