Google "e60 hidden menu" go to test 9 and monitor electrical system voltage while you drive. Turn on lights, rear defog, AC, Max fan speed to load up the electrical system and check voltage. Perhaps your real issue is the low, rough idle. Make sure that idle speed is normal and not too low when you experience low voltage at idle. Symptoms: The battery slowly drains over the course of a week (or two). But sometimes, in the morning, it’s been heavily discharged. Testing: The battery (AGM) is only 1 yr old and tested good by both BMW dealer and Pep Boys. Dealership ran an “Energy Diagnosis” and didn’t really find anything of note.
Speculative diagnosis. In any other car, I would guess this is a starter relay fault. Terminal 15N is post-start ignition on, and my guess is that the starter might be drawing too much power, causing the DME to brown out, causing all the above random shorts. The no other system (FEM, etc, etc) shows any faults on startup, so I might also
The most common causes for slow acceleration in BMW 5 Series are clogged air filter, dirty mass air flow sensor (MAF), clogged fuel filter, fuel pump malfunction, faulty oxygen sensor, worn spark plugs and clogged catalytic converter. Less common causes are bad ignition coils, dirty fuel injectors, clogged engine oil filter, transmission

E60 Alternator voltage Fluctuate at idle and Idle dip and bounce. This may be a well known issue in 2006 BMW 523i N52 engine , or similar models. ISSUE: Idle Fluctuate between 640 - 680, More often on engine operating temperature. while stoping at stoplight car shake little bit, rmp drop to ~630 for couple of sec and then raise up to normal.

E60Model Year: 2004 - 2009. M6; M8; Z4. 2020 BMW X5 2019 BMW M2C 2014 BMW 335i IF this is the "battery management" message vice an actual low battery message
Normal E60 system voltage for charging a battery in good health that is over 80% charged is generally 14.1-14.3 volts. For accelerated charging in cold weather the ECM may in rare instances charge AGMs as high as 14.7V and FLA as high as 15.5V as directed by the ECM/CAS based upon IBS feedback. 87Or.
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    • bmw e60 low battery symptoms