E60 523i 2005 N52 Engine

The car overheated on a 20 mile run a couple of days ago, with amber then red warning signs displayed. Water was low so topped it up.

The cooling fan is now kicking-in when starting from cold, and the amber warning light has appeared on a short journey.

A diagnostic check has thrown up the following codes:
2EF5 Thermostat characteristic, activation (Intermittent)
2E82 Auxiliary water pump, switching off (Intermittent)
2DED Power management, quiescent current fault (Intermittent)

I am wondering if one of the 28 codes is a knock on effect from the other?

Any help or advice would be much appreciated.

 

Classic symptoms of a dying water pump.
You need a new pump and you can be stranded at any time without a lot of warning.
I would not drive the car until you fix it.

 

+ thermostat

 

 

Many threads on this here and at bimmerfest.com

If you are doing this this is what you need for the fix and a couple preventative measures...

• one gallon of full strength BMW coolant
• one gallon of distilled water
• one Pierburg water pump
• one U-hose that attaches the pump to the thermostat -- this is a preventative measure since that hose is really hard to get to (this isn't absolutely necessary, but I have always done it)
• one Mahle-Behr thermostat (this may not be necessary, but I have always done it)
• one aluminum hose flange for the hose from the thermostat up to the engine block up near the oil filter housing -- looks like this -- Rein makes this one (this will break at some point for sure)