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sprinkles08
sprinkles08, ASE Certified Technician
Category: BMW
Satisfied Customers: 21601
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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A0b4 is the code i am getting on a 06 526xi. Car will not

Customer Question

A0b4 is the code i am getting on a 06 526xi. Car will not crank or turn over after starter and battery replacement any ideas
Submitted: 1 year ago.
Category: BMW
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

Does the fuel pump run when the key is turned on?

What module was the code found in?

Customer: replied 1 year ago.
He says the dse or some type of immobilizer unit and im not sure of fuel pump but its silent when the start button is pressed and that code is some type of lockout for starter
Expert:  sprinkles08 replied 1 year ago.

Why was the battery replaced?

Is there communication with the engine controller?

Customer: replied 1 year ago.
Battery was dead as a doorknob and what do you mean about the engine controller?
Expert:  sprinkles08 replied 1 year ago.

The engine controller is the module that controls all engine functions. Using a scan tool does the ECM communicate?

Customer: replied 1 year ago.
thats how we got the code
Expert:  sprinkles08 replied 1 year ago.

You said that the code was from the immobilizer? In any event I don't have any reference for it.

What was used to read the code?

Customer: replied 1 year ago.
Everyone is saying it needs to be aligned by a scan tool in order to allow the starter to get power when pressing start button
Expert:  sprinkles08 replied 1 year ago.

There isn't anything that has to be done just because the battery was disconnected or replaced. You have a failure in the immobilizer system or an issue with the ECM.

What was used to read the code?

Customer: replied 1 year ago.
A regular obd scanner i believe i am planning to take to bmw but i was trying to get a idea of what i was facing
Expert:  sprinkles08 replied 1 year ago.

Do you have the brand and model of what you're using so I can see what it's capabilities are? If it was an OBDII code reader it wouldn't have had the capability to communicate with the immobilizer module.

Customer: replied 1 year ago.
it was a regular obd 2
Expert:  sprinkles08 replied 1 year ago.

Do you have the actual P code number that was stored?

Customer: replied 1 year ago.
I can try to get ...this is the only code hes given me
Expert:  sprinkles08 replied 1 year ago.

All vehicles sold in the US from 1996 onward are required to report in the standard P code format, a P and four digits. What you've posted looks to be in the form of proprietary manufacturer coding but the factory service information doesn't list that as being valid.

Customer: replied 1 year ago.
We are getting power at the starter relay when the button is pressed but no power at the starter itself
Expert:  sprinkles08 replied 1 year ago.

Are there two power feeds at the relay? Does the relay click?

Customer: replied 1 year ago.
the relay clicks
Expert:  sprinkles08 replied 1 year ago.

Are there two power feeds at the relay when attempting to crank?