Question about 2007 GMC Sierra 1500

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Why is my truck not working?

Truck was fine when I put it in garage, but next day would not start. the engine wont crank. power locks and windows will not work. Head lights only work on low beam. 4way flasher wont work nor brake lights or dash gauges. Radio works , and horn. I have cleaned the battery cables and checked battery. I checked fuses, and starter connections. starter turns when I cross the solinoid switch. The fuel pump starts also. what am I missing? Any idea what the problem is?

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Year make and model are essential information. But it could be a fusible link if it's an older vehicle. Near the battery there should be wires that have a big molded rubber part inline on the wire. See if you can take a test light and poke through the insulation on the far side of the wire and see if there is one where the light does not light up. They sell them at auto parts stores. If it is a newer vehicle it could be a bad main power relay, or a bad body computer. And that's nearly impossible for me to help with online

Posted on Jun 12, 2017

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: Engine started on command start,

This is what must be checked as the start of the repair, 1st verify you have fuel pressure, at least 60 PSI, the test port is at the fuel supply rail on the injectors, it looks like a large tire valve, you will need the special fuel pressure test gauge to do this test, they are available from most auto parts stores for about $20.00, Next if you have no pressure listen for the pump running, pull the gas cap off, have some one trun the ignition key to run, you will hear the "hum" of the pump for 1 second, so you may need to repeat the key off and then on a few times. If you do hear the pump make sure you have gas, fuel gauges can be wrong, and have had many a car and truck towed in due to a fuel gauge showing fuel in tank when in fact it was dry. Next step check for fault codes in the memory of the Powertrain control module, you will need a OBD2 system fault code reader for this, they can be had at any Kragen or other auto parts store for about $50.00.

Posted on Feb 25, 2011

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