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By jagabom (Esquire) · Posted
So I was going to go for a drive in the 2011 GMC 1500 at 4am but when I started the truck, no low beams. High beams work. Separate bulbs. Now what. Google says that sometimes when one bulb goes the other goes in sympathy. Who knows when they went out. Did some testing. The connector that plugs into the bulb had 12 volts. The bulb showed open circuit implying that the bulb is gone. Replaced one bulb and it worked. Can't get the other bulb out of the headlamp assembly so have to remove the whole assembly. That will be in a couple days. Other things to do. Got it though Jim -
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After talking with a GM tech, that seemed to know what he was talking about, he told me to put a trickle charger on my battery overnight, that most always when the check for updates is greyed out, that means the battery needs extra charging, and according to him, its a battery in one of the modules, not necessarily the main starting battery. I did this, and then took a 10 mile trip, and when I shifted to park in my garage the message popped up to install the update, which installed successfully. I still don't have a couple of the latest updates from what I've seen, but maybe they will install now at some point. -
Couple plausibilities. - Bent pushrod - Bad injector - Roller lifter failed and has been eating the cam lobe(s). - Broken valve spring All are options. Most common that I can recall would be the valve spring (hard to see the break on it as well), the cam/lifter and the injector.
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