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2006 silverado 5.3L LT..brake system..airbag light..dealership…

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I have a 2006 Silverado...
I have a 2006 Silverado 5.3L LT with 42000 miles. About the 30,000 mile mark my Service brake system light and service Airbag light which repeatedly comes on while driving under 35 miles a hour. I have gotten it diagnoised by the dealership and wasn't able to find the problem. I have had everything serviced and no fix. I have also changed out the ingnition switch which was a reccomendation from the dealership.THe problem also cuts off all power to instrument cluster, radio and lights. Can anyone help.
Submitted: 8 years ago.Category: Chevy
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Answered in 5 hours by:
6/29/2010
Chevy Mechanic: BOBBYSS, Master Technician replied 8 years ago
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,611
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
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HelloCustomer do all of these problems typicall occur at the same time?
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Customer reply replied 8 years ago
Yes, as soon as i get under 35 mph the service air bag warning, service brake system warning pops up and my power to my acessories such as gauges and radio turn off.
Chevy Mechanic: BOBBYSS, Master Technician replied 8 years ago
Okay, and will all of these systems work fine after the vehicle is restarted?
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Customer reply replied 8 years ago

The engine is running the whole time its just the instrument cluster radio and lights that turn off, but they will come back on when i go above 35 miles an hour.

Chevy Mechanic: BOBBYSS, Master Technician replied 8 years ago
One last question. Do the gauges also just stop working or just the panel lights?
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Customer reply replied 8 years ago
All the gauges zero out or stop working until i increase my speed to over 35 mph
Chevy Mechanic: BOBBYSS, Master Technician replied 8 years ago
Okay. It sounds like a bad ground under the drivers side of the dash. It is located as shown. You need to get under the dash to access it. If the ground is fine then you either have a wiring problem under the drivers seat or a problem starting within the PCM.

graphic
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Customer reply replied 8 years ago
What exactly is a PCM?
Chevy Mechanic: BOBBYSS, Master Technician replied 8 years ago
The PCM is the vehicles main computer.
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Customer reply replied 8 years ago
What the price on a brand new PCM?
Chevy Mechanic: BOBBYSS, Master Technician replied 8 years ago
A new PCM typically runs about $500-600.
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Customer reply replied 8 years ago
would a performance pcm work bine as a replacement or make my problem worse?
Chevy Mechanic: BOBBYSS, Master Technician replied 8 years ago
If the problem is actually in the PCM then it will help, but I would check this ground first.
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