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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 > Water Pump Or Battery/Voltage Issue



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      08-31-2019, 03:05 PM   #1
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Water Pump Or Battery/Voltage Issue

Battery, water pump, thermostat are all roughly about the same age I replaced them all about 8-9 months ago. Battery was coded as well. Iím well aware that the water pumps are shit and knew Iíd have to replace it eventually again. But my question, can a voltage/power supply issue cause the the water pump codes? I ask due to the presence of the ibs missing and alternator missing codes.

Codes are:
3446 BSD Oil condition sensor: Missing
378F BSD message; electric coolant pump: Missing
3792 - Engine cooling system: Coolant pump speed out of tolerance
3847 - LIN / BSD message; Alternator missing
38A4 - BSD Message ibs missing
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      08-31-2019, 03:12 PM   #2
weehe126
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Yes those would be caused by the battery or alternator.
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      08-31-2019, 04:31 PM   #3
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Those are all on the same BSD Bus. Sounds like you have a bus communication fault.
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      09-03-2019, 10:54 AM   #4
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Dash showed the battery this morning on the way to work. Seeing as how the battery is basically brand new I assume itís the alternator or voltage regulator. Today was the first time Iíve seen the voltage below 12 since replacing the battery. Going to check the ibs lead this weekend as I did repair the wiring same time as the battery.
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      09-03-2019, 09:34 PM   #5
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Got a new code today which gives me a troubleshooting path 384A
Any of yall had success only swapping the voltage regulator? While I prefer the cheaper option I prefer more to do something once..in other words I dont want to take out the alternator to replace the regulator and the issue be the alternator bc then I gotta take it out again. Batter dash light also didnt come back on the drive home
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      09-04-2019, 01:31 PM   #6
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I have seen these codes also when coolant leaking from the pump shorts the connector.
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