2e84 2E85 months after water pump replacement

taranfx · 05-30-2023, 02:05 AM

I got both Original thermostat and water pump replaced 4 months (~500 miles) ago with OEM parts and today car started overheating when oil temperature reached 250F on gauge.

-- DME active codes -

2E84 - BSD, message; electric coolant pump: Missing.
2E85 - BSD, message; electric coolant pump: Missing.

Error comes back immediately after clearing them.
Coolant doesnt run, even tried bleeding procedure. Also checked 2 fuses (passenger footwell). (And 50Amp fuse under the hood?)

Fan starts running full speed as oil temperature approaches 250F and then car loses power

Is this electric pump failing again? Or is it thermostat?

Symptoms are slightly different from last time.
Last time it failed, fan would go full speed and car would lose power within a mile.
Now it goes until oil temperature gets to 250 and then loses power

N54
2011 e89 Z4 35is 75k miles

TriumphTim · 05-30-2023, 05:18 AM

I would start simple and make sure the electrical connectors are 100% good at the pump.

05-30-2023, 02:05 AM	#1
taranfx Z4 35is 59 Rep 270 Posts Drives: 2011 Z4 35is \|\| 2016 435i Join Date: Apr 2016 Location: Santa Clara, CA iTrader: (0)	2e84 2E85 months after water pump replacement I got both Original thermostat and water pump replaced 4 months (~500 miles) ago with OEM parts and today car started overheating when oil temperature reached 250F on gauge. -- DME active codes - 2E84 - BSD, message; electric coolant pump: Missing. 2E85 - BSD, message; electric coolant pump: Missing. Error comes back immediately after clearing them. Coolant doesnt run, even tried bleeding procedure. Also checked 2 fuses (passenger footwell). (And 50Amp fuse under the hood?) Fan starts running full speed as oil temperature approaches 250F and then car loses power Is this electric pump failing again? Or is it thermostat? Symptoms are slightly different from last time. Last time it failed, fan would go full speed and car would lose power within a mile. Now it goes until oil temperature gets to 250 and then loses power N54 2011 e89 Z4 35is 75k miles __________________ 2011 Z4 E89 35is 2016 435i GC m-sport Last edited by taranfx; 05-30-2023 at 02:24 AM..
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05-30-2023, 05:18 AM	#2
TriumphTim Private 74 Rep 62 Posts Drives: 2008 328xi Join Date: Dec 2020 Location: Perkasie PA iTrader: (0)	I would start simple and make sure the electrical connectors are 100% good at the pump.
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