I was hoping someone here could help I got my first car a 2009 Corolla and I’m getting a C1241 code Low or High Power Supply Voltage and now at stops sometime it would shake a lot and the check engine light would go on I got new battery and it went off then it started doing again this time I got a code for a bad Ignition coil so I replaced all the coils and spark plugs and the check engine light disappeared, but I still have the C1241 code and dash light ! In a triangle
AlsoBattery 12. 85vCraning testTime 869msVoltage 10. 86vCharging testLoaded 13.53vUnloaded 13.66vRipple 25mv
your fault for buying a brown man's carnext time try being not brown>>28911006>>28907306>>28913725
>>28914027Just replacing stuff randomly isn't how you diagnose problems, like replacing the battery and coils isn't going to fix the issue if it's coming from the alternator.Hard to say in this case, usually a bad alternator just leads to the check battery light coming on after a while, did that happen to you? I would've kept the original battery and charged it up with a charge pack to see if the code cleared before swapping, if it did and then came back you would know it was the alternator.
