Question about 2001 Mercedes-Benz C-Class
2001 C240 ''Undervoltage Consumer Defective''
UNDERVOLTAGE CONSUMER DEFECTIVE come up on the dash so i did not drive the car .The next day the battery was down and so i took the battery to the garage for charging after which i put it back on, same problem. I bought a new battery and the sign went off and came back after sometime(5mins).
Just the other day i was driving and different messages were popping up... the system was going crazy, you know like it was going out of breath then the car was not accelerating so i parked by the side of the road. The car would not start after i turned it off but after about 30mins it started and i drove abit then it started showing all kinds of messages, acting crazy.What does UNDERVOLTAGE CONSUMER DEFECTIVE means. What do you think is the problem with my car thank you.
Sounds to me like a voltage regulator issue. This is attached to the alternator and monitors how much voltage is sent back to the battery. Any decent parts store should be able to hook up a charging system tool-most common is a Vat-40 and check the system. And they will probably do it for free. If there is an issue with the charging system, then try the voltage regulator first, as opposed to the alternator-there is quite a price difference I assure you. Let me know what you find.
Posted on Nov 20, 2008
I have the same problem, I've changed the alternator and the battery but the same fult apears on the dashboard again, I left the car at the workshop but they can't address the problem the only feed back I've got is "the alternator is fine and the output is 14.6v but it dos not charge the battery" and they do not know how to fix the problem.
is there anyone out there who can help with a reasonable soloution?????
it's a E200 2002
Posted on Apr 18, 2012
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Posted on Jan 02, 2017
The same thing happened to me and it turned out to be the alternator. Need to replace your alternator. Easy check, start the car and check the DC voltage of the battery, with the car running you should read around 14 volts. If you are reading 12-12.25 volts then the alternator is not generating.
Posted on Feb 06, 2009
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