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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 5783
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 2008 Yukon Denali... Service Charging system light

Customer Question

I have a 2008 Yukon Denali... Service Charging system light came on and vehicle wouldn't start so I tried giving it a jump... Once I attempted the jump all power shut down now their is no power at all
Submitted: 1 year ago.
Category: GM
Expert:  GM Tech (Cam) replied 1 year ago.

Hi there, I am Cam. Can I get your first name please?

With your yukon, to make sure I understand, you have absolutely no power to anything at all? No lights? Locks?

IF so, the place to start is to remove your battery and have it tested. This year range of GM vehicles were bad for the batteries failing and causing issues. Boosting may not help either. If nothing else we must be 100% certain by means of a load test that the battery is rock solid so we can move forward with testing. Testing the battery with a charger does not ensure its good. Most chargers only look to see if they are taking voltage/amps. If they do not then they think its good. Most part stores will test for free. Once we have this step, we can move forward. Are you able to do this and reply back to me?