OBD-II code · Powertrain (generic)
P0B38 Motor Electronics Coolant Pump B Control Circuit/Open
The motor electronics coolant pump B control circuit reports a control circuit/open condition. Power electronics cooling cannot be commanded reliably on branch B.
Is it safe to drive with P0B38?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyOpen in pump control wire
- PossibleOpen pump motor
- Less likelyPin pushed back out of connector body
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
- P0A05Motor Electronics Coolant Pump A Control Circuit/Open
- P2BD4Motor Electronics Coolant Pump C Control Circuit/Open
- P0B35High Voltage Service Disconnect Circuit Low
- P0B36High Voltage Service Disconnect Circuit High
- P0B37High Voltage Service Disconnect Open
- P0B39Motor Electronics Coolant Pump B Control Circuit Low
- P0B3AMotor Electronics Coolant Pump B Control Circuit High
- P0B3BHybrid/EV Battery Voltage Sense A Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.