"SYS" flash

55c3pu · 10-16-2009, 07:58 PM

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?

STL94LT1 · 10-16-2009, 08:23 PM

Probably a weak battery.

GS023 · 10-18-2009, 08:09 AM

Quote:

Originally Posted by STL94LT1

Probably a weak battery.

Charge it up!

robslittleoldv8 · 10-18-2009, 01:04 PM

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