noisy when in neutral. transmission malfunction message. hard transmission shifts instead of smooth ones. gear changes are erratic and may bump in one or more of the gears. the engine revs but doesn’t shift. lag when switching gears. check engine light illumination. fault codes. transmission or engine overheating.
If it's >14V, then current is going to your battery as the battery voltage is less than 14V. If the cable is warm, then you have excess current going to the battery. This assumes your alternator is working normally. If this cable is warm without the engine running, you have some parasitic current draw.
26105 posts · Joined 2015. #2 · Feb 8, 2022. Battery discharge warning is likely from the door handle problem. The Footwell Module is - in a word - a box of electronic ’circuit breakers’. It is much more than that and more complicated. It ain’t what you don’t know that gets you into trouble. It’s what you know for sure that just ain
Replaced the Contact relay on the fuse box (top-right) 3. Checked voltage on battery, alternator, jumping points, engine block, starter and got 12 volts when car is off (14 volts when on) 4. Made sure that the engine block is getting voltage, the grounding straps are not perfect but the engine is still getting the 12V.
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If you have a PC, you can get what is basically an A/D converter that plugs into a USB port and with some software functions as a low bandwidth (20 MHz) oscilloscope, which is at least1000 times more bandwidth then you need for automotive work. Search Amazon for "PC Oscilloscope". They are well under $100 for a dual channel model.
2. When measuring the battery with the engine on, the battery is on 14.2v (charging state from what i have read, meaning the alternator works). But after driving the car, turning the engine off and turning the ignition on. The battery low warning comes on in like 5 minutes. (already replaced and coded battery with a new one so it isn't that)
When I got home I used Carly to scan for fault codes and found a 009CCE fault code - "Drive passenger side mirror broken / Battery deep discharge". Tested both side mirrors - working fine. Cleared fault. Car is now running/starting fine.
speeds, the engines charging system will not. maintain the battery. Insufficient use of the vehicle. could result in short term starting problems. and in the long term could damage the battery. I assume the clock reset is the first sign that your battery is not getting enough regular charge.

The reality is that you, me, and all the people that buy BMW parts and cars paid for it. The battery was killed by the over voltage output from the alternator-17.2v. When you overcharge the battery with excessive voltage or current, it will boil the electrolyte off. The capacity of the battery then becomes permanently diminished.

The car is a 2010 E90 335d. After not driving it for a few days, I got in and tried to start it and it cranked really slow. It was obvious the battery was low, so I charged it overnight. At the same time, there was a light indicating the SOS system was disabled, the iDrive screen was blank, and there were no chimes of any sort. 11724 posts · Joined 2007. #7 · Mar 6, 2013. The BMW alternator is internally regulated, but it is "excited" by a 12V signal from the PCM rather than direct from the battery. That's why the PCM need to be advised when the battery is changed, so that the PCM controls charge rate appropriately. Can the regulator be changed without changing the Might be either a low battery or IBS problem. Tom. BMW4Lee Discussion starter. 824 posts · Joined 2007. #3 · Mar 11, 2012 (Edited) I am out of warranty, but I do have the BMW Platinum extended warranty. I am fairly sure it won't cover the battery, but I wonder if it will cover the IBS (if that is indeed the problem). Got my low battery symbol at about the same time as you KT, & it's been a street fight with my dealer ever since. "Are you driving enough?", "You need a trickle charger", "You aren't shutting down properly" BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Fuel pump failure or just low battery? 2aG2A.
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