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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > ERROR 348A - Thermostat Stuck Open



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      08-06-2017, 12:14 PM   #1
Volair
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ERROR 348A - Thermostat Stuck Open

Hello,

I have E92 335i with N55 engine. Recently, the car would start up with the electric engine fan going on full-blast occasionally. There is only one code (see below). You would think that the thermostat is bad but take a look at the freeze-frame data. Would you agree that the coolant temp sensor may have gone bad? I don't think even Siberia would report -48C temperature

Thank you for any advice and insight given.
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      08-07-2017, 04:20 PM   #2
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Yea...it appears the DME is guessing the thermostat is stuck open because the temp isn't rising. But the temp isn't rising because the temp sensor is stuck at minimum temp.
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