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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3567
Experience:  Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
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Why does the car saying low voltage although ive changed the

Customer Question

why does the car saying low voltage although ive changed the battery
JA: How old is the battery? And have you tested it with a voltmeter?
Customer: yes i just purchased a need battery
JA: What is the model/year of your Mercedes?
Customer: cls 500
JA: What year is your Mercedes?
Customer: 2006
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: yes, i have changed the alternator, battery, and the car keep going in limp mode. the only thing that haven't been changed so far is the battery module located in the back trunk
JA: Anything else you want the mechanic to know before I connect you?
Customer: i have used a obd 2 scanner to diagnose the problem but the results are always low voltage as the error
Submitted: 8 months ago.
Category: Mercedes
Expert:  Chad Farhat replied 8 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 8 months ago.

hey how are you

1- if you hook a voltmeter to while the car is running with all the loads on ,ac, headlights , flasher radio etc.. , what are you getting 14 + volts

2- there is 2 batteries in the car which one you changed, the front one but not the rear trunk one is that correct ?

3- the Mercedes battery has to be registered to the car sometimes for the system to see it , does your scanner has the capability to do that , you mentioned only OBD2 scanner, we Need Star Mercedes Scanner or Equivalent to that ?

Please let me know

Thank You

Chad Farhat

ASE Certified Technician