I know this site is for new malibus, but I couldn't find a forum for older ones. My sister has an 01 malibu with about 100,000 miles on it. I just scanned the computer and got 2 codes one is p0404 and c0900. the p0404 is an egr code but the second is listed as "Device #1 Voltage High." Does anybody know what this refers to? Any help would be greatly appreciated.