Question

I got the codes U0100, C1241, and C1201 coming up and the car is stalling and not starting. I have a 2010 Toyota Corolla S 1.8L

Answer 1

Looks like the problem is with the Engine Control Module (ECM) communication and performance. Low battery voltage could have caused the problem. Start by checking the battery voltage and alternator charging

U0100 TOYOTA Code - Lost Communication With Engine Control Module/Powertrain Control Module
Read more: https://www.autocodes.com/u0100_toyota.html

C1201 TOYOTA Code - Engine Control System Malfunction
Read more: https://www.autocodes.com/c1201_toyota.html

C1241 TOYOTA Code - Low Battery Positive Voltage
Read more: https://www.autocodes.com/c1241_toyota.html