Q: 2011 740li say battery charge level low!

asked by on July 17, 2017

Car say battery charge level low

My car has 25560 miles.
My car has an automatic transmission.

It sounds like you may have a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator charges the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator pulley. The voltage regulator is a unit that regulates the charging of the battery by the alternator and maintaining a certain amperage while the engine runs. When the alternator is not working properly, this may result in the battery quickly losing charge and the car losing all power. You may also notice a whining sound as a result of the bearings inside the alternator begin to fail. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your charging system.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Po155cnf bank 2 sensor heater circuit P1620cnf Also code

The P0155 is the oxygen sensor located on the rear bank of cylinders and before the catalytic converter. Given your mileage, both oxygen sensors (pre-catalytic converter) should be replaced. The pre-cat sensors have the most affect on fuel mixture, saving...

How reliable is a 2009 bmw 328i?

Hi there. Buying a BMW with more than 100,000 miles can be risky. Some cars are very well maintained and may serve you very well. However, if the car was driven hard, or routine service; especially transmission and routine fluid...

How do I update my cars software? 2011 BMW 335d

Hi - you don't mention what software component of your vehicle needs updating (engine management, infortainment or navigation system, iDrive, etc.). In general, software updates need to be done by your BMW dealer or authorized service center with software update...

Related articles

A Buyer’s Guide to the 2011 BMW X6 ActiveHybrid
This This “Sports Activity Vehicle” – a moniker bestowed by its maker – is one of those few cars that toes the line between SUV, hatchback sedan, and a just plain quirky car. Regardless of its true identity, however, the...
Top 10 Factors to Consider When Buying a Luxury Car
The The idea of owning a luxury car is appealing. The glossy paint, swoopy lines, and prestigious badges speak of the owner’s success in life, while the interior opulence offers scented leather surfaces, high-tech telematic devices, and all the creature-comfort...
A Buyer’s Guide to the 2012 BMW 5-Series
BMW BMW has built a reputation for refined engineering, powerful performance and excellent fit and function. That’s exactly what you’ll find with the 2012 BMW 5-Series sedans. Composed and powerful, they provide a range of price points, features and capabilities...