Dustin H
Junior Member
Sorry if posted in wrong place, new to this. I recently bought a 09 cobalt coupe and it runs and drives fine most days, but sometimes after turning it off when i try to start again it displays engine power reduced. Unhooking battery worked at first then pulling fuses now everytime it does this i have to disconnect batt. then the ECM and wait 10 minutes. CEL comes back on after driving a while, 1st time had it read their was 12 codes. I checked and cleaned most grounds, put ground on ECM and cleaned throttle body. Now i have 4 codes but still same dreaded problem as many others but the codes are P0507 (high idle, wich occurred after cleaning TB), P1682 (ignition 1 switch circuit 2), P0223 fuel pump relay control circuit), P0122 throttle position sensor 1 circuit low voltage). All help is greatly appreciated.
