OBD-II code · Powertrain (generic, extended)
P2B86 Coolant Pump A Overspeed/Air in System
The coolant pump A runs above the calibrated maximum speed without producing the expected flow. Indicates air pocket in the coolant loop.
Is it safe to drive with P2B86?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyAir pocket in coolant loop
- PossibleCoolant level low
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Usually unaffected
- Parts involved
- Coolant Pump A, Engine Coolant Loop
Related codes
- P26FACoolant Pump C Overspeed/Air in System
- P2B65Coolant Pump B Overspeed/Air in System
- P2B6CCoolant Pump D Overspeed/Air in System
- P2DF7Coolant Pump E Overspeed/Air in System
- P2B83Charge Air Cooler Coolant Pump A Overspeed/Air In System
- P2B84Charge Air Cooler Coolant Pump A Underspeed
- P2B85Engine Coolant Pump Underspeed
- P2B87Coolant Pump A Underspeed
- P2B88Intake Air O2 Sensor Circuit Bank 1
- P2B89Intake Air O2 Sensor Circuit Low Voltage Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.