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General E46 Forum
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Old 07-03-2016, 10:51 PM   #1
md517
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So, um P1624 anyone?

So I just got the P1624 SES on my 2000 e46. I know this is computer/ engine specific, so I have a 2000 328i M52tub28 engine 5 speed auto/sport I believe the date of MFG is around march of 99. I've heard it could be the thermostat with my model and year. I replaced the upper/lower coolant hoses, expansion tank, and I think the thermostat is at the bottom of the expansion tank so that was replaced as well September of 2015 . I did not replace the temp sensor on the lower hose, could that be it? Anyways just wondering if anyone has come up with this issue? Before I leave for work tomorrow I am going to check coolant level, But anything helps!
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Old 07-04-2016, 07:50 AM   #2
markusmarkus
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So, um P1624 anyone?

The thermostat is on the engine! The code reads "Thermostat Control Circuit Malfunction." The thermostat has an electrical connector. This is used by the engine computer (ECU) to hasten the opening of the thermostat.

http://www.realoem.com/bmw/enUS/show...diagId=11_2180

Part #4 is the thermostat. You'll note that part #10 is the connector I've written about.

Last edited by markusmarkus; 07-04-2016 at 07:55 AM.
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Old 07-04-2016, 03:26 PM   #3
md517
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Ok, Thanks! Last night when I got home I cleared the code and then this morning checked coolant level, it was full. Drove to work and back about 15 minutes each way, engine heated up in normal time each way to operating temp. The light didn't come back on. Ill see if I can clean the electrical contacts on the thermostat, maybe it was just a glitch. Time will tell, Thank you for the real oem page!
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Old 07-05-2016, 04:11 PM   #4
md517
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Alright on my way to work this morning the light came back on. The engine still heated up in the regular amount of time. Does this still mean the thermostat is bad or would the problem be elsewhere in the circuit?
Thanks again.
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Old 07-06-2016, 07:45 AM   #5
markusmarkus
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I bet the thermostat heating element is going bad. What brand is the thermostat? How old is it?
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Old 07-06-2016, 04:03 PM   #6
md517
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Haha well it's probably the original thermostat, 188,000 miles
It's probably bad. I'll buy one from turner motersports tonight.
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Old 07-07-2016, 07:09 AM   #7
markusmarkus
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Try fcpeuro for parts. The parts come with a lifetime warranty. I doubt that the thermostat is the original thermostat!
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Old 07-07-2016, 08:34 AM   #8
idriveastick
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I just ordered the kit from ECS which includes a gallon of coolant, the t-stat, and the o-ring. All genuine BMW. I think it's like $90...
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Old 07-07-2016, 12:17 PM   #9
md517
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Shoot I wish I had known about fcpeuro, I'll buy from them next time. I bought from ecs. Thanks for the help! I'll post on here when after I replace it.
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Old 07-08-2016, 07:19 AM   #10
markusmarkus
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You're welcome.
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coolant, expansion tank, service engine soon, temp sensor, thermostat

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