Question about 2007 Mercedes-Benz C-Class

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Something is draining my new battery when car is off(2007 c280 4matic), causing my blinker ,heat and speedometer to only work only after car runs for 20 minutes

Left my high beams on over night 2 times in one month( thats what triggered this problem. Trying to find someone that has a solution?

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  • ceara hayes
    ceara hayes Mar 19, 2014

    Thank you for these suggestions. After I left my high beams on the 2nd time car was dead, tried to recharge it but it seemed it never got fully charged. Went to Auto zone which read battery& Alternator was good. Went to Advanced auto after multiple times my car was dead(also wasnt driving much) Finally I took battery out & when they plugged in it read NEEDS TO BE REPLACED. Baught new battery installed & started up good. Didnt drive for 2 days & was dead(with new battery). Had to jump it & started fine, except that the heat , blinker, speedometer & ESP wasnt working. Once my car warms up it seems everything works 100% fine. The colder it is the longer i have to let my car run so that the heat etc works.

  • ceara hayes
    ceara hayes Mar 19, 2014

    Also my my check engine light comes on & off Reading code : U1055. which that means Communication Failure between instrument Cluster & control Module. I am far from mechanic & as a singlel mother cant afford just the diagnoses fee at Benz Dealership of $700 nevermind what it costs to fix problem. My car was perfectly fine before I left high beams on so Im hoping someone will know a solution!!!


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What is the liguid?

Posted on Mar 19, 2014

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SOURCE: Dead Battery

I would have the battery checked for a dead cell and acid level, also, if you have a meter that will measure amps, disconnect the battery and install the meter in line with the main power lead and see what leakage current there is, if none, its battery, if there is leakage, there is a problem on your vehicle which needs resolving

Posted on Sep 28, 2012

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SOURCE: If car is left parked for 2 weeks the battery is

had the same type problem with van that had security system on it.. even if not armed it would drain battery if not driven at least once a week. this might be same type of problem.

Posted on Nov 27, 2009

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SOURCE: 2001 MBs500 wont start

Sounds like the alternator is bad, you can take it to autozone and they will test it for free.

Posted on Dec 14, 2009

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