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Low Beam bulb failures

Low Beam bulb H11 headlight short life

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#1 OFFLINE   plascell


    New Traverse Member

  • Traverse Member
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  • Gender:Male
  • Location:Virginia
  • Current Vehicle:2009 Traverse

Posted 05 March 2018 - 10:41 PM

I have been having multiple low beam bulb failures since 2015.  The dash volt meter doesn't seem to wander much above 14 volts (maybe 14.8 but never to the next line above which I think is 15.25).


Can the alternator output voltage be reprogrammed to reduce the max voltage by a tenth or so? 


Since these lamps are also the Daylight Running Lights, it seems like the system design should have switched in a diode drop (0.6 volts) when in the DRL mode and back to normal at night.


2009 Travers purchased Feb 2009.  Low beam headlight failure:

Dec 15, 2015   69470 miles    One failed but both replaced expecting another early failure.

Jun 11, 2016    73650 miles    Left Low beam failed

Jun 26, 2016    74420 miles    Right Low beam failed

Mar 25, 2017    82422 miles    Left  Low beam failed

Jun 18, 2017    84188 miles    Right Low Beam failed

Mar 4, 2018     91342 miles     Both failed on same day


Bulbs are H11 and I have used Sylvania and Bosch.  All bulbs are made in Germany. Manufacture claims 2000 hour life.  Last replacements are Phillips (waiting for them to fail).  If I were to drive for 2000 hours at 25 mph, I should be able to travel 50,000 miles.  Something is wrong / broke, but what?


Major dealer service:

New battery was installed by dealer Feb 10, 2016

Jan 23, 2017 dealer pulled engine for water pump, timing chains, sensors, and left axle

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