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General E46 Forum
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Old 02-19-2015, 09:30 AM   #1
ericcameron
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E46 Thermostat problem Code P0599 HELP!

Hello guys.

Sure hope you can HELP me on this one.

I have a 325 XI 2004 e46 and i have been having this problem for the last year or so.

Check engine light is on, and it gives me code P0599, Thermostat heater control circuit high.

I have changed my thermostat and the hoses, but i still get the code.

For the last 2 months or so, my prestone level goes down at about 3/4 cup per month. Therefore, my radiator light goes on as well.

There is no sign of radiator leakage, we have checked everywhere!

Anyone have sugestions on what i should do?
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Old 02-21-2015, 08:15 AM   #2
ericcameron
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P0599 code HELP! Thermostat circuit too high

Hello guys.



Sure hope you can HELP me on this one.



I have a 325 XI 2004 e46 and i have been having this problem for the last year or so.



Check engine light is on, and it gives me code P0599, Thermostat heater control circuit high.



I have changed my thermostat and the hoses, but i still get the code.



For the last 2 months or so, my prestone level goes down at about 3/4 cup per month. Therefore, my radiator light goes on as well.



There is no sign of radiator leakage, we have checked everywhere!



Anyone have sugestions on what i should do?
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Old 02-21-2015, 09:13 AM   #3
Hobbit382
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Open the ebox and remove the connectors on the dme. Check for wetness, corrosion or oil. If found you will need to replace harness, possibly oil pressure switch and tstat if still bad
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Old 02-21-2015, 09:44 AM   #4
ericcameron
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Thank you hobbit.

Could you please tell me where is the ebox and the DME?
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Old 02-21-2015, 09:53 AM   #5
ericcameron
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OK. Found it
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Old 02-21-2015, 09:54 AM   #6
ericcameron
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And what about my coolant diseapering?
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Old 02-21-2015, 11:02 AM   #7
HakenTT
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Quote:
Originally Posted by ericcameron View Post
And what about my coolant diseapering?
If there is no leaking then engine is slowly consuming the coolant, this means head gasket has lost it's seal
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Old 02-21-2015, 01:03 PM   #8
io14
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try reading this ! I'd get under the vehicle with it running and try to see where the leak is etc...............
pull the under carrage shields off to investigate. how many miles ?

http://www.obd-codes.com/p0599
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Old 02-21-2015, 01:52 PM   #9
ericcameron
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169,000 km. About 100k miles.
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Old 02-21-2015, 01:53 PM   #10
ericcameron
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Ok. Is it a Big job to do? Expensive?
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Old 02-21-2015, 06:09 PM   #11
Hobbit382
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Unless it runs poorly (misfires) on cold starts and over heats (or did overheat) I wouldn't worry too much about the headgasket, but if it does it's usually not just the head gasket, it's the threads in the block that pull out causing the head gasket to leak, which requires a new engine or repaired with time certs. Yes it's a big job 16+ hours.

Did you unplug and check the connectors for corrosion, wetness, or oil?
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