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Old 03-26-2020, 12:59 AM   #1
white46m54
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Join Date: Dec 2010
Location: Chicago, IL
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My Ride: 2001, 325i manual
Po1620

Hi Everyone!
I have a code PO1620 on my 325i 2001. I replace the thermostat with oem part and the code came back. I have always 14v at the thermostat's connector which makes no sense since engine temperature gets 100c in computer. For some reason the computer is triggered to sent always 14v at the thermostat. Ambient sensor checked ok. Negative terminal at the thermostat has no continuity with ground but it may be ok since is coming from the computer. Any ideas why?
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Old 03-26-2020, 04:37 AM   #2
BaliDawg
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My Ride: E39 E46 E84
P1620 BMW: Map Cooling Thermostat Control Circuit Signal High
https://www.autocodes.com/p1620_bmw.html

Map Thermostat
functional description: https://www.newtis.info/tisv2/a/en/e...ooling/Xw3xhPS
wiring diagram: https://www.newtis.info/tisv2/a/en/e...ooling/v0RgwpY

Google using this phrase to find what other folks on here did about that code.
“p1620 site:e46fanatics.com”
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Old 03-26-2020, 08:05 PM   #3
jdstrickland
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Quote:
Originally Posted by white46m54 View Post
Hi Everyone!
I have a code PO1620 on my 325i 2001. I replace the thermostat with oem part and the code came back. I have always 14v at the thermostat's connector which makes no sense since engine temperature gets 100c in computer. For some reason the computer is triggered to sent always 14v at the thermostat. Ambient sensor checked ok. Negative terminal at the thermostat has no continuity with ground but it may be ok since is coming from the computer. Any ideas why?


This is an invalid code.
1.) It's P0, not PO
2.) It's Pnnnn, not Pnnnnn
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