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C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

"SYS" flash

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Old Oct 16, 2009 | 06:58 PM
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From: bend or
Default "SYS" flash
93 with 21000 miles. The speedo section that displays MPG alternately flashes "SYS". All the manual tells me is to see the dealer. Scan tool shows all systems normal, no codes stored. What is causing this?
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Old Oct 16, 2009 | 07:23 PM
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Probably a weak battery.
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Old Oct 18, 2009 | 07:09 AM
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Originally Posted by STL94LT1
Probably a weak battery.


Charge it up!
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Old Oct 18, 2009 | 12:04 PM
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The sys message is due to codes stored in your ccm. They wont always set codes if they are for something minor like your climate control. Pull the flash codes using the technique in the GM service manual. Rob
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