BMW E87 cooling system faults: water pump, thermostat and temperature sensor
E87 N43: what do fault codes 2E84, 2EF5 and P0597 mean?
The N43 engine has an electric water pump and an electrically heated thermostat. 2E84 means the water pump cannot be reached. 2EF5 and P0597 point to the thermostat's electrical control: the fault is in the thermostat or its wiring and connectors.
How do I fix the E87 water pump communication fault 2E84?
Replace the pump or thermostat only if it is truly faulty. First check the pump's wiring, connectors and ground. If the ground is loose, a new part alone will not fix the fault.
Why should the E87 coolant temperature sensor be replaced right away?
A faulty coolant temperature sensor makes the fan run constantly at full speed. The fault gets worse over time, and eventually engine power starts to be limited. Replacing the sensor is a relatively easy job.
Can the E87 be driven if the water pump or thermostat code is on?
The code can appear already when a part is ageing even though it still works, and the car may run normally. The replacement should still be done at a suitable service. The job is fiddly: many hoses have to be removed and the lowest bolts are in a tight spot.