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2009 GMC SIERRA
117,592 MILES • 4.8L • V8 • 4WD • AUTOMATIC
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SM09GMC
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  • 1 POST
Every now then while I'm driving the power locks will start clicking really fast and all my dash lights will spaz out and so does my radio. My mph and rpm needle will act up. And my motor will stall and chug for a few seconds. It's not throwing any codes. I took it in to dealership and they can't figure it out. Any ideas?
May 25, 2020 at 5:52 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good morning,

This sounds like low voltage.

I would have the battery tested for failing under a load.

https://www.2carpros.com/articles/car-battery-load-test

Have the charging system checked as well. Even if it is putting out 14 to 14.5 volts, switch it to AC volts and see if there is any AC voltage.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Clean the battery terminals as well.

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Roy
May 25, 2020 at 6:42 AM
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