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: Knocking/ticking sound when engine idles

The only way to diagnose a knocking noise is to hear it to see if the noise is in the top or bottom of the engine. If from the bottom, then a piston, rod, or crankshaft problem is present. If...

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

Hello - the engine management computer controls the fuel pump (through a relay). The lack of spark may be related to a failed crankshaft position sensor, or possibly one or more of the coil packs. Failure of these will yield...

Q: New battery dead from trying to start car.

This engine had quite a few different issues that may of caused a no start. The list is ignition module, distributor stator, fuel pump, fuel pump relay, timing belt, ignition coil and wiring issues. The only way to fide the...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.