OBD-II code · Powertrain (generic, extended)
P2B84 Charge Air Cooler Coolant Pump A Underspeed
The charge air cooler coolant pump A runs below the calibrated minimum speed for the commanded duty. Mechanical resistance high or supply voltage low.
Is it safe to drive with P2B84?
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
- Cac Coolant Pump A, Cac Coolant Loop
Related codes
- P2CB2Charge Air Cooler Coolant Pump B Underspeed
- P2B81Wastegate Position Sensor A Circuit Performance
- P2B82Wastegate Position Sensor B Circuit Performance
- P2B83Charge Air Cooler Coolant Pump A Overspeed/Air In System
- P2B85Engine Coolant Pump Underspeed
- P2B86Coolant Pump A Overspeed/Air in System
- P2B87Coolant Pump A Underspeed
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.