Question about 2001 Mercedes-Benz C-Class

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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.

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  • agressivel Feb 18, 2009

    I had the same problem I replaced the battery and alternator because the alternator went and the car shut off and the battery went dead now my car will crank but won't turn over do I have to reset something like the fuel pump switch? I dont know what's wrong now?

  • msn6 Feb 23, 2009

    i've drive my benz c240 (mod.2001) 69000 KM without any fault or error, from about a week each morning my battery is low so i recharge it till i change it after 3 days, cause its going low from night till morning alone even that i removed all the chairs cables & i turned off the lamps... today suddently when i was driving the benz on road all the lamps in the dashboard goes on & the benz turn off totally, parked on the road i tried to turn on again, the engine crank but it doesnt turn on, after about 30 min i tried again & the car turn on as nothing happened but with the check engine light i drive the car about 10 km then same problem all the dashboard lights goes on & the car turn off but this time as the dashboard screen goes red not yellow & with a battery image.
    i left the car about 30 min & it turn on again.
    now the benz is under my house, what should i do & what is the problem u think ???

    thank you again,
    Fraternally:.
    Tony Nassar | msn@TonyNassar.com

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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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SOURCE: C240 UNDERVOLTAGE CONSUMER DEFECTIVE

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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Posted on Jan 02, 2017

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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.

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Undervoltage consumer defective


Regarding the first problem, there is possibly an oil level sensor issue or vehicle version coding issue(both can be more fully checked at a dealership). The second problem is not uncommon. Obviously, there could be a low voltage if the vehicle sits for a long time or is not driven alot. Sounds like the ac system lost synchronization due to lack of voltage. With vehicle running, you should be able to press and hold recirc/rest or recirc/defrost buttons on ac control panel(can't quite remember which combination). Press and hold until leds start flashing, then the ac system will go through a resynch phase. If it completes this and the led's stop flashing, then it's ok. If it does not and the led's flash very quickly, this indicates an actual malfunction of ac system adjustment motors.

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1 Answer

UNDERVOLTAGE CONSUMER DEFECTIVE


i have the same problem with my 2001 C240 and my a/c does not work properly as a result.

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