Question about 2001 Mercedes-Benz C-Class

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UNDERVOLTAGE CONSUMER DEFECTIVE

The following fault is be shown on my display screen "UNDERVOLTAGE CONSUMER DEFECTIVE".

What fault does my car have? I am not sure what that sign means. Does my battery need charging?

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

Posted on Nov 06, 2008

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I suspect the main problem is the alternator. When the alternator is failing it can be intermittent (ok some times and then stops). The battery on a vehicle is there to turn the starter and as a buffer for the engines electrical system. When the alternator stops charging with the engine running the overall voltage of the electrical system cannot be handled by the battery and systems will start to shut down like the radio and wipers until the vehicle stalls. Then in some cases you can still restart, the alternator kicks back in and everything looks normal.If you are familiar with checking voltages, to check this with a volt meter, you would want to see 13 volts to 14.5 with the engine running (alternator charging). If you see less than 13 volts the alternator is not charging. If you want to make sure you can have the faults read at the dealer and they should see undervoltage faults that have set when the alternator had stopped charging. Also, to check yourself, when the problem is occuring you can use a volt meter to check the voltage at the jump terminal to see what the output of the alternator is. This would even set the ****** malfunction due to an undervoltage and the system would go into failsafe.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.


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Mar 05, 2012 | BMW 325 Cars & Trucks

1 Answer

I got a c-class mercedes and on my dash board today appeared UNDERVOLTAGE CONSUMER DEFECTIVE. what can i do?


Check your battery and voltge when car is running if les than 12 when off than battery is flat, if less than 14 when running then it's not charging like it should.
If its charging ok and battery under 12 you need to replace battery.
If its not charging ok than it's alternator- Hope i helped!

Jan 25, 2011 | 2001 Mercedes-Benz C-Class

1 Answer

Tea spilled in the backseat and shortly after the srs fault light came on. took it to be scoped and code b1010 came up?is this expensive to fix


B1010 The supply voltage of the control unit is too low (Undervoltage). STORED
Better check under the rear seat and see if there is a control module under there.

Feb 05, 2010 | 2002 Mercedes-Benz C-Class

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Reset the service engine indicator on a 2002 bmw x5


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2 Answers

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.

Nov 18, 2008 | 2001 Mercedes-Benz C-Class

1 Answer

2001 C240 ''Undervoltage Consumer Defective''


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.

Nov 18, 2008 | 2001 Mercedes-Benz C-Class

3 Answers

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.

Nov 06, 2008 | 2001 Mercedes-Benz C-Class

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