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Tiny
SM09GMC
  • MEMBER
  • 2009 GMC SIERRA
  • 4.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 117,592 MILES
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?
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Monday, May 25th, 2020 AT 5:52 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Monday, May 25th, 2020 AT 6:42 AM

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