Q: No start and buzzing noise - 2006 BMW 525xi

asked by on

I was having trouble with my car starting this morning. I got in, put the key in the groove, pressed the button and it wouldn’t start. I just heard a buzzing noise. My brake pedal was firm, the steering wheel wasn’t locked and the radio, lights and the air conditioner were all turned on. My battery is less than a year old, too. Do you know what could be wrong?

The battery still needs to be checked to ensure there is a charge level sufficient for starting the vehicle. There could be a possible issue with the CAS module. This computer is part of the starting immobilizer system. It verifies a valid key remote and then in concert with the engine computer and transmission computer will initiate the engine starting sequence. Again low battery voltage can cause this process to malfunction. The battery needs to be charged and load tested to ensure it is not faulty. If the battery checks out good, then the CAS system will need to be interrogated by a scan tool capable of reading its information and if it needs to be replaced then it will need to be purchased from a dealer and programmed in order to be operational. You may need to consult a BMW dealer or specialty shop to determine the source of starting system failure.

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
  1. Home
  2. Questions
  3. No start and buzzing noise - 2006 BMW 525xi

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

Q: Car loses throttle and starts to putter then Car computer says engine power reduced then engine disabled.

Hi there. It is very likely that you are having problems with the throttle body on your Pontiac G6. If you are seeing the reduced engine power light on the dash, it is typically triggered by a faulty throttle body,...

Q: accidentally hooked up jumper cables backwards. No there is no spark on plugs and the fuel pump is running with the engine off.

Hi there. The U codes are for the body portion of the electrical system. U114 codes are designated to the fuel system. If the fuel pump is working but all of a sudden it is coming on when the engine...

Q: Is my problem my ECM relay?

Hello and thank you for contacting YourMechanic. First you will need to charge or replace your battery. Most of the time, if a battery has a burned cell or will not hold a charge, then it causes a lot of...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...