Question about 2001 Mercedes-Benz C-Class
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.
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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Posted on Jan 02, 2017
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
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