OBD-II code · Powertrain (generic, extended)
P2B85 Engine Coolant Pump Underspeed
The engine coolant pump runs below the calibrated minimum speed for the commanded duty. Mechanical resistance high or supply voltage low.
Is it safe to drive with P2B85?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyMechanical load increased (binding)
- PossibleSupply voltage low under load
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Engine Coolant Pump, Ecm
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.